Why do the ovaries turn yellow in a greenhouse cucumber. Cucumber leaves turn yellow in the greenhouse: why and what to do

The appearance of yellowness on the leaves of greenhouse cucumbers is a signal for the gardener that the plants have problems. It is required to know exactly why the leaves of cucumbers in the greenhouse turn yellow and how to deal with it in order to get a decent harvest.

In film and polycarbonate greenhouses yellowing of foliage cucumber plantings cause various reasons.

Violation of agricultural technology

Improper care leads to a slowdown in crop growth, a change in leaf color from bright green to yellow and Brown, fading.

Poor lighting

Cucumbers - warm and light-loving plants, and if the illumination in the greenhouse is low, the foliage turns yellow. Along with the leaf blades, with a small amount of light, the ovaries turn yellow and dry out.

watering

Improper watering leads to a problem - cold water, with irrigation by bushes. Yellowness appears after watering with unsettled water taken for irrigation from a water supply system or a nearby pond, lake, and also immediately after rain.

Adverse weather conditions

Cucumbers grown in greenhouses are reliably protected from the vagaries of the weather, but prolonged absence sun, heavy rains, colds affect the condition of vegetables. AT middle lane, areas of the North-West, Siberia, summers are often cool, with a small amount sunny days, and all this affects plants.

temperature fluctuations

In polycarbonate shelters, there is a difference between night and day temperatures, which worsens the condition of foliage and cucumber lashes. It is hot in the greenhouse during the day, at night the temperature drops (especially at the end of summer) to critical levels, and such drops cause inhibition of plants and the appearance yellow leaves.

Soil Nutrient Deficiency

The lack of nitrogen loved by cucumbers is the cause of yellow leaves. With nitrogen starvation, leaf blades first become light green, then turn yellow. In size - small, shriveled, and the bushes themselves grow slowly.

Lack of pollination

Growing bee-pollinated varieties of cucumbers in shelters requires gardeners special attention in plant care. In the absence or small number of insects that pollinate cucumbers, the bushes will turn yellow and dry out. The number of ovaries will decrease, which will ultimately affect the overall yield.

Joint plantings

To save space, gardeners small areas cultivated in the same greenhouse tomatoes and cucumbers. These cultures require different conditions and care, so in such joint shelters there is a high risk of infections and their symptoms - yellow spots.

Diseases

Greenhouse cucumbers suffer from various infections, which first leads to yellowing of the stems and leaves, and then to the complete death of the culture. Common diseases of cucumbers in a greenhouse:

1. Powdery mildew. Occurs with temperature changes, humidity indicators, lack of ventilation.
2. Downy mildew (peronosporosis). A common cause of the disease is watering cucumbers with cold water, a sharp drop in temperature. Polygonal yellowish spots appear on the upper surface of the leaf blades, grayish-lilac, purple spots appear below.
3. Yellowness appears when the vegetable is infected with copperhead (anthracnose). The causative agent of the infection is the fungus Colletotrichum lagenarium. Yellowish, brown spots form from the edges of the front side of the leaves, after a while they appear in their place. through holes. If left untreated, copperhead affects greens (yellow and brown spots also appear on them).
4. Cladosporiosis (brown spot). A dangerous infection that instantly spreads in shelters and can kill most harvest in 5-6 days. The yellowish spots that appear quickly turn brown, then the infection spreads to the fruits. As a result, the plant dies. Reason: excessive watering, non-compliance with the temperature regime.
5. Mosaic (white) – viral disease. Yellowish and white stripes form on the leaves. The infection is not treated, the affected bushes are destroyed.

Prevention is the main condition to prevent the disease in the greenhouse and avoid long and not always effective treatment.

Pest infestation

Insect pests are capable of leading to yellowing, and then to the death of plants. Most often, cucumbers in greenhouses are attacked by:

• whiteflies;
• slugs
• aphids;
• spider mite;
• beetle larvae.

Pests feed on plant juices, causing growth retardation, wilting, drying and death of cucumber plantings.

A large number of ties

Causes yellowing of the leaves and drying of the bushes, congestion of the plant with ovaries. Experienced gardeners know what to leave on the bush optimal amount ovaries - 22-30 pieces (determined by the characteristics of the variety or hybrid), and pluck the rest. Be sure to form and pinch bushes.

