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Why cucumbers turn yellow in the greenhouse and in the open field. Why does the ovary of cucumbers turn yellow in a greenhouse and open field, what to do Small cucumbers turn yellow what to do

Yellowing leaves in cucumbers is a problem that almost every gardener encounters. In some, the lower leaves turn yellow or become stained, in others the cucumbers turn yellow, wither and dry out, in others, the leaves turn yellow at the edges, forming their own kind of border.

Why the leaves of cucumbers turn yellow is often not so easy to understand, because there are many reasons and it looks like they all fit your case. But you have to do something, because you don’t want to lose the harvest. How to prevent yellowing of cucumber tops and what to do if cucumber leaves have already begun to turn yellow? Let's define now.

Why do cucumber leaves turn yellow: 6 reasons

First reason commonplace - individual lower leaves inside the beds turn yellow and dry out from lack of light. And this is not a cause for concern at all, this is a normal phenomenon. As a rule, a cucumber bed is a natural lush thicket, it is not surprising that light gets inside with difficulty and it is not enough for the lower old leaves. In this case, just pluck the yellow leaves from time to time and enjoy the harvest.

Reason two- lack or excess of moisture. In an ordinary summer, cucumbers are advised to be well watered two or three times a week, and in hot summer - every day, deeply wetting the ground. Otherwise, the roots of cucumbers will begin to "show up" to the surface of the earth in search of moisture and may dry out. For plants, this is a disaster, both leaves and ovaries begin to turn yellow. Cucumbers also do not like rainy weather: the roots rot, rot forms on the stems, as a result, we again observe yellow leaves.

Reason three- fungal diseases. Most likely it is fusarium, pitiosis and other fungal diseases that cause yellow leaves on cucumbers. At first, rusty spots appear on the tops, later the leaves become covered with spots completely, dry out, fall off. At the same time, in the case of Fusarium, the lashes become sluggish, like a rag, and do not respond to watering. If the thirty-degree heat has been replaced by cold rains and lower night temperatures, hold on: the fungi will not take long to wait.

Reason four- pests. Whitefly or spider mite suck out all the juices from cucumber leaves, subsequently the leaves turn yellow and die. In this case, the recommendations are obvious: a good pest is a dead pest. It will happen either to spray the garden with "poison", or to escape folk remedies.

Reason five- lack of nutrients. The most unlikely, but still occurring, cause of yellowing cucumber leaves. If the cucumber leaves turn yellow and the edges dry, they probably lack potassium or magnesium. Dark green veins against a background of yellowness may indicate a lack of iron or manganese. Yellowing upper leaves occur with copper deficiency. Fertilizers will help to correct this situation.

Well, the last reason yellow leaves - old age. Over time, the cucumber leaf coarsens, ages, completes photosynthesis, turns yellow and dies. Most likely, by this time you have already had enough of cucumbers to satiety, and the aging lashes do not bother you. But if you want a fresh cucumber right from the garden until autumn, there are ways to “prolong the life” of cucumber lashes, we will talk about them later.

What to do if cucumber leaves turn yellow

The best cure for anything is prevention, and yellowing cucumber leaves are no exception. It is easier to prevent something similar in your garden than to treat it later. That's why:

We wish you success and good harvests!

This year we planted seedlings of cucumbers F1 "Zyatek" in the greenhouse. According to the description on the bag, they should form from 2 to 8 fruits in each leaf axil. Fruiting has already begun, but some ovaries turn yellow and dry out. Why is this happening? The leaves on the plants are green, large, pests are not visible.

Beam hybrids of cucumbers, namely, Zyatek belongs to them, in last years became very popular. There are really a lot of ovaries in the axils of the leaves, but rarely anyone manages to save them all. If we exclude the attack of pests and the development of any diseases, then we can name several reasons for the yellowing and drying of greens. Let's try to find out why cucumbers turn yellow in a greenhouse.

