Why cucumbers turn yellow in a greenhouse is explained by five factors of violation during care:

nutritional deficiency

Rational nutrition of the soil at the time of digging in spring and autumn will enrich it with minerals. It is enough to add rotted manure, ash, superphosphates and fertilizers rich in potassium. Only the lack of these minerals leads to the fact that at first they brighten, then yellowing appears. This deficiency also affects the fruits themselves - they begin to curl.

Lack of heat

Low night temperatures are one of the primary reasons why cucumbers turn yellow in a greenhouse. Cucumbers are heat-loving plants that react very sharply to temperature changes. This happens especially often in central Russia, when the last frosts attack at night. To prevent this from happening, it is necessary to insulate both the greenhouse itself, covering it with a film, and the plant itself, placing containers with water next to the seedlings. The water must be hot enough, because the temperature for the favorable growth of cucumbers must be at least + 22 ° C.

Lack of water and low humidity

The plant gives a signal that it lacks moisture by twisting and yellowing leaves. With insufficient watering, the roots take moisture from the stem and leaves, so the cucumbers turn yellow in the greenhouse. In this case, it must be remembered that for active fruiting, watering twice a week is needed. For one plant, 25 liters will be enough. warm water, and it will delight you with tasty and juicy fruits.

Excess ovaries

To form a whip, it is necessary to pinch in a timely manner and remove the ovaries if there are more than 20 of them on one fruiting plant. An excess of ovaries will also be the reason when cucumbers turn yellow and have an irregular shape in the greenhouse.

Pests and diseases

Powdery mildew may appear after watering cold water. The leaves begin to lighten and fade, spraying with a manganese solution and a mullein solution will serve as an ambulance.

In case of damage by root dust, the soil must be fertilized with chalk, ash and crushed coal. Plants whose roots are already affected by the disease must be removed along with the affected soil, in order to avoid further dissemination to healthy roots.

The spider mite primarily affects inside, yellowing of the site occurs, and then the entire sheet. A warm environment in a greenhouse is a favorable atmosphere for tick reproduction, therefore, in order to prevent subsequent damage to plants, they must be decontaminated special tool"Akarin" or "Fitoverm".

One of the most dangerous enemies of the cucumber is the greenhouse whitefly, which can feed on the juice of leaves and stems. Frequent weeding will partially eliminate this problem, due to which the cucumbers in the greenhouse also turn yellow, because the whitefly passes from the weeds to the fruit-bearing plant. When ventilating the greenhouse, the opening should be closed as much as possible with a breathable mesh. Spraying with water should be done as often as possible and do not forget to loosen the soil, apply fertilizer in the form of rotted sawdust, peat and humus.

The reason for the appearance of aphids on the plant is the same as in the previous case - the presence of weeds. In addition to thorough weeding and loosening the soil of the greenhouse, it is regularly necessary to spray the lashes with soapy water and tobacco infusion.

In order to avoid questions about why cucumbers turn yellow in a greenhouse, it is necessary to take into account all of the above factors that affect the quality and fertility of this plant.

Quite a few vegetable growers grow cucumbers in a polycarbonate greenhouse. At the same time, many of them are faced with the problem that the leaves of cucumbers turn yellow. Before processing cucumbers, you need to decide why the cucumber leaves turn yellow in the greenhouse and watch a video that describes how to solve this problem. This is the only way to get rid of yellowed foliage and protect the plant.

There are various reasons for the yellowing of leaves in cucumbers that are grown in greenhouse conditions. It is recommended that you familiarize yourself with them in advance in order to better understand how to deal with yellow sheets in the future.

Wrong watering

Quite often, the leaves on the bushes turn yellow in the greenhouse due to improper watering. It's no secret that cucumbers are moisture-loving vegetables, but this does not mean that they need to be watered very often. Particular attention should be paid to watering before fruiting. During this period, soil moisture should not be too high. It is because of the large amount of moisture that yellowing of the leaves may appear.

Another reason why the edges of the leaves turn yellow is watering with too cold water. If the temperature of the liquid is below room temperature, then the leaves of the cucumber seedlings will begin to dry out.

A considerable number of vegetable growers grow cucumbers in open field. In this case, it is necessary to pour water under the stem. Spraying bushes under the sun can cause burns on the leaves. Cucumber seedlings should be watered early in the morning or in the evening so that there is no sun.

Bad light

Sometimes the leaves turn yellow around the edges due to the fact that they are grown in rooms with insufficient light. Poor lighting not only causes the leaves to dry out, but also negatively affects the overall growth and development of the bushes.

There are cases when the seedling leaves turn yellow at the edges due to the large amount of light. Most often this happens in the summer, when the sun can not only warm the plant, but also burn it.

Unstable temperature

Not a single gardener is immune from sudden temperature changes. That is why, cucumber leaves turn yellow and dry due to unstable temperature regime. Even a greenhouse is not protected from such a problem, since due to night frosts, the temperature in the greenhouse can drop sharply.

To eliminate yellow leaves, you need to take care of additional protection cucumbers at night. For example, they can be covered with special materials, which include spunbond or agrotex.

Also, in cucumbers in a greenhouse, the edges of the leaves turn yellow due to low soil temperatures. It is recommended to grow bushes in soil that is warmed up to 20-25 degrees. At lower rates, the likelihood of drying sheets increases several times.

Soil composition

Problems with cucumber leaves can appear due to the poor quality of the soil in which they are grown. During the cultivation of cucumber, it is recommended to use moist and loose soils that pass water well. It is also worth taking care of the nutrients that many plants need. If their number is not balanced, then the leaves may become covered with yellowish spots.

Most often, an imbalance of minerals appears due to very frequent watering, which can wash out all the important components from the soil.
Poor pollination
Another reason why the leaves may start to turn yellow is poor pollination. This problem is most often found in plants that are grown in greenhouse conditions. To prevent the leaves from drying out, you need to periodically ventilate the greenhouse. This will allow insects to get inside and pollinate the bushes. Also, for the formation of ovaries, you can use such a tool as Ovary or Bud.
Diseases
Sometimes yellow leaves appear on cucumber bushes due to various diseases. Most often, this vegetable suffers from bacteriosis, tobacco mosaic, ascochitosis or peronosporosis. So that these diseases do not harm cucumbers, it is necessary to take care of their prevention. To do this, all plants should be pre-treated with special biological preparations that are absolutely harmless to animals and people.
If the plant has already become infected and its lower leaves turn yellow, then the yellowed foliage is treated with a Bordeaux mixture. Bushes affected by bacteriosis or mosaic are not treated and therefore must be disposed of immediately.

Pests
Quite often, mites and other insects are the reason cucumbers turn yellow. During the cultivation of cucumbers, it is recommended to take preventive measures that would protect the bushes from certain pests. To do this, you need to regularly treat plants with Funafon, Aktellik and Aktara.
Ways to fight
Having decided on why the leaves of cucumbers turn yellow, you need to familiarize yourself with what methods are used to deal with such a problem. This is the only way to find out what to do if the cucumber leaves turn yellow in the greenhouse. Various preparations are used to combat yellow leaves.
Aktara
This tool belongs to the group of neonicotinoids, which are used to combat many pests. Therefore, it is recommended to use it if the plant has turned yellow due to pests.
Aktara is applied immediately after the appearance of the first insects on the bushes. To do this, you need to prepare a working solution consisting of a liter of water and 20-30 ml of the drug. It is recommended to use the mixture in the evening hours and in the morning, when there is still no strong wind and sun outside. In windy weather, the drug should not be used so that it does not accidentally get on other plants.
The tool is very effective, because literally half an hour after its use, insects stop eating and begin to gradually die.

Magic Capsule
If the leaves turn yellow due to decay products that have accumulated in the soil, then you should use the Magic Capsule. With its help, you can restore the ecosystem of the soil and cleanse it of various poisonous elements. The composition of the drug includes a large amount of nitrogen, which can accelerate the growth of bushes several times. Also, this tool is often used to treat weak and thin seedlings.
To prepare the solution, one capsule is diluted in 40-50 liters of water. In this case, the prepared mixture should brew a little. It is necessary to water the bushes with liquid 2-3 times a week until the soil ecosystem is completely restored.
Clonex
If the edge of the leaves began to turn yellow, you should use Clonex. With it, you can not only protect the bushes from diseases and pests, but also strengthen the tips of the leaves. All this is possible due to the fact that the preparation contains quite a lot of vitamins and other useful components. You need to use the drug once a week.