Troubleshooting Yellowing Leaves

Having identified the cause of the appearance of yellowness on the bushes, they choose ways to eliminate the phenomenon, methods of struggle and treatment.

Proper agricultural technology

Compliance with the basic rules for caring for cucumbers in greenhouses is the condition under which the plants will feel comfortable, not get sick and enjoy the harvest.

• A place for a cucumber greenhouse is selected sunny, protected from the winds. When planting, observe the distance between the seedling bushes, avoiding thickening.

• Plantings are watered, given weather, crop condition, soil moisture. Use settled warm water(+22ºC ... + 23ºC), watered into specially made grooves, holes. It is not recommended to water under the root, as the water erodes the soil, the roots are exposed. Schedule: young bushes are watered every 2-3 days, approximately 4-5 liters per m2, from the moment the ovaries are formed, the volume is doubled. The frequency varies, much depends on the weather. Useful for cucumbers spraying on leaves, but only warm water and in the morning, so that the moisture has time to dry before nightfall.
• When cold, it is recommended to use in greenhouses nonwovens, bury hot water bottles in the ground.
• Cucumbers love nitrogen, the lack of an element leads to significant crop losses. But any top dressing is applied, strictly observing the norms of fertilizers, taking into account the type of soil.
• It is important to observe the alternation of landings vegetable crops in greenhouses. It is not allowed to plant cucumbers after pumpkins, zucchini, but after beans, tomatoes, celery, this vegetable grows remarkably.
• It is not recommended to plant tomatoes and cucumbers in the same greenhouse. If there is no other way out, then a partition is made inside the shelter that separates parts of the greenhouse. This is due to the fact that tomatoes need drafts, and cucumbers love heat and high, but moderate humidity.
• To attract pollinating insects, honey plants are planted near the greenhouse, spices. With a small number of bees, cucumbers are manually pollinated; it is also recommended to select parthenocarpics and self-pollinating varieties for protected ground. The treatment of bushes with preparations Ovary, Bud helps.

A separate issue is the formation of cucumber bushes. In greenhouses, plants are grown on trellises, as in this case free air ventilation, lighting, and easy care are provided. First side shoots, and the flowers from below are removed, a pair of leaves is left. Further, as they grow, three sheets are already left, then four. A properly formed bush resembles an inverted pyramid. When reaching the upper limit on the trellis, the stem is pinched.

Soil care in the greenhouse

The culture is demanding on the quality of the soil, so from the very beginning the soil is carefully prepared for future plantings. Recommended:

• loose, nutritious soils;
• acidity index pH 7;
• arrangement of ridges on biofuel (warm ridges);
• fertilization before planting (ammonium nitrate, potassium sulfate).

AT top layer soil form a high percentage of humus, since root system plants lie near the surface. Acidic soils need to add fluffy lime (per 1 m2 - 50-100 grams), on slightly acidic soils add ash (per 1 m2 - 1 kg).

It is advisable to mulch plantings with chopped straw, well-ripened compost or composted peat.

Attention! Fertilizers are applied not only before planting vegetables, but also during the growing season (interval - 14-16 days). They combine organics and "chemistry", observing the dosages of the products and the recommendations of agronomists.

To improve the structure of heavy soils, sand and vegetable compost are added. On light sandy soils, well-rotted mullein, sapropel, and composts are introduced.

Treatment of diseases

Infections caused by pathogenic fungi respond well to treatment in the early stages.

1. Treatment for powdery mildew includes treating the bushes with a solution of liquid mullein (1-1.5 liters) and urea. An effective composition with potassium permanganate (spraying on the leaves with a pink solution), a composition with soda ash and soap (4 grams of soda and a little soap for stickiness are taken per liter of water).
2. With peronosporosis, the leaves are treated with a composition with blue vitriol and lime (10 liters will require 100-150 grams of each substance).
3. They fight with copperhead using Bordeaux liquid (1% solution), Maxim fungicide also helps.
4. When signs of cladosporiosis appear in shelters, the bushes are treated with Fitosporin, Hom preparation.

It is important to follow the rules of care, do not forget about the prevention of infections.

Viral infections cannot be treated. At the first sign of disease, plants are carefully dug up and destroyed. The soil must be disinfected.