This is how the ovaries of bunch cucumbers should look like

Reason one: plants are too densely planted

They simply do not have enough food area, so they cannot feed all their numerous offspring. In particular, for Zyatek cucumbers, the recommended distance between adjacent plants is 50 cm, which means that they are not needed to be planted closer, even with a vertical growing method. For each specific variety or hybrid, this information is indicated in the description on the bag.

Reason two: plants do not form

Many novice vegetable growers allow cucumbers to grow arbitrarily, it seems to them that by pinching certain lashes, the yield will decrease. As a result, thickets of intertwined vines with large leaves form in the greenhouse, through which sunlight breaks through with difficulty. Under such conditions, not some of the greens can dry out, but almost all - the cucumbers turn yellow and fall off. The formation of cucumbers is simple: from the sinuses of the lower 3-5 leaves, you need to pluck the stepchildren completely. The upstream shoots should be pinched off after the second leaf. Stepsons of the second order, which will form from the axils of the leaves of the secondary lash, should remove the growth point after the formation of the first leaf.

Yellow cucumbers in the greenhouse, what to do?

Reason three: improper feeding

If, at first, cucumbers, as a rule, are fed with fermented manure, i.e. predominantly nitrogen, then with the onset of fruiting, the needs of plants change, they already require both potassium and phosphorus. Therefore, superphosphate and ash must be added to infusions of grass or mullein. You can use complex fertilizer, for example, "Kemira" or similar.

Reason four: fruits that have grown to the size declared by the manufacturer are not removed in a timely manner

Overgrown fruits (or one fruit) greatly delays the development of other ovaries. For bunch cucumbers, the presence of overgrowth, even an extra 2 hours on the lash, affects the greens.

Something has changed in the growing conditions, so the cucumber fruits that have begun to grow have partially turned yellow

Reason #5: You may need a pollinator

Modern hybrids and varieties are predominantly parthenocarpic, not requiring pollinators. To bee-pollinated varieties and hybrids, you need to plant 1 or several (depending on the size of the greenhouse) pollinator plants, i.e. cucumbers of other varieties that have male flowers. In the latter case, care must be taken to attract pollinating insects.

A little about care

The soil on which bunch cucumbers grow must be fertilized, loose and always moist. These plants need to be fed weekly, but an excess of nitrogen can lead to a decrease in the number of ovaries. Under adverse weather conditions (for example, prolonged cloudy weather, i.e. lack of sunlight, or a sharp cold snap), it is advisable to spray the cucumbers with Epin-Extra or Zircon. To speed up the filling of greens in the greenhouse, you can install a container with fermenting manure or grass. The “aroma”, of course, will be specific, but the carbon dioxide released, which is necessary for plants for photosynthesis, will significantly increase the growth rate of fruits.

Subject to agricultural technology, the probability of getting a decent crop of cucumbers is very high.

And finally

All plants bloom "with a margin", which means they form more ovaries than they can feed, so the drying out of some part is a normal phenomenon.
We hope that our explanations will be useful, and you will be able to save the maximum amount of greens in each bunch.

You can be completely without a crop if the ovaries of cucumbers begin to turn yellow and fall off. But timely measures taken help to rectify the situation.

In most cases, cucumber ovaries turn yellow due to care errors. The main reasons for this complication:

  1. Plants lack light. Perhaps the beds are located in a shaded area or the greenhouse is installed where there is little sunlight.
  2. Irrigation miscalculations. If there is little moisture, not only the ovaries, but the entire lash can dry out. If there is too much, the roots will rot. Improper watering not only weakens plants, but also creates conditions for the development of diseases.
  3. Formation of ovaries on young, undeveloped lashes. Such a shoot itself needs strength to grow, so it discards the ovaries formed too early.
  4. Too many leaves. This also includes cases where a lot of side shoots are formed. In such a situation, food goes to the tops, and the ovaries turn yellow and fall off.
  5. Too many ties. The optimal number of ovaries on one stem is up to 30 pieces. If there are more of them, the root system will not be able to provide them with nutrition and moisture.
  6. Overripe cucumbers. The plant begins to spend all its strength on these specimens, trying to bring the matter to the full ripening of the seeds. Often, even one such fruit can provoke the need to escape to get rid of the rest of the ovaries.
  7. Nutrient deficiencies. Trace elements that are in the soil, cucumbers consume quickly. Why they soon begin to lack nitrogen, potassium and phosphorus. With a lack of phosphorus, the leaves become smaller and darker, side shoots grow poorly. With a lack of potassium, the yellowed leaves curl, the ovaries fall off.