Gliocladin
Glyocladin is used if cucumbers turn yellow due to fungal infections. It was released specifically to fight pathogens of fungal diseases on cucumbers and other plants. To prepare the working mixture, one tablet must be dissolved in a liter of water. The resulting solution is added under each bush that needs processing.
Maksim
To protect cucumbers from diseases and insects, you can use the fungicide Maxim. This drug is one of the most effective means in the fight against late blight, rhizoctoniosis and other diseases that may be accompanied by yellowing of leaves in cucumbers. This fungicide is universal, as it can be used to treat almost all plants.
Before using it, it is necessary to prepare the working mixture. To do this, 4 ml of the drug is mixed with two liters of water, after which the liquid is infused for 30-40 minutes. After that, the mixture can be used to spray the bushes.
Folk remedies
Also, to combat the yellowing of foliage, many use various folk remedies.
Pepper
Many folk remedies are prepared from various vegetables. In this case, the main ingredient for preparing the mixture is capsicum. 40 g of vegetable and 150 g of tobacco dust are mixed with a bucket of boiled water. Then the liquid is infused for 12 hours and filtered. After that, wood ash with liquid soap is added to it. The resulting mixture is very effective against mites or aphids.
Baguette
Some vegetable growers even use a bread loaf to combat yellow leaves. From it you can make a mixture that will help get rid of fungal infections. To prepare the solution, a loaf of gray bread needs to be soaked for a day in 10 liters of water. In the morning, a little iodine is added to the liquid container. The mixture is thoroughly mixed and distributed into liter jars. Before spraying, one jar of liquid must be added to a bucket of water, mixed and used to treat the bushes.
Milk serum
This mixture is very effective in fighting fungal diseases that can harm cucumber leaves. It is recommended to use it immediately after the first signs of the disease appear. To prepare a working solution, you need to add 2-4 liters of whey to 10 liters of water. All this is thoroughly stirred and infused for half an hour. Then 100 g of sugar is poured into the liquid, which is needed to improve the formation of new ovaries.
Conclusion
Many do not know what to do when the leaves turn yellow on the cucumbers in the greenhouse. To do this, you need to familiarize yourself with the causes of this problem and see the photo and video, which describes in detail the process of processing cucumbers.

Cucumber leaves dry - what's the problem? I think some kind of disease.

What to do if the leaves of cucumber seedlings dry?

May indicate that the plant has been attacked by pests. So, for example, a similar ailment is observed when exposed to the leaves of an aphid plant, an insect that is often introduced with planting containers and soil. After the aphids attack them, the leaves dry up, curl, the plant slowly dies. Processing cucumbers with infusion of garlic, actellic solution will help eliminate these pests.

, may be due to insufficient or, conversely, excessive content of minerals in the soil. So, nitrogen is of the greatest importance for the full growth of cucumbers. An insufficient content of this mineral provokes yellowing of the leaves and their subsequent fall, while an excess of nitrogen promises the appearance of pigmentation on the leaves.

fungal diseases (fusarium wilt of cucumber or white rot) - it is necessary to resort to the help of chemicals such as "Photosporin", "Kornevin", "Gitrauxin";
Having determined the reason why the withering of cucumber leaves began, measures should be taken to save the plant, since such a condition can lead to its death.
Diseases and pest infestations:
Incorrectly chosen location - if the direct rays of the sun fall on the leaves of the cucumber, then most likely they will begin to fade very quickly. Of great importance is the shape of the beds on which this crop is planted - too narrow and high lead to the loss of the necessary moisture, which leads to withering of the leaves and stem;

Also, the reason that cucumbers on the windowsill dry leaves may be root rot - fungal disease. Rotting of the roots leads first to the drying of the leaves, and then to the complete death of the plant. To prevent this from happening, you need to observe the temperature regime for the soil, water it with water at room temperature, and prevent waterlogging or overdrying of the earth. If the rot could not be avoided, you need to pour the earth into the container so that additional adventitious roots form.

To solve the problem, you need to follow all the requirements for growing seedlings. In the case of pests, you need to transplant seedlings in new land or pour (spray) with appropriate preparations.

Soddy land humus or compost (1: 1) with the addition of wood ash, superphosphate and potassium sulfate;

Why do indoor cucumbers dry leaves?

Cucumbers are a crop that almost every gardener grows on his plot. Someone prefers to immediately sow the seeds in open ground in prepared holes, while someone diligently grows seedlings on the windowsill and only after that they plant them in the ground. And already at this stage, sometimes you have to deal with the fact that for some reason the leaves of cucumber seedlings dry.

Please tell me why cucumber leaves turn yellow?

Yellowing of the leaves is also observed when the plant is exposed to a sprout fly - an insect that, when it penetrates the seeds or stems, causes their death. When larvae of sprout flies are found, it is necessary to completely replace the soil. Dry the leaves Also, yellowing of the leaves may be due to a deficiency of magnesium, calcium or potassium. To solve this problem, it is necessary to provide the plant with soil suitable for it, equipped with useful components, for example, old sawdust, humus, soddy soil and peat taken in equal proportions will help.

Ticks - spray with infusion of onion peel.

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Why do cucumber leaves wither?

If the cause is insufficient watering, then it is necessary to start watering the bushes often and in large quantities as soon as possible so that the moisture reaches the roots of the plant. In this case, you need to ensure that the water does not spread, but remains around the stem. To do this, the bed must be flat or you can even make it a small funnel.

Why do cucumber leaves wither?

Fungal disease - Fusarium wilt of cucumber, affecting greenhouse plants. It can be distinguished by a withered crown, accompanied by stem rot in the root zone;

Oversaturation or lack of fertilizers;
- Cucumbers are one of the most popular vegetables that are eaten throughout the year, so they are grown both in greenhouses and in the open field in almost every garden plot. But sometimes, despite the fact that the gardener follows all the recommendations, for some reason the cucumber leaves wither. Let's identify the main causes of this problem.
- If you, in order to harvest, without leaving your home, grow cucumbers on the windowsill and suddenly notice that their leaves are drying, you need to urgently take measures to save the plants.
- Peat, humus, sawdust, sand, mullein (6:1:1:1:1);
- It is rather unpleasant to face this at the very beginning of the journey, especially if the time for planting seedlings is running out and there is no time to grow new seedlings. You can try to cope with the situation and save the crumbs.
- Also interested in this question. And watering, and top dressing - everything is there, and they are brats playing on their nerves.
- cucumbers on the windowsill
Yellowing of the leaves of cucumbers may be due to improper watering, and both excess and insufficient soil moisture can cause a plant ailment. It is important to water cucumbers only with settled water at room temperature; watering should be regular; it is necessary that water enters both the superficial roots and the deep ones, while not flooding the plant. To avoid these problems, you should pickle the seeds in advance, cultivate the soil before planting, and also periodically spray cucumber lashes from a spray bottle with a weak solution of potassium permanganate. Before planting a cucumber in your garden plot, you should definitely familiarize yourself with the possible problems in growing it and how to eliminate them.
If pesticides get on the leaves, this fertilizer should be washed off from them as soon as possible, together with water they will be absorbed deep into the soil and will not be dangerous for the cucumber.
- White rot - the leaves lose their turgor, become completely soft, and then completely fall off, brown spots form in the root zone;
- Hit of herbicides - since this plant does not tolerate them at all;
- Gardeners have identified such main reasons why cucumber leaves wither:
- Some pests can lead to diseases of indoor cucumbers. For example, aphids, which are introduced along with the soil and planting pots. The leaves damaged by this insect dry, curl, flowers fall off and the whole plant gradually dies. As soon as you notice aphids on your plants, spray them with actellik, intravir, fosbecid or garlic infusion.
- Soddy land, peat, humus, stale sawdust (1:1:1:1).
If the seedlings are generally weak and frail, with dry tips, this may mean that the seeds were initially poor and of poor quality. In this case, unfortunately, you have to start all over again. Nothing worthwhile will come of such seedlings. Hurry up to reseed cucumbers, only when buying new seeds make sure that they are good and will not let you down again.

What to do if green leaves wither on cucumbers?

I don’t have such a problem yet, but with my neighbors in the country I saw how the leaves begin to turn yellow along the edges and dry out. I would like to know the reason and prevent it in time.

May be due to the development of root rot - fungal disease leading to decay of the root system and death of the plant.

Excess moisture or watering with cold water can provoke rotting of the roots of the plant, resulting in yellowing of the leaves and their death. In no case do not neglect this.

Non-observance of growing conditions:

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Why do cucumber leaves dry on the windowsill

The sprout fly can harm the plant - a gray insect with a stripe on the abdomen, the larvae are white. They winter in

It's all about the soil

It is likely that your seedlings did not fit the soil or did not have enough nutrients in it. Try to change it by carefully transplanting the sprouts. The second reason is unsuitable land. There are several options for the composition of the soil for cucumbers: I think it's all about the weather. It is hot during the day and cold at night, and the leaves of cucumbers “work” around the clock. In our village, everyone has such a problem.

Among other factors that cause yellowing of leaves in cucumbers are violations of the temperature regime, bad light, low air humidity, the presence of a draft.

Wrong watering

Yellowing leaves of cucumbers grown

Yellowing leaves in cucumbers grown

Diseases and pests

Root rot - spray with Trichodermin, which is oat grains covered with dry green mold. They are soaked and the diseased plant is processed with the resulting solution; Aphid - you can find it on the back of the sheets;Weather conditions

watering - insufficient moisture leads to the fact that the leaves begin to dry from the edge to the center, and moisture should also be avoided; soil and then penetrate the seeds and stems of seedlings, leading to their death. Before planting seeds, you need to disinfect the soil, and if larvae are found during the growth process, the soil must be completely replaced. Also, the cause of dry leaves may not be proper watering. Moreover, both insufficient and excessive levels of soil moisture can harm. Among other reasons why the ends of the leaves dry and do not grow in cucumbers are non-compliance with the temperature regime, insufficient air humidity, insufficient lighting, the presence of a draft, as well as pests in the soil and on the leaves.

Other reasons

Peat, humus, rotted sawdust (2:2:1) with the addition of wood ash, urea, superphosphate and potassium sulfate;

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Why do cucumber leaves turn yellow and dry?

Thank you very much!!!