For the treatment of fungal and bacterial diseases, drugs are used:

• Phytosporin (in paste or liquid form);
• boric acid;
• Glyocladin;
• Previcour;
• Topsin;
• Byleton.

Getting rid of pests

From dangerous insects, causing a lot of harm to plantings, are disposed of with the help of folk remedies and chemicals. The spectrum of "chemistry" is great, but do not rush and immediately treat the bushes with potent compounds.

From aphids effective preparations Fufanon, Fitoverm, Commander. Vertimek, Oberon will help to deal with spider mites, Spark, Aktara, Confidor are used in the fight against whiteflies.

Good results are obtained by involvement in pest control beneficial insects – ladybugs, lacewing, as well as feathered helpers.

AT recent times as well as folk remedies gardeners are increasingly using biological preparations that do not contain dangerous toxins. Among them are Enkarzin, Verticillin (based on fungi and microorganisms that destroy larvae and adult pests).

Folk recipes

To strengthen the immune system of cucumbers, get rid of yellow leaves, the use of formulations prepared according to folk recipes. Their advantages:

• ease of preparation;
• efficiency;
• economy.

The most popular compositions:

Shavings are diluted in a liter of milk laundry soap(20 grams), 40 drops of iodine. Then the mixture is poured into a bucket of warm water (9 liters), mixed. Cucumbers are sprayed every 10 days (2-3 times per season).

1. Take whey (4 liters), add 300 grams of granulated sugar, mix. Dilute with water to a total of 10 liters, mix. Spray the bushes.
2. Half a liter of onion peel is poured with boiling water, insisted for a day. The composition is filtered, diluted in five liters of water. Spray cucumbers every two weeks.

It is not necessary to use all recipes at the same time. It is advisable to choose a couple of funds and process the landings.

When yellowness appears on the leaves of cucumbers, they pay attention to all conditions, indicators, symptoms, trying to identify the cause of the changes as soon as possible. Yellowness due to aging of the plant or thickening is not so terrible, and the problem is solved by removing the leaves. More difficult cases(violation of agricultural technology, diseases, pests) require surgical intervention, treatment.

Cucumbers are one of the most common vegetable crops in our country. They are grown in open field and greenhouses. With good, proper care, gardeners collect high yields very healthy, dietary vegetables.

However, quite often we encounter various diseases of young and adult plants. For example, many gardeners complain that cucumbers grown in a greenhouse turn yellow, leaves, fruits and individual parts of the plant dry out. In order not to lose the future harvest, to prevent the plants from dying, it is urgent to take appropriate measures. We will talk about them today with you.

So, why do cucumbers turn yellow in a greenhouse, what to do about it? Why do cucumber leaves turn yellow? Why is this happening and what needs to be done? Find out right now on this page "Popular about health":

Causes of yellowing of plants and young fruits, what to do?

Experts note a number of main reasons and factors due to which this negative phenomenon occurs. Let's talk about them in more detail:

Wrong watering

Cucumbers are very fond of water, with its insufficiency, leaves and stems turn yellow, new fruit ovaries do not develop. Therefore, they need to be watered more often. Be sure to water with settled water room temperature and never use cold.

If it's cool outside, water them in the afternoon. If sunny and warm - in the morning. On hot days, spend morning irrigation, refreshing watering. And the usual - in the evening.

At the same time, keep in mind that the soil needs to be moistened enough so that the root system actively develops deep into the soil, and not located superficially. When the culture begins to bear fruit, watering is carried out more often.

Weather

The weather is very often the cause of yellowing of plants and young fruits. In particular, cold, damp weather, dampness, late spring frosts- negatively affect plants, damage them.

Minerals and soil composition

If the leaves are observed yellow spots, this may indicate a lack of potassium in the soil. If they are light green, then there is not enough magnesium. In this case, the plants should be fed with the appropriate fertilizer.

Often cucumbers turn yellow in a greenhouse due to a lack of nitrogen in the soil, its scarcity. Therefore, make sure that the plants receive top dressings on time, but at the same time do not overfeed them. If there is an excess of minerals in the soil, it is also harmful for cucumbers.