The reason that the ovaries die may be diseases. This is bacteriosis, fungi, root rot, mold. Favorable conditions for the development of diseases are high humidity, especially in cold weather, and lack of ventilation.

Cucumbers affected by insect pests also shed their ovaries.

in the greenhouse

There are additional reasons why the ovaries on cucumbers in the greenhouse turn yellow. First, these are uncomfortable conditions:

  1. Very dry air. Cucumbers need air humidity up to 90%. When dry, their leaves evaporate moisture so actively that the roots do not have time to deliver water from the soil. As a result, the ovaries turn yellow and begin to fall off.
  2. Too hot. At temperatures above +30°C, cucumber pollen is sterile, and male flowers become incapable of fertilization. The fruits are not tied.
  3. Shoots are placed very closely. The microclimate in such conditions is unfavorable for cucumbers: shading, inability to ventilate, high humidity, disease outbreaks.

Secondly, the ovaries wither if varieties intended for outdoor cultivation are planted in the greenhouse. That is, those that are pollinated by bees. Insects transfer pollen from male to female flowers. They cannot get into a closed greenhouse, and unfertilized ovaries turn yellow.

In the open field

If cucumbers grow outdoors, good weather conditions are extremely important for them.

Problems arise if the air temperature:

  • + 35 ° C - the ovary ceases to form;
  • +15°C - development slows down, pollen quality decreases;
  • +10°C - growth stops;
  • +8°C - cucumbers die.

Unfavorable for cucumbers and too much difference between night and day temperatures.

Cucumber bushes shed their ovaries even during prolonged rains, when water constantly floods the beds. In addition, cucumbers planted outdoors may not be pollinated during rainy summers due to the lack of insects that do not fly in bad weather.

What to do if the cucumber ovaries turn yellow, dry up and fall off

In most cases, the situation associated with the yellowing of the ovaries of cucumbers can be corrected. The cause that caused violations in the development of the vegetable should be eliminated.

Fertilizer

If the ovaries of cucumbers turn yellow and dry out due to lack of nutrition, it is urgent to carry out foliar top dressing with complex fertilizers: Diammofoska, Ammofoska, Nitrofoska, Potassium Sulfate. It should be remembered that in case of an overdose, the leaves can get burned, so you must strictly adhere to the recommended dosages.

From folk remedies in such a situation, the composition will help:

  • urea - 1 tbsp. l.;
  • wood ash - 3 tbsp. l.;
  • water - bucket.

Sprayed in the evening when there is no sun: the water droplets remaining on the foliage focus the hot rays, causing burns.

If there is a lot of nitrogen in the soil, instead of forming ovaries, cucumbers spend their energy on green growth. In this case, watering with an extract of superphosphate will help. For its preparation, 20 tbsp. l. superphosphate is dissolved in 3 liters of boiling water. Then the mixture is kept in a warm place for a day, stirring frequently. Before use in the garden 2 tbsp. l. hoods are additionally diluted in a bucket of water.

Pollination

Cucumbers are divided according to the type of pollination. There are 3 types:

  • those that are pollinated by bees;
  • self-pollinating hybrids;
  • parthenocarpic hybrids (they do not require pollination).

When grown in a closed greenhouse or on a balcony, varieties that are pollinated by bees will have to be processed manually. Do it with a soft brush. You can pick a male flower and use it to transfer the pollen to the female.