We receive a lot of questions from our subscribers about problems with cucumbers. Here are some of them:

on the windowsill

Galina, Tver

on the windowsill

vladimir, Settlement (Penza region)

Aphids - a soap solution helps very effectively or you can buy special chemicals, for example, "Spark";

Ticks

- This delicate plant is very sensitive, therefore it reacts to a sharp cold snap.

7dach.ru

small distance between landings;

All gardeners face the annoying problem of prematurely yellowing leaves, fruits or ovaries on cucumbers - both when growing crops in open ground and when growing in a greenhouse. There are several reasons for this phenomenon, and in order to prevent crop loss, it is necessary to study each of them. About why cucumbers turn yellow and dry, we will try to tell in this article.

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Why do cucumbers turn yellow in a greenhouse

Why do cucumber leaves turn yellow in a greenhouse?

Very often, readers ask what to do if the cucumber leaves turn yellow in the greenhouse. First you need to find out why this is happening, since cucumbers in a greenhouse turn yellow leaves for at least five reasons:

violation of the rules of watering - lack or excess of moisture, watering plants with cold water, falling drops on the leaves during watering;
insufficient lighting - from this, as a rule, the lower leaves of plants turn yellow, but there is no particular reason to worry about this natural phenomenon;
lack of nutrients in the soil - nitrogen, magnesium, potassium, manganese, iron, copper, or, conversely, oversaturation of the soil with fertilizers;
damage to plants by diseases, for example, powdery mildew, fusarium wilt, root rot or downy mildew;
the presence of pests on cucumbers - melon aphids, whiteflies or spider mites.

Why do the ovaries of cucumbers turn yellow in the greenhouse

Why do cucumber buds turn yellow? If you find that the ovaries of cucumbers have begun to turn yellow, check if one of these phenomena has occurred in the greenhouse:

due to insufficient pollination, poor-quality ovaries formed on cucumbers - this is usually caused by growing artificially pollinated varieties in the absence of pollinating insects;
cucumbers are overloaded with too many embryos and cannot provide them with normal development - the formation of a large number of ovaries is an integral property hybrid varieties, which are intended for growing in a greenhouse;
cucumbers are affected by pests or diseases - fusarium, peronosporosis, rot, melon aphids or spider mites;
plants fell under frost or there was a sharp temperature drop - plants are not immune from this even in a greenhouse;
the balance of nutrients is disturbed in the soil - they are lacking or, conversely, there are too many of them;
violated the rules for watering cucumbers.

Why do cucumber fruits turn yellow in a greenhouse?

Cucumber fruits for almost the same reasons as leaves and ovaries, namely:

due to insufficient watering and violation of the temperature regime - cold water when watering, drafts or a sharp cold snap;
imbalance of nutrients in the soil;
cucumbers turn yellow and when fully ripe - this is a normal process. You can’t eat such a cucumber, but you can leave it for seeds.

Why cucumbers turn yellow in the open field

Why do the leaves of cucumbers turn yellow in the open field

Those who grow cucumbers in the open field may also have problems associated with a change in the color of the leaves - yellowing.

Why do cucumber leaves turn yellow in open ground? Some of the reasons for this phenomenon are of the same nature as those of cucumbers in a greenhouse. For example, insufficient or excessive watering of plants. If the plants do not have enough moisture, the leaves lose turgor and begin to turn yellow, and if you water the cucumbers too often and abundantly, their roots begin to rot, and the leaves turn yellow, respectively. In addition, if you water cucumbers at the very solar time days, water drops that fall on the leaves work like lenses, and burns occur in their place.

It is possible that cucumbers simply burn out in too strong a sun, especially during the hot afternoon hours.

The leaves of cucumbers also turn yellow when they grow too densely, because the plants do not have enough food area. Another reason for the phenomenon may be the low concentration of minerals in the soil.

Sometimes cucumbers suffer from an invasion of sucking insects that feed on the juice of their leaves - punctures first appear from their bites, and then yellowness.

Why do the ovaries of cucumbers turn yellow in the open field

The reasons for the yellowing of the embryos of cucumbers in the open field are almost the same as in the greenhouse:

violation of growing conditions - the rules of irrigation and lighting;
lack of nutrients;
difficulties with pollination;
too many ovaries;
a sharp temperature drop;
dense planting or improper formation of bushes;
diseases or pests.

Why do the fruits of cucumbers turn yellow in the open field

The reasons for yellowing cucumbers in the open field can be as follows:

lack of water;
lack of oxygen - air stops flowing to the roots of plants;
infection - peronosporosis, fusarium wilt or another disease.

Cucumbers turn yellow - how to fight

Fighting yellowing cucumbers

How to deal with such phenomena as yellowing of cucumber leaves, embryos and fruits? Let's analyze each reason separately.

Irrigation violation. Cucumbers are very moisture-loving, and they react painfully to lack of water. However, excessive watering can lead to the same problem - yellowing.

When growing cucumbers, it must be taken into account that before fruiting, the soil moisture, open or protected, should be lower than during fruit growth, and during the mass ripening of greens, the soil should be as saturated with moisture as possible. Categorically it is impossible to water cucumbers with cold water - this leads to yellowing and falling of the ovaries. Water must be poured under the stem so that drops do not fall on the leaves and fruits, since burns can form in these places.

Best time to moisten the soil in the beds with cucumbers - early morning or evening. Ground cucumbers are usually watered three times a week, and during the dry season daily, in greenhouses, due to the higher temperature, the plants are watered 4-5 times a week.

Insufficient lighting. The lack of light has a detrimental effect on the growth and development of cucumbers, therefore, when installing a greenhouse or choosing a site in a garden, one should take into account the extreme dependence of the culture on this factor. In addition, when planting seedlings or sowing seeds of cucumbers, it is necessary to follow the recommended scheme so that each plant has enough nutritional area for growth and development and the maximum amount of sunlight.

For example, parthenocarpic varieties and hybrids are planted one per m², and bee-pollinated - 2-3 bushes per m². If you save space by planting seedlings too closely, grown plants will shade each other, and as a result, their leaves and ovaries will begin to turn yellow and fall off.

But be prepared and protect your cucumbers from too much light, especially when a lingering dry heat sets in, because the summer sun can not only warm, but also burn.

Then you need to pinch the shoots as they grow. If this is not done in a timely manner, they will grow, and the bushes will begin to shade each other. To prevent this from happening, the upper part of the shoots is pinched after growing by 20 cm, because longer shoots weaken the plant and lead to yellowing of the ovaries.

Temperature violation. No gardener is immune from sudden changes in temperature or sudden frosts, even when it comes to growing cucumbers in protected ground. For example, film-covered greenhouses allow heat to pass through during the day, and the air inside can even heat up to 40 ºC, but at night the film releases heat, which causes the temperature in the greenhouse to drop sharply. Here is the reason for yellowing and even falling of the ovaries. To avoid temperature fluctuations, it is necessary to provide additional shelter for cucumbers at night with a film or non-woven covering material - agrotex, lutrasil or spunbond.

The optimal temperature for parthenocarpic cucumbers before fruiting is considered:

in clear weather - 22-24 ºC;
in cloudy weather 20-22 ºC;
at night 17-18 ºC.

During the fruiting period, the temperature is maintained within the following limits:

23-26 ºC in clear weather;
21-23 ºC on cloudy days;
18-20 ºC at night.

For growing bee-pollinated varieties, temperature indicators should be 1-3 degrees higher than for parthenocarpic ones.

As for the soil temperature, the most comfortable range for cucumbers will be from 22 to 24 ºC, and the critical mark of the thermometer is 13-15 ºC - if the temperature drops below, the roots will stop absorbing nutrients, and the cucumber ovaries will begin to turn yellow and fall off.

Violation of mineral nutrition. Soil composition. When choosing a site for cucumbers, it is also necessary to ensure soil quality suitable for the crop. The soil for cucumbers is preferably loose, moist, air and moisture permeable. As for nutrients, their amount in the soil must be balanced, otherwise the leaves and embryos of cucumbers will begin to turn yellow. And problems with an imbalance of minerals in the soil are very likely, since the abundant and frequent watering that cucumbers require, potassium, nitrogen and other elements important for the plant are washed out of the soil.

How to determine which mineral is lacking in plants? By outward signs: for example, yellow spots on the leaves indicate a lack of potassium, discolored and yellowing leaves, thinned lashes are symptoms of a lack of nitrogen, yellow edging on the lower leaves of cucumbers indicates a magnesium deficiency, yellowing young leaves indicate that plants need copper, yellow spots and bright green veins on the leaves indicate a lack of iron, and from a lack of zinc, the edges of cucumber leaves turn yellow, and the lower leaves die off.

Therefore, regular feeding of cucumbers with nitrogen-potassium-phosphorus fertilizers is necessary, especially during the fruiting period, as well as treatment of plants by leaves with solutions containing other important elements. A simple but effective dressing for cucumbers is herbal infusion.

Poor pollination of cucumbers in the greenhouse. When choosing varieties of cucumbers for growing in a greenhouse, give preference to parthenocarpic and self-pollinating ones - those that do not need pollinating insects. If you are growing bee-pollinated varieties, then plant honey plants in the greenhouse to attract bees and arrange daytime ventilation so that insects can enter the greenhouse. For the formation of full-fledged ovaries, spraying cucumbers with a solution is effective. boric acid and drugs Bud or Ovary.