Feed during flowering complex fertilizers containing phosphorus, potassium and fluorine. Water the soil with the mullein solution. Before planting seedlings and after harvesting, fertilize the soil with manure.

Diseases and pests

bacteriosis:

If you notice that cucumber ovaries rot, remove faded inflorescences as soon as possible, then treat these places with a pink solution of potassium permanganate. To prevent the spread of bacteriosis, spray the plants abundantly with the same solution, or use Bordeaux liquid (1%) or copper oxychloride (0.4%).

powdery mildew

If whitish spots appear on the leaves, resembling plaque, the size of which gradually increases, this is a sign of damage to the plant by powdery mildew. To combat this disease, use fungicides, such as Topsin, Karatan or Bayleton.

downy mildew

This disease is called pernosporosis. Young fruits affected by it turn yellow and wrinkle. The leaves are covered with dark green spots.
To combat it, treat the plants Bordeaux mixture or use copper chloride. A week later, treat the cucumbers in the greenhouse again with Bravo or Avixil preparations.

Fusarium wilt

This dangerous fungal infection can completely destroy the future crop. To avoid this, you will have to completely change the entire soil in the greenhouses.

root rot

In this case, the leaves of the cucumber culture turn yellow from below. The disease occurs due to strong changes in air temperature during the day and at night. In addition, watering with very cold water can be the cause. To avoid this disease, periodically use the drug Previkur.

Insects - pests

Very often, pests are the reason that cucumbers turn yellow in the greenhouse. So what to do in this case?

The most dangerous for this vegetable crop are melon aphid, which settles on reverse side leaves, sucking juices out of them, as well as spider mite that infects the leaves. It can be detected by thin cobwebs on the back of the sheet.

Other causes of yellowing:

Often cucumbers turn yellow due to the large number of ovaries. In greenhouse conditions, plants develop rapidly. But to get good harvest healthy vegetables, 30 ovaries are enough. The rest are best removed.

Another reason is growing in a greenhouse. hybrid varieties that require artificial pollination. If a natural process pollination was insufficient, young cucumbers turn yellow early.

Remember that when leaves and young fruits turn yellow (old fruits turn yellow for natural reasons), the cause of this phenomenon should be identified and eliminated as soon as possible.

Compliance with the rules of agricultural technology, timely elimination of diseases and pests will help you harvest a good harvest of healthy, healthy vegetables.

Greenhouses are a real lifesaver when the site is not suitable for safely growing plants. There can be a great many reasons: strong wind, lack of shade or, conversely, an overabundance of shade, unstable air temperature, heavy rains. In such cases, it is much easier and cheaper to grow vegetables in a greenhouse. But it happens that you planted cucumbers in a greenhouse, the seedlings took root, grew, but at some point the leaves turned yellow. This is an alarming symptom that can be caused different problems with vegetable growth. This article is devoted to listing and describing the main causes of yellowing cucumbers.

One of the most common causes of yellow leaves is excessive low temperature air. Cucumbers are heat-loving plants that in any situation need an abundance of sunlight and a stable temperature of + 23 ° С - + 26 ° С. If, due to frost, the temperature in the greenhouse fell below + 18 ° C, it is understandable why a characteristic yellowness appears on the leaves. In this case, you need to increase the temperature in the room, for example, make organic fertilizers(mullein, horse dung) at the beginning of the season, before planting.

lack of moisture

Another common cause is lack of moisture in the soil. Cucumber seedlings are especially acutely experiencing dry periods. For Abundant Growth, Healthy Growth and Absorption nutrients from the soil, cucumbers need regular watering. Otherwise, they stop distributing the accumulated liquid into the leaves, keeping the stems, inflorescences and fruits in good shape. What to do in this case? If you do not have the opportunity to regularly water the plantings in the greenhouse (for example, you are leaving somewhere), leave water containers throughout the area of ​​\u200b\u200bthe room to humidify the air, or set up automatic watering.

Video "The most common mistakes when growing cucumbers"

An informative video that will help you avoid serious problems with cucumbers thanks to proper care and cultivation.

Mineral deficiency

If you follow the watering, the beds are warm, but you don’t know why the leaves of the cucumbers turn yellow, then pay attention to the fertilization of the soil. In case of a lack of nutrients necessary for active metabolism, the plant begins to turn yellow. If the yellowness is concentrated along the edges of the leaves, then you need to make fertilizer with potassium and magnesium. If the leaf is uniformly yellow with dark green veins, iron and manganese are needed. If the leaves turn yellow mainly on the upper part of the plant - cucumbers, their seedlings and greens need copper.