The second way is to attract bees to the site. This is done by spraying the plantings with sugar or honey water. The solution must be weak. Sometimes he is bred boric acid- grams of acid per liter of liquid. Another way is to put containers with sweet solutions next to the cucumber beds.

You can use the drugs "Bud" or "Ovary".

Petunias, borage, sunflowers, jasmine are well attracted to bees. The greenhouse should be kept open as much as possible.

Soil drying

With waterlogged soil, cucumbers bloom, but ovaries do not form. In this case, the plantings are not watered for several days. After a while, the leaves begin to wilt. In such a situation, plants intensively form many female flowers.

The empty flowers fall off on their own. If this does not happen, you should carefully remove them.

pasynkovanie

If there are too many stepchildren on the cucumbers, they are removed. Remove all lower shoots up to 5 leaves. On the rest, 2 leaves are left, the rest is cut off.

Sometimes the whips begin to violently stretch upwards. In this case, you need to pinch the top. The plant immediately throws out lateral shoots, on which female flowers are formed in abundance.

Dropping

They resort to it if the stem is rotten. The roots stop delivering nutrients to the ovaries, as a result of which they turn yellow and fall off. Then its lower part is lowered to the ground and sprinkled with soil. New roots form on the stem, which begin to fully nourish the plant.

Until the cucumbers have gained strength, it is better to remove most of the ovaries. Affected shoots are fed with mineral fertilizers.

Insect control

If the cucumber drops its ovaries due to the attack of harmful insects, the plantings are processed:

  • infusion of onion peel;
  • ammonia (3 tablespoons per bucket of water);
  • a mixture of superphosphate (100 g) and potassium chloride (50 g);
  • a solution of soda (1 tbsp.) And grated laundry soap (1/4 piece) in a liter of water;
  • ash (300 g), boiled for 30 minutes in two liters of water and diluted in 10 liters of liquid.

Chemical agents are effective, but they are used only before fruiting begins. These are Aktara, Commander, Alatar.

Biological products are less harmful: Biotlin, Fitoverm, Kleshchevit. However, they also have recommendations on the timing of the removal of cucumbers after processing the beds.

How to prevent yellowing of the ovaries

Cucumbers are a crop that is not too difficult to grow. However, some requirements must be considered before planting. So, you need to consider:

  1. Variety selection. Self-pollinating varieties are suitable for open ground. In protected ground or on a balcony, it is better to plant hybrids: self-pollinated or parthenocarpic.
  2. Association of varieties. It is useful to plant pollinating cucumbers next to plants that require mandatory pollination.
  3. Choice of location. It should be a draft-free sunny area with well-fertilized soil. The place for planting cucumbers is changed annually.
  4. Seed selection. Seeds collected in the previous year form predominantly male flowers, and that planting material, which was prepared 3 years ago - for women. Therefore, older seeds should be chosen for planting.
  5. Seed preparation. To get more female ovaries from fresh seeds, their preheating or hardening will help. Seed dressing with potassium permanganate will protect against possible diseases.

So that cucumbers do not shade each other and there is air movement around them, no more than four bushes are planted per 1 m2. And for tall varieties such an area is required for one bush.

Cucumbers planted in open field must be protected from adverse conditions. In hot weather, the beds protect from the sun by equipping a canopy.

The same shelter will close the plants from heavy rains. If the summer is damp, you need to dig grooves near the cucumber beds to remove moisture.

On cold nights, cucumbers are covered with a film or agrofibre.

If necessary, warm the air in the greenhouse put containers with warm water. Mulching retains heat well in the soil.

To prevent cucumber plantings in the greenhouse from overheating in hot weather, it must be constantly ventilated. It also saves high humidity.

important and proper care for cucumbers. Watering - only warm water. Ideally, its temperature should be the same as the temperature of the soil. But not below 23 C, because cold water stimulates the formation of male flowers. Water cucumbers at least three times a week, preventing the soil from drying out.