Sometimes cucumbers form too many ovaries. In this case, you need to carry out immediate pinching or simply remove the extra embryos - there should be no more than 30 of them on one bush, otherwise the ovaries will begin to turn yellow and crumble, and the plant will waste nutrients on them.

Cucumber diseases. When growing cucumbers, it is necessary to observe crop rotation - do not plant a crop in the area after pumpkins - and take preventive measures against infection of plants with diseases such as root rot, Fusarium wilt, pitiosis, peronosporosis, ascochitosis, tobacco mosaic and bacteriosis.

A preventive measure is the treatment of cucumbers with the biological preparation Trichodermin, which is harmless to humans and animals, but suppresses pathogenic fungi. But if you still find symptoms of a fungal disease on cucumbers, spray the plants with one percent Bordeaux liquid. Unfortunately, infections of viral origin - mosaic or bacteriosis, for example - are incurable, so you need to remove the affected specimens from the garden as soon as possible and treat the soil in which they grew with a five percent formalin solution.

Cucumber pests. Most often, cucumbers suffer from melon aphids, whiteflies and spider mites, which feed on the cell sap of the leaves. As a preventive measure against pests, we recommend that you regularly destroy weeds during the growing season and plant debris after it. When mass destruction cucumbers with insects will have to be treated with insecticides Aktara, Actellik or Fufanon, but it is better not to resort to such strong and unsafe drugs, but to use folk remedies against pests.

Cucumbers turn yellow - folk remedies

In order not to endanger your health, you can use the following infusions and solutions to kill insects:

30-40 g of chopped fresh hot peppers (or 10 g of dry), mixed with 200 g of tobacco dust, poured into a bucket hot water, insist for a day, filter, add 2 tablespoons liquid soap and wood ash, mix well and treat cucumbers with this composition from aphids or spider mites. Repeat the treatment in a week;
a full glass of wood ash with a slide is stirred in a bucket of hot water, insisted for a day, then filtered and 2 tablespoons of liquid soap are added;
150-170 g of crushed garlic cloves are poured with a liter of water, tightly closed and infused for five days. 60 g of this concentrate is poured into a bucket of water, stirred and treated with a solution of cucumbers from whiteflies;
whiteflies can be washed off cucumbers clean water, after which the soil under the bushes should be well loosened;
4 kg of fresh or 2 kg of dried potato tops are poured into 10 liters of hot water, insisted for 3-4 hours, filtered, 40 g of liquid soap are added and cucumbers are sprayed from ticks and aphids.

In order not to use fungicides toxic to humans, the following folk remedies can be used in the fight against fungal diseases of cucumbers:

20 g grated laundry soap, a liter of skimmed milk and 30 drops of iodine are mixed with 10 liters of water and cucumbers are processed in the phase of formation of 3-4 leaves, and then every 10 days;
soak a gray bread loaf in 10 liters of water for 12 hours, knead it well in the morning, add a medicine bottle of iodine to a bucket of water and bread and mix thoroughly. Add a liter of the resulting bread-iodine solution to a bucket of clean water and treat the cucumbers from fungal infections. Re-treat in two weeks;
pathogenic fungi do not like alkali - in 10 liters of water you need to dilute one tablespoon of soda ash and treat cucumbers with a solution in June;
half a bucket of onion peel should be poured with a bucket of water, brought to a boil, insisted for half a day, strained, squeezing the peel, diluted with water in a ratio of 2: 8 and sprayed with cucumbers and the soil under them;
as soon as you notice the first signs of a fungal disease, treat the cucumbers with this composition: mix 2 liters of whey or low-fat kefir in 10 liters of water. If you add 150 g of sugar to the solution, this will contribute to a better formation of ovaries;
against downy mildew, or peronosporosis, such a solution is effective: pour 3 liters of whey and one teaspoon of copper sulfate into 7 liters of water, mix thoroughly and spray cucumbers.

At the end of the growing season, when you remove all the greens from the cucumbers, treat the plant residues and soil on the beds with a solution of 50 g of copper sulfate in 5 liters of water, and the next day remove the tops from the site and burn it.

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After this article, they usually read

- violation of the rules of watering - lack or excess of moisture, watering plants with cold water, falling drops on the leaves during watering;
- insufficient lighting - from this, as a rule, the lower leaves of plants turn yellow, but there is no particular reason to worry about this natural phenomenon;
- lack of nutrients in the soil - nitrogen, magnesium, potassium, manganese, iron, copper, or, conversely, oversaturation of the soil with fertilizers;
- damage to plants by diseases, for example, powdery mildew, fusarium wilt, root rot or downy mildew;
- the presence of pests on cucumbers - melon aphids, whiteflies or spider mites.

Why cucumbers dry in the open field and greenhouse

Why do the ovaries of cucumbers turn yellow in the greenhouse.

Why do cucumber buds turn yellow? If you find that the ovaries of cucumbers have begun to turn yellow, check if one of these phenomena has occurred in the greenhouse:

- due to insufficient pollination, poor-quality ovaries formed on cucumbers - this is usually caused by growing artificially pollinated varieties in the absence of pollinating insects;
- cucumbers are overloaded with too many embryos and cannot provide them with normal development - the formation of a large number of ovaries is an integral property of hybrid varieties that are intended for growing in a greenhouse;
- cucumbers are affected by pests or diseases - fusarium, peronosporosis, rot, gourd aphids or spider mites;
- the plants fell under frost or there was a sharp temperature drop - plants are not immune from this even in a greenhouse;
- the balance of nutrients is disturbed in the soil - they are lacking or, conversely, there are too many of them;
- violated the rules for watering cucumbers.

Growing cucumbers in a greenhouse - planting and care

Why do cucumber fruits turn yellow in a greenhouse.

Cucumber fruits for almost the same reasons as leaves and ovaries, namely:

- due to insufficient watering and violation of the temperature regime - cold water during irrigation, drafts or a sharp cold snap;
– imbalance of nutrients in the soil;
- cucumbers turn yellow and when fully ripe - this is a normal process. You can’t eat such a cucumber, but you can leave it for seeds.

Why cucumbers turn yellow in the open field

Why do the leaves of cucumbers turn yellow in the open field.

Those who grow cucumbers in the open field may also have problems associated with a change in the color of the leaves - yellowing. Why do cucumber leaves turn yellow in open ground? Some of the reasons for this phenomenon are of the same nature as those of cucumbers in a greenhouse. For example, insufficient or excessive watering of plants. If the plants do not have enough moisture, the leaves lose turgor and begin to turn yellow, and if you water the cucumbers too often and abundantly, their roots begin to rot, and the leaves turn yellow, respectively. In addition, if you water cucumbers during the sunniest time of the day, water drops that fall on the leaves work like lenses, and burns occur in their place.

It is possible that cucumbers simply burn out in too strong a sun, especially during the hot afternoon hours.

Cultivation of cucumbers in open ground - planting and care

Sometimes cucumbers suffer from an invasion of sucking insects that feed on the juice of their leaves - punctures first appear from their bites, and then yellowness.

Why do the ovaries of cucumbers turn yellow in the open field.

The reasons for the yellowing of the embryos of cucumbers in the open field are almost the same as in the greenhouse:

- Violation of growing conditions - rules of watering and lighting;
- lack of nutrients;
– difficulties with pollination;
- too many ovaries;
- a sharp temperature drop;
- dense planting or improper formation of bushes;
- diseases or pests.

Why do the fruits of cucumbers turn yellow in the open field.

The reasons for yellowing cucumbers in the open field can be as follows:

- lack of water;
- lack of oxygen - air stops flowing to the roots of plants;
- infection - peronosporosis, fusarium wilt or other disease.

Cucumbers turn yellow - how to fight

Fight against yellowing of cucumbers.

How to deal with such phenomena as yellowing of cucumber leaves, embryos and fruits? Let's analyze each reason separately.

Irrigation violation. Cucumbers are very moisture-loving, and they react painfully to lack of water. However, excessive watering can lead to the same problem - yellowing. When growing cucumbers, it must be taken into account that before fruiting, the soil moisture, open or protected, should be lower than during fruit growth, and during the mass ripening of greens, the soil should be as saturated with moisture as possible. Categorically it is impossible to water cucumbers with cold water - this leads to yellowing and falling of the ovaries. Water must be poured under the stem so that drops do not fall on the leaves and fruits, since burns can form in these places. The best time to moisten the soil in cucumber beds is early morning or evening. Ground cucumbers are usually watered three times a week, and during the dry season daily, in greenhouses, due to the higher temperature, the plants are watered 4-5 times a week.

Insufficient lighting. The lack of light has a detrimental effect on the growth and development of cucumbers, therefore, when installing a greenhouse or choosing a site in a garden, one should take into account the extreme dependence of the culture on this factor. In addition, when planting seedlings or sowing seeds of cucumbers, it is necessary to follow the recommended scheme so that each plant has enough nutritional area for growth and development and the maximum amount of sunlight. For example, parthenocarpic varieties and hybrids are planted one per m², and bee-pollinated - 2-3 bushes per m². If you save space by planting seedlings too closely, grown plants will shade each other, and as a result, their leaves and ovaries will begin to turn yellow and fall off.

But be prepared and protect your cucumbers from too much light, especially when a lingering dry heat sets in, because the summer sun can not only warm, but also burn.