Why do we need fertilizer and why do cucumbers have little chance of growing healthy without them? Everything is very simple, for the growth of a plant, a certain set of mineral and organic foods is needed, which activate and support the vegetative processes. It is recommended to do 3-4 foliar feedings throughout the season to keep the amount of minerals in a normal amount.

Many ovaries

Exhaustion can also cause the leaves to turn yellow. During flowering in the greenhouse, too many ovaries may form, they partially fall off, less often turn yellow. The abundance of ovaries depletes the vegetable, which is why on the eve of the fruiting stage it is important to do foliar top dressing- so you support the plant during a grueling marathon. Why else can many ovaries form? Perhaps you fed the plants too hard in the first half of the season, so that it produced as many ovaries as it could, but the supply of nutrients has dried up and it can no longer continue in the same spirit.

Diseases

In the greenhouse, for most diseases that feed on cucumbers, a real expanse. Some types of fungal diseases prefer the microclimate of greenhouses, which is why it is important to do antifungal treatment of plants with fungicides.

The leaves actively turn yellow and become covered with plaque in case of powdery mildew. Its growth is promoted by temperature changes and watering with cold water. The leaves turn yellow and then fall off when affected by downy mildew. Finally, one of the most dangerous diseases - root rot, which destroys the roots of the plant, causing the stems and leaves to turn yellow.

Pests

Various insects do not mind settling in the greenhouse. The most active in their malignancy are the spider mite, which attacks the vegetable with a whole colony, and the whitefly, which eats the leaf clean. The end result of their activity is that the plant turns yellow, in some cases it dies. It is recommended to do preventive treatment against insects, as well as regularly thin out plantings so as not to create favorable conditions for the development of spider mites and whiteflies.

Video "Causes of yellowness on the ovaries of cucumbers"

An informative video that will provide answers to many questions of most gardeners.

Hello. Tell me, please, why do cucumber embryos turn yellow in a greenhouse? Is it possible to do something about this, some kind of prevention? Svetlana, Kostroma.
Every gardener has a garden with cucumbers. It is most convenient to grow this vegetable in a greenhouse, because everything can be provided there. the necessary conditions. But, sometimes, the culture is affected by various diseases and not infrequently its leaves and embryos turn yellow. What to do in this situation and how to save cucumbers? Let's take a closer look in our article, and also study the proposed video.

Causes of yellowing and their elimination

The main reasons are as follows:

1. Failure to comply with the correct temperature regime. Cucumbers do not tolerate temperature changes well. Do not let it fall below 14 degrees. To increase it, you can cover the bushes with a film and put bottles of hot water under it.
2. The presence of diseases. Powdery mildew is removed chemicals. The fungus is destroyed when the soil and vegetable variety are completely replaced. Root rot is treated with copper sulphate.
3. Pests. The greenhouse whitefly can be removed using boards on which honey is applied - the insect sticks to them and dies. From melon aphids, spraying with tobacco infusion is used. Spider mites are controlled with chemicals.
4. Too much a large number of ovaries. New shoots need to be pinched regularly, and unnecessary ones removed so as not to reduce the development of the plant. It is necessary to ensure that the number of ovaries on one stem does not exceed 25-30 pieces.
5. Wrong watering regime. Cucumber loves when the air and soil are abundantly moistened. Watering is carried out in the morning or evening with warm water. During the period of active fruit development, the amount of liquid during irrigation should be increased.
6. Lack of nutrients in the soil. To avoid this, it must be fertilized with minerals ( wood ash, potassium, urea, etc.).
7. Insufficient pollination. To attract bees, you need to open a greenhouse in warm weather. It is also worth planting next to cucumbers honey plants. Spraying with sweet solutions will also help.
8. Bacteriosis. Occurs due to high humidity and insufficient space between the bushes. Removed by spraying with a solution of Bordeaux mixture.

Advice. Remember to ventilate the greenhouse regularly, maintain the right temperature, and remove infected plants.

How to avoid yellowing?

A few tips to help avoid yellowing cucumber germs:

• install several thermometers around the greenhouse in order to monitor the temperature, because. in different parts greenhouse, it can vary;
• the greenhouse must have a well-thought-out ventilation system;
• bees pollinate flowers in the morning from 6 to 10 o'clock, it is at this time that it is necessary to open the greenhouse doors and lure insects;
• do not plant cucumbers in the same place, alternate them with other crops;
• remove weeds not only inside the greenhouse, but also outside near it;
• the remains from last year's harvest must be removed completely and it is better to burn;
• when fertilizing the soil, strictly follow the indicated doses.

Attention! Treat the greenhouse room with a disinfectant, and whitewash the racks and walls with lime!

Prevention of yellowing

Prevention will help to avoid problems with yellowing of cucumber germs. First of all, properly prepare the soil for planting. Select seeds carefully and process them with high quality. Strictly observe the timing of sowing and transplanting seedlings. Form the plant in time, pinch and tie. Do not forget about weeding and loosening the soil.

Regular and thorough inspection of all plants will help to defeat the problem in the bud. Do not save on the quality of fertilizer and chemical protection from diseases and pests.

Advice. When the crop is fully harvested, process and dig all the soil!

Attentive attitude to plants will help the scrupulous gardener to quickly identify the problem and eliminate it. Do not run cucumbers, process them, take care of them and any of his illnesses will be on your shoulder. And quality preventive measures will help to get a tasty and rich harvest.

Why do cucumber ovaries turn yellow - video

This article will describe the most common causes of yellowing of the ovaries, as well as the process for their solution.

Insufficient soil moisture and incorrect soil temperature

Although cucumbers are not too picky to care for, they still have their own growing conditions, which will have to be carefully observed. For example, plants need a stable temperature of the air in the room and the soil itself, if the temperature suddenly starts to drop sharply, then the embryos on the cucumbers will immediately turn yellow, which will lead to the destruction of the crop. This happens because as the temperature drops useful material cannot be delivered to the ovary so quickly, at which point yellowing begins.

It is also important not to forget about the quality and constant watering, it is worth using exclusively warm water for irrigation, since the soil in the greenhouse should not be very cold. If watering is not sufficient, this will lead to yellowing of the ovaries.

When the gardener is faced with the question of why cucumbers turn yellow in the greenhouse, and does not know what to do yet, then he should consider the main reasons for the yellowing of the ovaries. If the two listed factors caused yellowing, then it is urgent to establish the process of watering the plant, and also try to maintain the most in the greenhouse. comfortable temperature air so that these plants develop faster.

A large number of extra ovaries, inflorescences were not pollinated

When the question arises why the cucumbers turn yellow in the greenhouse, and what needs to be done about this problem, it is first recommended to understand the reasons for the yellowing of the future crop. For example, if there is an excessive amount of ovaries on a cucumber branch, then the plant simply will not be able to supply them with the necessary substances in abundance, so the embryos begin to turn yellow. In this case, it is recommended to remove the extra ovaries in the bush, normally each plant should have about twenty-five fruits, but it is possible to grow thirty, the rest of the ovaries should be eliminated.

Incorrectly prepared soil

When there are not enough useful microelements in the soil, this leads to the question of why the cucumbers in the greenhouse turn yellow, and what needs to be done in this situation. Cucumbers will grow well only in the soil where there is a large amount of potassium and nitrogen, if these substances are not enough to feed the plants, then the embryos will begin to turn yellow and fall off. It will be impossible to fix this problem, so you should take care of the quality of the soil even before planting seedlings in it.

And then you will also have to make additional approvals that will help the cucumbers develop normally and bear fruit throughout the entire period of their growth. When it is necessary to add nitrogen to the soil, a solution of urea is prepared, but to create potash fertilizer, suitable tree resin. If the gardener keeps chickens or cows, then he will be able to use a cow or chicken manure to improve the soil, manure is diluted with water, and then the soil is watered with a solution. In the case when these fertilizers are not at home, it is worth using any purchased dressing intended for vegetables.