Growing seedlings of cucumbers at home

The ovaries of cucumbers also turn yellow from an irresponsible attitude to such a procedure as the formation of a bush. Cucumber bushes begin to form with "blinding" - the removal of rudimentary elements in the axils of the leaves. How many of them to remove on one plant depends on the variety of cucumbers: on bushes of a bee-pollinated variety, three sinuses blind, and on parthenocarpic cucumbers - at least eight. Then you need to pinch the shoots as they grow. If this is not done in a timely manner, they will grow, and the bushes will begin to shade each other. To prevent this from happening, the upper part of the shoots is pinched after growing by 20 cm, because longer shoots weaken the plant and lead to yellowing of the ovaries.

Temperature violation. No gardener is immune from sudden changes in temperature or sudden frosts, even when it comes to growing cucumbers in protected ground. For example, film-covered greenhouses allow heat to pass through during the day, and the air inside can even heat up to 40 ºC, but at night the film releases heat, which causes the temperature in the greenhouse to drop sharply. Here is the reason for yellowing and even falling of the ovaries. To avoid temperature fluctuations, it is necessary to provide additional shelter for cucumbers at night with a film or non-woven covering material - agrotex, lutrasil or spunbond.

The optimal temperature for parthenocarpic cucumbers before fruiting is considered:

- in clear weather - 22-24 ºC;
- in cloudy weather 20-22 ºC;
– at night 17-18 ºC.

During the fruiting period, the temperature is maintained within the following limits:

– 23-26 ºC in clear weather;
- 21-23 ºC on a cloudy day;
– 18-20 ºC at night.

For growing bee-pollinated varieties, temperature indicators should be 1-3 degrees higher than for parthenocarpic ones.

Violation of mineral nutrition. Soil composition. When choosing a site for cucumbers, it is also necessary to ensure soil quality suitable for the crop. The soil for cucumbers is preferably loose, moist, air and moisture permeable. As for nutrients, their amount in the soil must be balanced, otherwise the leaves and embryos of cucumbers will begin to turn yellow. And problems with an imbalance of minerals in the soil are very likely, since the abundant and frequent watering that cucumbers require, potassium, nitrogen and other elements important for the plant are washed out of the soil.

How to determine which mineral is lacking in plants? By external signs: for example, yellow spots on the leaves indicate a lack of potassium, discolored and yellowing leaves, thinned lashes are symptoms of a lack of nitrogen, yellow edging on the lower leaves of cucumbers indicates a magnesium deficiency, yellowing young leaves indicate that plants need copper, yellow spots and bright green veins on the leaves indicate a lack of iron, and from a lack of zinc, the edges of the cucumber leaves turn yellow, and the lower leaves die off. Therefore, regular feeding of cucumbers with nitrogen-potassium-phosphorus fertilizers is necessary, especially during the fruiting period, as well as treatment of plants by leaves with solutions containing other important elements. A simple but effective dressing for cucumbers is herbal infusion.

Poor pollination of cucumbers in the greenhouse. When choosing varieties of cucumbers for growing in a greenhouse, give preference to parthenocarpic and self-pollinating ones - those that do not need pollinating insects. If you are growing bee-pollinated varieties, then plant honey plants in the greenhouse to attract bees and arrange daytime ventilation so that insects can enter the greenhouse. For the formation of full-fledged ovaries, spraying cucumbers with a solution of boric acid and Bud or Ovary preparations is effective.

Cucumber diseases. When growing cucumbers, it is necessary to observe crop rotation - do not plant a crop in the area after pumpkins - and take preventive measures against infection of plants with diseases such as root rot, Fusarium wilt, pitiosis, peronosporosis, ascochitosis, tobacco mosaic and bacteriosis.

Cucumber pests. Most often, cucumbers suffer from melon aphids, whiteflies and spider mites, which feed on the cell sap of the leaves. As a preventive measure against pests, we recommend that you regularly destroy weeds during the growing season and plant debris after it. In the event of a massive infestation of cucumbers by insects, the plants will have to be treated with insecticides Aktara, Aktellik or Fufanon, but it is better not to resort to such strong and unsafe drugs, but to use folk remedies against pests.

Cucumbers turn yellow - folk remedies.

In order not to endanger your health, you can use the following infusions and solutions to kill insects:

- 30-40 g of chopped fresh hot peppers (or 10 g of dry), mixed with 200 g of tobacco dust, poured with a bucket of hot water, insisted for a day, filtered, add 2 tablespoons of liquid soap and wood ash, mix well and process cucumbers this composition from aphids or spider mites. Repeat the treatment in a week;
- a full glass of wood ash with a slide is stirred in a bucket of hot water, insisted for a day, then filtered and 2 tablespoons of liquid soap are added;
- 150-170 g of crushed garlic cloves are poured with a liter of water, tightly closed and infused for five days. 60 g of this concentrate is poured into a bucket of water, stirred and treated with a solution of cucumbers from whiteflies;
- whiteflies can be washed off cucumbers with clean water, after which the soil under the bushes should be well loosened;
- 4 kg of fresh or 2 kg of dried potato tops are poured into 10 liters of hot water, insisted for 3-4 hours, filtered, 40 g of liquid soap are added and cucumbers are sprayed from ticks and aphids.

In order not to use fungicides toxic to humans, the following folk remedies can be used in the fight against fungal diseases of cucumbers:

- 20 g of grated laundry soap, a liter of skim milk and 30 drops of iodine are mixed with 10 liters of water and cucumbers are treated in the formation phase of 3-4 leaves, and then every 10 days;
- soak a gray bread loaf in 10 liters of water for 12 hours, knead it well in the morning, add a medicine bottle of iodine to a bucket of water and bread and mix thoroughly. Add a liter of the resulting bread-iodine solution to a bucket of clean water and treat the cucumbers from fungal infections. Re-treat in two weeks;
- pathogenic fungi do not like alkali - in 10 liters of water you need to dilute one tablespoon of soda ash and treat cucumbers with a solution in June;
- half a bucket of onion peel should be poured with a bucket of water, brought to a boil, insisted for half a day, strained, squeezing the peel, diluted with water in a ratio of 2: 8 and sprayed with cucumbers and the soil under them;
- as soon as you notice the first signs of a fungal disease, treat the cucumbers with this composition: mix 2 liters of whey or low-fat kefir in 10 liters of water. If you add 150 g of sugar to the solution, this will contribute to a better formation of ovaries;
- against downy mildew, or peronosporosis, such a solution is effective: pour 3 liters of whey and one teaspoon of copper sulfate into 7 liters of water, mix thoroughly and spray the cucumbers.

floristics.info

Why do cucumber seedlings turn yellow and dry, in a greenhouse and in open ground: the most common reasons. What to do if cucumber leaves turn yellow?

Causes of yellowing cucumber leaves and how to treat them.

Growing cucumbers in a greenhouse is a rather painstaking process. With the right approach and following all the rules, you will be able to get excellent harvest. But in most cases, you have to fight to get a decent amount of fruit.

It is difficult to grow cucumbers in a greenhouse, as the plant is very capricious. The slightest errors in watering or a change in temperature immediately affect the condition of the seedlings.

Causes of yellowing and drying of leaves in seedlings of cucumbers:

Excessive, insufficient or incorrect watering. The most interesting thing is that the state of the plant is affected not only by the amount of moisture, but also by the frequency of watering.
Lack of light. In greenhouse conditions, seedlings should be illuminated using fluorescent lamps.
Lots of sun. Under direct sunlight, the plant quickly turns yellow. Therefore, on the south side, the plant needs to be shaded.
Lack of minerals. With a lack of nutrients, the plant dries and turns yellow.
Insects. Usually these are slugs or large insects that damage the root system.
Not enough space. When planting seeds, it is worth considering the amount of soil around the roots. Cucumbers love space and wither in pots with a small diameter.

Why do the leaves of cucumber seedlings turn yellow and dry?

Both in the greenhouse and in the open field, the leaves of cucumbers may turn yellow. The reason for this is the lack of moisture, insects and errors in care.

Causes of yellowing leaves in the greenhouse:

Insects. In the greenhouse, the plant can be affected by whiteflies, melon aphids and spider mites.
Wrong climatic conditions. It can be frequent and very plentiful watering. A decrease in temperature below 14 ° C negatively affects the state of the plant. The optimum temperature can be considered as 26 °C.
Powdery mildew. At the same time, the stems and leaves immediately become covered with a whitish coating. Over time, the leaves dry and turn yellow.
Fusarium. This is a fungal disease that blocks the supply of nutrients to the roots of the cucumber. It turns out that due to a lack of minerals, the leaves dry and wither.

Why do cucumber leaves turn yellow and dry in a greenhouse?

After transplanting seedlings of cucumbers into open ground, gardeners do not have less problems. The fact is that the plant is capricious and on the open ground it is even more difficult to ensure normal climatic conditions.

Causes of yellowing and drying of leaves in open ground:

Bad place. If you planted a plant in the place where melons, pumpkins or squash grew last year, then cucumbers will not grow well here. This is due to the depletion of the soil.
Abundant watering during the day. The plant should be watered in the evening. This is due to the fact that droplets of moisture that fall on the leaves heat them very much. This provokes the appearance of burns.
Densely planted plants. Cucumbers, like any other vegetable crop, need to be dived. If this is not done, then the leaves will not have enough light and they will turn yellow.
Diseases or insects. Both in greenhouse conditions and on the ground, plants can dry and turn yellow due to powdery mildew, slugs, aphids and spider mites.

Why do cucumber leaves turn yellow and dry in the ground?

What to do if cucumber leaves turn yellow?

There are many ways to deal with yellowing leaves. But in any case, it is better to resort to preventive measures.

There is a mass folk recipes, which help with yellowing of the leaves.

Folk recipes:

Bread. Soak a loaf of bread in water and grind the crumbs in a blender. You should get a sticky porridge. Enter it into half a bucket of water and pour in a bottle of iodine alcohol solution. Spray the plant with the mixture.
Onion peel. Pour a handful of onion peel with a liter of water and boil for 2-4 minutes. Let stand 12 hours and squeeze out the cake. Dilute with water to 5 liters and spray the leaves. Pour the rest of the product under the roots.
Serum. To prepare a solution for the purpose of spraying, 150 g of sugar are dissolved in 2 liters of whey. The resulting liquid is watered on the roots and sprayed on the leaves.
Potassium permanganate. At the first appearance of yellow spots, it is necessary to prepare a 1% solution of potassium permanganate and spray the leaves.
Soda. To prevent diseases caused by fungi, plants are watered with a weak solution of soda. For 1000 ml of water you need 20 g baking soda. Do not spray on the leaves.

Cucumber leaves turned yellow - what to do: folk remedies

As you can see, cucumbers are a capricious plant that requires careful care. The slightest error in care can lead to yellowing and wilting of the leaves.

VIDEO: Cucumber leaves turn yellow

heaclub.ru

It is difficult to imagine a garden without cucumbers. The culture has been cultivated by man for so long that breeders have achieved some success, making it hardy and resistant to a number of diseases. But even when growing such cultivars, gardeners face a number of problems. An exotic vegetable that came to us from India is rather capricious in terms of growing conditions and requires special attention. The problem that summer residents face most often is that cucumbers in a greenhouse turn yellow leaves, what should I do? You will find the answer to this question in the article. The material will tell you about the possible causes of discoloration, the dangers that lie in this and how to fix problems.

What is the danger of changing the color of cucumber foliage

The appearance of several yellow leaves in the cucumber crown often does not cause alarm for the gardener. Such a careless attitude can lead to the death of a culture.

Plants feed by absorbing solar energy and carbon dioxide. Chlorophyll is a special pigment that colors leaf blades in green color, helps to convert components into organic substances. This process is called photosynthesis. The reaction mechanism is possible only in the presence of light and chlorophyll. If the leaf blade of the plant changes color, then the amount of chlorophyll decreases, which leads to a lack of nutrition. The plant organism experiences "hunger", gradually depletes its reserves and dies.

Remember! Modern hybrids with high endurance are able to turn yellow in the same way as ordinary "grandmother's" varieties.

Causes of yellowing cucumber leaves in the greenhouse

Having found several yellow leaves in the crown of a cucumber, the gardener should think about what could cause such a behavior of a green pet. The main factors causing a change in leaf color:

diseases caused by the growth of mycelium of pathogenic fungi;
plant viral diseases;
pest attack;
lack of certain trace elements;
violation of the temperature regime when growing a crop;
violation of the balance of moisture in the soil;
lack of light;
root damage;
biological aging of the individual.

The described factors cause various changes in the color of the foliage. A careful examination will allow us to conclude what caused the cucumber bush to change color.

Spores of pathogenic fungi remain viable in the soil for a long time, and greenhouse conditions are ideal for the development of mycelium. To avoid infection, it is necessary to replace part of the substrate annually and disinfect it. If the bush is sick, it is treated with fungicidal solutions or folk remedies. You will learn more about ways to deal with fungal diseases in the corresponding section of the article.

Important! At the stage of formation of zelentsov, treatment with chemicals is unacceptable. Harmful substances accumulate in fruits, making them unfit for human consumption.

Among plant viruses for exotics, cucumber mosaic poses the greatest danger. The disease got its name because of the formation of a characteristic pattern on the foliage. Angular yellow spots indicate the course of the disease. If such a change in color is detected, urgently remove the sick individual from the garden and enter quarantine. Keep an eye on nearby bushes as the disease spreads quickly. Cucumber mosaic cannot be cured, but its appearance can be prevented by disinfecting seeds, soil, and greenhouses. Plant residues and infected specimens must be destroyed. It is better to burn the tops in a secluded corner of the garden.

Greenhouse conditions are suitable for pests. Insects rush to build a colony, endangering the entire crop. The danger to the vegetable is aphids, spider mites, whiteflies, slugs, and bears. The activity of aphids, whiteflies and spider mites is manifested by small yellow specks on the foliage, appearing in the places of suction of individuals. Pests feed on tissues and plant sap, depriving the leaf blade of chlorophyll.

Know! Although the bears prefer to eat root crops, when settling the site, these large insects dig holes, damaging the roots of other plants.

Detected insects are exterminated with insecticides, but folk remedies are preferable, because a vegetable stuffed with chemistry is not good for food. For prevention, carry out weeding, remove plant debris.

TO possible reasons the appearance of yellowness refers to a lack of fertilizer. Deficiency of each trace element manifests itself in different ways. Cucumbers are characterized by rapid development, so the need for seedlings in nitrogen is great. Already at the seedling stage, the first signs of nitrogen starvation appear - the loss of a typical green color, lightening of the plate, folding the edge down. Gradually, the leaf will begin to die off due to a lack of chlorophyll. With a lack of magnesium, yellow spots appear, to which brown spots are added. The foliage dries up, crumbles.

Potash hunger can jeopardize the crop. Without this trace element, normal formation of ovaries is impossible, flowering is weak. The foliage is torn with a yellowish edging, extending to the entire plate. The edges of the sheet appear burnt. Calcium deficiency is manifested by deformation of the plates, followed by yellowing and the formation of necrotic spots. If the soil for planting was fertilized in advance, and top dressing was made according to the schedule, your green ward will not “starve”. Otherwise, apply appropriate fertilizer.

Important! Violation of the agrotechnical rules for the cultivation of crops leads to backfire. Timely application of fertilizers will save cucumbers from "starvation".

Temperature and humidity play a huge role in growing an exotic vegetable. The native environment assumes a temperature background of 23-27⁰C and regular abundant watering. When it's hot outside, the temperature rises in the greenhouse. Overheating leads to a slowdown in the development of seedlings, and in combination with a lack of moisture in the soil, it threatens the death of the bushes.

At low air temperatures outside, the humidity in a closed room increases. This will lead to the activation of fungi, the appearance of root rot. Regular airing during the day will eliminate the greenhouse effect. A decrease in temperature below 14⁰C leads to a stop in the development of the culture, and the contact of foliage with cold surfaces causes the foliage to die due to hypothermia.

Proper watering is also important. The culture is watered so that the substrate is moistened to a depth of 10 cm. Mulch helps prevent rapid evaporation of the liquid. In addition to the regularity of irrigation, moisture should not be allowed to enter the foliage mass. Water droplets exposed to sunlight become very hot, causing burns.

Know! Another possible factor in the appearance of burns on the foliage is the ingress liquid dressings, herbicides.

Lack of light adversely affects the development of seedlings. Adult individuals tend to take care of the main function of living organisms - reproduction. To protect the ovaries and direct nutrition to their development, the bush sheds "ballast", getting rid of the lower leaves. Good illumination and rarefaction of plantings will help to avoid yellowing and loss of the lower tier of the crown. Too dense thickets also interfere with the normal ventilation of the root zone, provoking an increase in humidity and the development of root rot.

The exotic root system is sensitive to damage. Mechanical damage appears as a result of inaccurate transplanting of seedlings, deep loosening, and the activity of a bear. With root rot, it is almost impossible to save a bush, so it is very important to follow the rules of watering and not to thicken the plantings.

Cucumbers are seasonal annuals, so you should not be surprised at the yellowing of the foliage by the end of the season. This happens due to the aging of individuals.

Folk remedies to combat yellowing leaves

When yellow leaves appear, do not rush to grab chemicals. You can save the bush and folk remedies. This option is preferable, because chemicals cannot be used during the growth of greens. If the foliage turns yellow in spots, there is a picture of a fungal infection. We suggest that you familiarize yourself with the most effective means for emergency resuscitation of cucumber bushes.

Watering with soda solution

An alkaline environment prevents the development of mycelium, so timely watering with a solution of baking soda (in June) will destroy spores in the soil. Dissolve a tablespoon of the component in 10 liters of water.

Advice! Refine the composition by adding 40 ml vegetable oil and acetylsalicylic acid tablets. Use the spray mixture only early in the morning or late in the evening, otherwise sunburn cannot be avoided.

Spraying with dairy products

To prepare the composition, take:

10 liters of water;
25-30 ml of alcohol tincture of iodine;
a tablespoon of grated or liquid laundry soap;
a package of kefir or milk.

Stir the ingredients in water until the soap is completely dissolved. Soap is necessary for better adhesion of the mixture to the leaves. Preventive spraying should be carried out after transplanting seedlings or the development of the fourth leaf every 10 days.

Serum from the fungus

The causative agents of late blight and powdery mildew die from exposure to a serum solution. Two liters of fermented milk product per 10 liters of water will be enough to prepare a solution. Such a composition can be used at least every day, but in order not to provoke high humidity in greenhouse conditions it is better to limit yourself to 1-2 times a week.

Spraying with potassium permanganate

The disinfecting properties of a light pink solution of potassium permanganate are useful not only for humans. After spraying, the bush will not only get rid of the fungal infection, but also make up for the deficiency of trace elements.