Diseases affecting plants and their embryos

If plants are attacked various diseases and yellowness appears on the ovaries, the question immediately arises why the cucumbers in the greenhouse turn yellow, and what needs to be done. For starters, you should know that only some types of diseases cause yellowing of the ovaries, so you should figure out which disease affected the plant. For example, the most common types of diseases are common powdery mildew, fusarium, bacteriosis and downy mildew, also called pernosporosis. It is worth knowing about each of these diseases in more detail, since it is necessary to determine what type of disease the plant succumbed to.

Bacteriosis. This disease can also cause yellowing of the ovaries, like other types of diseases. Most often, bacteriosis can begin for the reason that the gardener waters the plants too often, due to excess moisture in the soil, and pathogenic microorganisms begin to develop. So that the moisture in the soil does not build up, it is worth periodically airing the greenhouse, and the appearance of the disease is also affected by the fact that the cucumbers were planted too close to each other. Some gardeners want to get a bigger harvest, so they plant seedlings as close as possible, this leads to the appearance of bacteriosis. Need to learn right

Ordinary powdery mildew. The carriers of the disease are old weeds, as well as leaves from last year's plants, if these grasses and weeds were damaged by powdery mildew, then the chance of new seedlings getting infected with this disease is extremely high. It is very easy to notice such a disease, because a few days after watering, it appears on the leaves and ovaries. white coating. Here we include the false powdery mildew, this disease begins to manifest itself as yellow small spots on the leaves.

After some time, a gray-purple bloom appears on the other side of the leaves, this disease may occur due to abundant watering or too close seedlings in the greenhouse. When such spots appear, the gardener immediately thinks about why the cucumbers turn yellow in the greenhouse, and what needs to be done with such a problem. Solving the problem is quite simple, it is enough to ventilate the greenhouse, regulate the watering of plants, and also thin out the seedlings.

Fusarium. This disease is infectious in nature, but it can also affect the leaves and embryos of cucumbers, which leads to their yellowing. Infection occurs through the soil, in which case the fungus begins to penetrate the plant through the roots and stem, affecting the leaves, shoots and embryos. After a while, the plant will be completely destroyed infectious disease, most often fusarium occurs in greenhouses, where the gardener waters the plants too often, and also does not ventilate the room. Not only adults, but also the first young seedlings can become infected with the fungus, so it is recommended to pre-treat the soil with antibacterial and antifungal drugs.

The most common causes of embryo damage and yellowing

Often, gardeners are faced with the question of why cucumbers turn yellow in a greenhouse, and what needs to be done (video), but first it is worth considering the most common causes of yellowing of ovaries on plants. So, as already mentioned above, main reason yellowing becomes improper watering, as well as too high humidity air in the greenhouse, in addition, the appearance of yellowness can occur due to too cold air in the room for growing cucumbers, lack of moisture in the soil.

One more at least common cause yellowing becomes a large number of ovaries on the vegetable and insufficient pollination of inflorescences during flowering. But there is another unpleasant factor that leads to the question of why cucumber leaves in the greenhouse and embryos turn yellow, and what needs to be done about it - plant damage by pests. Must be to receive big harvest these vegetables.

Most often in cucumbers you can find such harmful insects as greenhouse whitefly, root rot, spider mites and melon aphids. Each of these pests affects the plant in different ways, so it is necessary to consider each insect separately in order to understand which one is wound up in cucumbers.

Root rot. This disease is one of the most common, in addition, it can affect not only cucumbers, but also most of all vegetable crops in the garden and greenhouse. If the plant has become infected with root rot, a white coating begins to appear on the leaves, after a while this coating passes not only to new shoots, but also to the embryos themselves, thereby destroying them. The reason for the appearance of this disease can only be increased humidity in the greenhouse and in the soil. If you water cucumbers with cold water, the risk of infection increases significantly.

Melon aphid. Infection occurs most often from weeds, aphids move to cucumbers and begin to slowly suck the juice from the stems and leaves, but besides this, insects secrete poison, which destroys the plant.

Greenhouse whitefly. This insect looks more like a small moth, but it is extremely prolific, for the most short term the whitefly breeds huge offspring, which completely destroys the crop of cucumbers in the greenhouse. If the gardener faced an unsolvable question, why cucumbers in the greenhouse and embryos turn yellow, and what needs to be done, it is worth starting an urgent fight against these harmful insects. This can be done with folk remedies, or with the use of chemicals.