Remember! In the manufacture of the drug, it is necessary to ensure that all the crystals of the substance dissolve, otherwise the sheet plate will receive a chemical burn.

Garlic-soap composition

Antibiotics for the health of cucumbers

Metronidazole is a drug for the treatment of a wide range of diseases caused by microbes and protozoa. An effective remedy for the development of fungi. Experienced gardeners recommend burying 1 tablet of metronidazole in the ground before planting or spraying by taking 2 tablets per liter jar of water. To disinfect the substrate, 5 tablets of the drug are dissolved in a bucket of water, watering is carried out.

Brilliant green against downy mildew

A composition based on urea, whey and brilliant green will help overcome the transference. Dissolve 10 ml of brilliant green in a bucket of water, add two liter packets of whey and 50 g of urea. Spray the mixture every 10 days.

On a note! The folk recipes described above will help not only make up for nutritional deficiencies, but also protect against fungal infections.

Why the ovaries of cucumbers (embryos) turn yellow in the greenhouse what to do

Sometimes, in greenhouse conditions, it is not the exotic crown that begins to turn yellow, but the ovaries. This phenomenon is observed in the following reasons:

violation of agricultural technology - a combination of illumination, moisture and temperature;
nutritional deficiency;
too high concentration of ovaries;
inadequate pollination.

Having found falling ovaries, pay attention to agricultural technology. Eliminate the lack of light, minerals, water correctly, maintain optimal temperature and humidity, inspect for pests, diseases. Bring the indicators back to normal, and a healthy look will return to the green ward.

If the bushes are grown in accordance with agricultural standards, and top dressing is applied regularly, the cause of yellowing and shedding of the ovaries lies in the excess of embryos. The more ovaries on the whip, the more plant spend resources on their development. It can be said that such a discharge of ballast is a natural process, but it is better not to allow unnecessary load by plucking out excess embryos. The correct formation of the whip also contributes to the normal development and prevention of yellowing of the ovary.

Advice! Leave no more than 25 greens on one lash, otherwise the cucumber will independently manage the resources.

One more thing should be mentioned important factor concerning the irrigation regime. During the fruiting period, it is necessary to moisten the soil more often, but watering with cold water will provoke the death of the embryos. In order for more female flowers to appear, experienced gardeners recommend drying the ground without irrigating for several days, after which water the bushes abundantly.

Unpollinated ovaries die because they become unviable. In the greenhouse, this phenomenon is observed more often than in the open field. The closed space does not allow insects to get inside and carry out pollination, and the heat inside does not attract bees to collect nectar. Cloudy weather also contributes to the death of the embryos, because insects do not fly in the rain. Temperature too high environment(over 35⁰C) destroys pollen, making it sterile. Even if the material gets on the female flower, the ovary will die.

How to fix the problem? You can attract bees by making a whey-based top dressing. 100 g of honey or a glass of sugar are added to the solution, the foliage is processed. A solution of boric acid (0.05%) stimulates the production of nectar. Honey plants planted between rows will attract more pollinators. It is good to plant hyssop or phacelia. Phacelia belongs to green manure, so after flowering it can be cut and used for mulching. Plant residues will saturate the soil with nitrogen, protect it from drying out.

You can independently perform pollination by transferring pollen from male buds to female buds with a cotton swab or brush. Perform the procedure early in the morning. To prevent the pollen from dying, keep the temperature below 30⁰C. Another way out is to plant self-pollinated varieties, for example, Zozulya, Matilda, Friendly family.

Know! Male flowers differ from female flowers in the absence of embryos, arranged in bunches.

Why cucumber fruits turn yellow in the greenhouse, causes and their elimination

The harvest is on the way, but suddenly yellow fruits appeared - what to do? Find out the reasons for the possible yellowing of the fruit:

lack of copper, phosphorus and potassium;
mosaic virus;
overripe.

The process of fruit formation takes a lot of strength from the exotic. To make vegetables healthy and beautiful, potassium, phosphorus, and copper are needed. A yellow border along the edge of the sheet will tell about potassium starvation. The lack of phosphorus is manifested by a slowdown in growth, drying out of the lower foliage. With a lack of copper, the leaves turn pale, the lashes become flabby, wither away.

Replenish micronutrient deficiencies by adding a potassium-phosphorus complex and spraying Bordeaux mixture. Cucumber mosaic affects not only the foliage, its manifestations are also visible on the fruits - deformation, reduction in size, mosaic pattern. The surface of the greens becomes yellow, covered with uneven green spots. Experienced gardeners destroy the bush when the disease has just appeared on the foliage.

Attention! It is difficult to confuse cucumber mosaic with other diseases, but an inexperienced gardener can make a mistake. Then his eyes will see the vegetables mutilated by the virus.

With dense plantings, harvesting is complicated, it is quite easy to miss the fruits. The vegetable is eaten green until the seeds have ripened inside. If an accidentally forgotten fruit reaches the stage of biological maturity, its surface will turn yellow or brown. Such fruits are suitable for livestock feed or for collecting seed material. Remember that the F1 hybrid series does not inherit maternal qualities. If you bought seeds with such markings, it is pointless to collect seed from them.

Top dressing for yellowing

To eliminate the lack of nutrients in the soil, you can use a complete mineral complex, but it is better to apply each component separately.

Emerging seedlings need nitrogen to grow. Before planting, the substrate is enriched with organic matter - humus or compost, rotted manure. Fertilizers are applied at the rate of 1-3 buckets per square meter. Watering with mullein infusion, as well as spraying, will protect against powdery mildew and support the health of the exotic.

It is useful to pour a little ash into the planting hole. It does not contain nitrogen, but is rich in potassium and other trace elements. Outside, root dressing with urea contributes to the preservation of greenery and protects against pests. Urea is diluted at the rate of 50 grams per bucket of water. During the period of budding and fruit growth, potassium and phosphorus are needed. Provide the crop with fertilizers based on potassium sulfate and superphosphate.

Remember! Natural fertilizers are preferable for vegetable and fruit crops.

From folk remedies for feeding use: infusion of mullein, wood ash or herbs, bread top dressing, infusion of rotten hay, serum solution with iodine.

To make an infusion of cow dung, mix 1 kg of fertilizer in three liters of water. Keep warm for 3-4 days and dilute in a ratio of 1:4. Weeds will serve as fertilizer if they are crushed and insisted for 10 days in a bucket of water 1 kg of vegetation.

Dilute the prepared composition 1:9 before watering or foliar feeding. Add a tablespoon of alcohol tincture of iodine to the serum solution, mix and spray on the foliage every 2 weeks. Ash infusion is prepared by pouring 3 tablespoons of the component with a liter of boiling water, incubated for 2 days and sprayed weekly. Soak a loaf of bread in a bucket of water, you can take crackers, but without mold. After 10-12 hours, strain the composition and pour in a vial of iodine. Water once every 10-14 days, diluting the mixture 1:10. Soak hay in equal proportions with water for 3-4 days. Strain and spray on the crown weekly.

What to do if the foliage of cucumbers fades and dries out in the greenhouse

Subject to agricultural technology, wilting of cucumber tops, coupled with drying, is a sign of a fungal infection. Whatever fungus strikes the bushes, the cucumber is not able to suppress its development on its own. You will have to help the exotic using one of the folk recipes described above or treat the whips with a fungicide - Fitosporin, Topaz, Fundazol or Bordeaux mixture.

Spores remain viable for several years, so the greenhouse must be kept clean. spring processing save the gardener from many problems. Moreover, it is necessary to disinfect not only the soil, but also the structure itself.

Know! To conduct a comprehensive disinfection of a glass greenhouse, use a sulfur checker. This method is not suitable for structures consisting of metal, because sulfur dioxide corrodes hardware.

The use of sulfur checkers or lumpy sulfur is carried out by igniting it on a sheet of metal. Before the procedure, seal all the cracks, work with respiratory protection. Remember that sulfur dioxide is dangerous to the body. Leave the lit checker indoors, close the doors and windows. After 3-4 days, depreserve the room, ventilate thoroughly.

Metal constructions disinfected with a solution of bleach, and wooden ones with Bordeaux liquid. Wash all surfaces thoroughly after disinfection.

Planting a crop in the same place is unacceptable, because diseases are transmitted through the soil. If crop rotation is observed, the risk of damage is significantly reduced. Tomatoes, beets, cabbage, greens are good predecessors for melons.

Spider mite causes and pest control with home remedies

The development of a colony of spider mites provokes too dry air. In a greenhouse, this phenomenon is common, especially if the gardener does not follow the irrigation regime.

Attention! The danger of the appearance of a colony lies in the spread of the tick through the air. He does not know how to fly, but is carried by air currents over a long distance.

Having noticed a colony of pests, destroy them mechanically. Quite often, sprays with soapy water or wipe soapy water the bottom of the leaves. We offer you several folk recipes for the destruction of the pest.

Infusion of onion peel

Bring to a boil a tablespoon of ground onion peel in 5 liters of water. Refrigerate until completely cool and spray with a spray bottle.

Dandelion infusion

Heat water to 40-50⁰C. For 5 liters of liquid, take a glass of chopped roots or foliage. Soak the composition for 2-3 hours and spray the whips.

Tobacco dust is an effective pest control agent. It can be used as an independent remedy or mixed with ash, mustard. But from a spider mite, a decoction made from 200 g of dust mixed with 5 liters of water is effective. First, the mixture is infused for a day, then boiled for 2 hours. After cooling, filter and add a bucket of water.

Plants in the fight against spider mites

In addition to spraying, for the prevention of ticks use joint landings with other garden dwellers. The best helper is dill. Grass attracts ladybugs who will take care of the destruction of the pest. Most pests are afraid of fragrant herbs and flowers - marigolds, coriander, onions. Sow them between the rows, and the spider mite will forget the way to the greenhouse.

If it was not possible to save cucumbers from yellowing, find the cause and eliminate it. After that, follow the agrotechnical rules:

Optimize irrigation regime.
Keep an eye on the temperature, not allowing it to drop below 15⁰C and exceed 30⁰C.
Remove excess bushes so that the landing does not look like a jungle.
Ventilate the greenhouse more often.
Systematically make foliar and root top dressing.
Make sure that the destroyed fungus or pests do not return, if necessary, re-treat.

Remember that you need to support the immunity of cucumbers; foliar feeding with urea is ideal for these purposes.

Conclusion

Video tips: why cucumber leaves turn yellow, how to solve the problem

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The most common causes of yellowing cucumbers in the greenhouse

Cucumber is a vegetable crop that loves warm and humid growing conditions. Sometimes the fruits and leaves of a vegetable growing in a greenhouse turn yellow and completely stop their growth and development. Such a change is associated with a specific cause that needs to be identified and eliminated. Otherwise get good harvest will not work. Therefore, let's try to answer the question of why cucumbers turn yellow in a greenhouse.

Yellowing of the leaves provokes a decrease in the yield of cucumbers

Growing temperature

Cucumbers do not tolerate sudden temperature changes, so failure to follow the growing technology can cause the ovary to rot, and the fruits and leaves to turn yellow.

To protect plants from negative effects and provide additional insulation, you need to cover them with a film or other synthetic material. Sometimes hot water bottles are placed under the film. It is necessary to quickly remove bad flowers and treat the cut with a solution of potassium permanganate. After that, copper chloride is used for spraying.

It is impossible to allow the temperature to drop by more than 14 degrees, since from this nutrients stop flowing into the roots of plants. It is better if the thermometer shows plus 26 degrees. You will also need to feed the leaves.

Cucumbers in the greenhouse do not tolerate temperature changes

Diseases and pests

Yellowing cucumber plants can be caused by a number of diseases:

Powdery mildew is expressed in the presence of plaque white color on the leaves. It increases with time, and the plant turns yellow and dries. To avoid this fungal disease, it is necessary to use certain varieties of vegetables that are resistant to fungi and viruses for growing. Special chemicals will also help to combat such diseases.
The death of cucumbers in the greenhouse can cause Fusarium wilt. Its fungus completely blocks the supply of nutrients to the fruits and leaves. It is necessary to completely replace the soil in the greenhouse and next time change the variety of vegetables.
Improper growing seedlings, cold watering or a sharp drop in temperature can lead to the formation of root rot. From this, the roots begin to turn yellow and crack, the leaves fade. It is necessary to introduce ash or crushed coal into the soil, spray with copper sulphate. Withered plants are removed along with the soil to avoid infecting the rest of the cucumbers.

Insect pests are carriers of various diseases:

Fusarium wilt is caused by a fungus

A large number of ties

A certain number of ovaries should remain on one cucumber stalk. If there are too many of them, the fruits may grow small and ugly, may begin to turn yellow and rot, and the embryos will stop growing. Some ovaries interfere with the growth of others due to the high consumption of nutrients. It is desirable that their number on the stem does not exceed 25-30 pieces.

New shoots must be pinched regularly, and excess ones removed so as not to delay the development of the rest. If done in a timely manner, stunting of the plant can be prevented.

It is recommended that you carefully familiarize yourself with the technology of pinching cucumbers, which is the removal of branches from the main bush. The sooner such a procedure is carried out, the less nutrients will be wasted. This will help to significantly increase the yield.

Extra ties must be removed.

Irrigation technology

Often, yellowing of cucumbers in a greenhouse is due to improper watering. This vegetable loves abundant moisture in the soil and air. If this rule is neglected, the ovary turns yellow and the leaves dry up. The irregularity and insufficiency of watering strongly affects the fruits of the plant and threatens with a complete loss of the crop.

It is necessary to water only with warm water in the evening or in the morning. During the period when the fruits are actively developing, it is worth increasing the amount of liquid. The soil is moistened deep enough so that watering contributes to the development of the root system.

Watering cucumbers should be done in the morning or in the evening.

soil care

If yellow spots appear on the leaves, and the fruits curl, this may indicate a lack of nutrients in the composition of the soil: nitrogen, potassium or magnesium. Therefore, it is worth regularly feeding the earth.

The soil is enriched with fertilizers with potassium, wood ash and other minerals.

Urea is also used as a nitrogen fertilizer. Seedlings are sprayed in advance with a special solution. After that, cow dung is introduced into the soil. Liquid chicken manure is also suitable for this. The main thing is not to overdo it with the amount of fertilizer. Their abundance in the soil can cause yellowing of the fruit.

Yellow spots on the leaves can appear from a lack of minerals.

Insufficient pollination

If the greenhouse is poorly ventilated, and the plants are pollinated only artificially, yellow cucumber ovaries may appear. It is necessary to provide access to the greenhouse for insects that should pollinate them. To do this, you need to keep the greenhouse open during the day, subject to warm weather. A large number of varieties and hybrids are pollinated by bees. To attract them, it is recommended to plant honey plants next to cucumbers or spray seedlings with the following solutions:

half a tablespoon of honey or sugar per liter of water;
half a gram of boric acid per liter of water;
boron-magnesium fertilizers, which increase the release of nectar by flowers.

Boron-magnesium fertilizers stimulate nectar secretion

bacteriosis

Very high soil moisture and a high planting density of cucumbers can lead to the development of bacteriosis, in which yellowing of the ovaries occurs. Spots in the form of sores appear on cucumbers, they dry out, new embryos do not develop.

In order to prevent this disease, it is necessary to spray the plants with a solution of one percent Bordeaux liquid. It is necessary to carefully select fruits for seedlings to reduce the risk of infection of cucumbers. It is advised to do the treatment of the plant even after the detection of bacteriosis, taking into account the degree of development of the disease. In each individual case, the appropriate agent and its concentration are selected.

In the greenhouse, it is necessary to reduce the humidity with the help of ventilation and raise the temperature to the desired norm. Infected plants are removed, and healthy ones are treated with special solutions.

Cucumbers in a greenhouse can turn yellow for various reasons, which must be addressed in a timely manner. Some use folk remedies for this, others resort to modern store preparations. But an important condition is the observance of the technology of growing and caring for vegetables. Then you can count on a rich and high-quality harvest.

Cucumber leaves turn yellow in the greenhouse: why and what to do. Cucumbers in a greenhouse: why the leaves turn yellow, how to deal with the problem Why do cucumbers have yellow leaves in a greenhouse

Wrong watering

Bad light

Unstable temperature

Soil composition

Poor pollination

Diseases

Pests

Ways to fight

Aktara

Magic Capsule

Clonex

Gliocladin

Maksim

Folk remedies

Pepper

Baguette

Milk serum

Conclusion

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It's all about the soil

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Why do cucumber leaves turn yellow and dry?

Galina, Tver

vladimir, Settlement (Penza region)

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Why do cucumbers turn yellow in a greenhouse

Why do cucumber leaves turn yellow in a greenhouse?

Why do the ovaries of cucumbers turn yellow in the greenhouse

Why do cucumber fruits turn yellow in a greenhouse?

Why cucumbers turn yellow in the open field

Why do the leaves of cucumbers turn yellow in the open field

Why do the ovaries of cucumbers turn yellow in the open field

Why do the fruits of cucumbers turn yellow in the open field

Cucumbers turn yellow - how to fight

Fighting yellowing cucumbers

Cucumbers turn yellow - folk remedies

Why do the ovaries of cucumbers turn yellow in the greenhouse.

Why do cucumber fruits turn yellow in a greenhouse.

Why cucumbers turn yellow in the open field

Why do the leaves of cucumbers turn yellow in the open field.

Why do the ovaries of cucumbers turn yellow in the open field.

Why do the fruits of cucumbers turn yellow in the open field.

Cucumbers turn yellow - how to fight

Fight against yellowing of cucumbers.

Cucumbers turn yellow - folk remedies.

Why do cucumber seedlings turn yellow and dry, in a greenhouse and in open ground: the most common reasons. What to do if cucumber leaves turn yellow?

What to do if cucumber leaves turn yellow?

VIDEO: Cucumber leaves turn yellow

What is the danger of changing the color of cucumber foliage

Causes of yellowing cucumber leaves in the greenhouse

Folk remedies to combat yellowing leaves

Why the ovaries of cucumbers (embryos) turn yellow in the greenhouse what to do

Why cucumber fruits turn yellow in the greenhouse, causes and their elimination

Top dressing for yellowing

What to do if the foliage of cucumbers fades and dries out in the greenhouse

Spider mite causes and pest control with home remedies

Video tips: why cucumber leaves turn yellow, how to solve the problem

The most common causes of yellowing cucumbers in the greenhouse

Growing temperature

Diseases and pests

A large number of ties

Irrigation technology

soil care

Insufficient pollination

bacteriosis

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