Normally, the roots grow 30–40 cm deep, but if the soil is not shed deep enough, they are located close to the surface. In this case, the roots are more likely to suffer from heat or cold.

Fertilization of cucumber plantings should be carried out in the system. Useful complex top dressing with mineral compounds: "WMD", "Azofoskaya", "Calcium nitrate", "Urea". Fertilize cucumbers at least four times per season. If necessary, this is done every 10 days, alternating factory preparations with folk remedies (ash, herbal infusions, mullein).

Everyone knows that sometimes cucumbers in a greenhouse begin to turn yellow. What are the reasons for this? What can be done in order to get a crop? A scheme for planting cucumbers in a heated greenhouse. So, why do cucumbers turn yellow in a greenhouse?

There are three main reasons.

Cucumbers are moisture-loving plants, so they need to be watered regularly. To prevent cucumbers from turning yellow, use cold water for watering. Stand up for water. Increase watering during fruiting.

In addition, you need to moisten the ground well so that the roots of the cucumbers develop deep into, and not from above. If you do not water the plants at least a few times, they will begin to turn yellow, and the new ovary will also turn yellow. The weather is often the reason why the plant turns yellow. Due to the cold and wet weather caused by frost, cucumbers are often damaged.

If the ovaries begin to rot, immediately remove the faded flowers and apply potassium permanganate to the cut. To prevent bacteriosis, spray - for this purpose, 1% Bordeaux liquid is used. If a yellow spot appears on the foliage, this indicates a lack of potassium, and light green indicates a magnesium deficiency.

Thus, cucumbers need to be fed. In addition, the development of the plant may be slightly disturbed due to the lack and scarcity of the soil. Make sure that there are no overdoses of fertilizer, because of which, as a rule, seedlings and their fruits turn yellow.

As soon as the cucumber seedlings are planted and after the harvest is completed, be sure to apply manure to the soil. And during the growing season, use complex mineral fertilizers (they should include phosphorus).

Fungal diseases and pests

Enough known disease plants today is powdery mildew. If the leaves are covered with light spots, gradually increasing in size, then this indicates an infection. The leaves begin to dry and turn yellow.

How to eliminate this trouble? In this case, it is necessary to use fungicide preparations. There is another common cucumber disease - uzaria wilt. Because of this dangerous fungal disease plants begin to die in the greenhouse.

Special preparations will help get rid of this pest. Root rot. Cucumber leaves turn yellow at the very bottom. This usually happens through significant temperature changes during the day or night.

Cause - use is enough cold water for watering. The weakened plant is the first to fall ill, then the infection is transmitted through the earth to other crops.

Peronosporosis - the cause of the destruction of the crop

Table of diseases and pests of cucumbers. In addition, you need to talk about downy mildew (downy mildew). This disease, common in cucumbers, appears in the greenhouse when high humidity air and soil. The affected fetus shrinks and turns yellow.

Often the entire crop is destroyed. How to understand that plants are sick? On the leaves (at the very bottom) green spots of an acute-angled shape may appear.

Means to eliminate peronosporosis will help cure the disease. Peronosporosis is the main disease of cucumbers in the greenhouse, in which the leaves begin to turn yellow. The plant is overloaded with ovaries. In a greenhouse, plants are able to develop quite quickly.

If you remove new shoots in a timely manner, you can prevent a delay in the development of greenery. But failure to comply with this rule may result in the appearance of underdeveloped, small and yellow fruits. In addition, sometimes fertilization is insufficient.

This is what happens when the greenhouse uses hybrid variety requiring artificial pollination. Cucumbers turn yellow in the greenhouse natural way when fully ripe, however, only green fruits are used for food. These are the main reasons why plants turn yellow in greenhouses. After determining the reason, you can choose best method fruit preservation.

Why do cucumbers turn yellow in a greenhouse?

Appeared more than 6 thousand years ago, the cucumber is still one of the favorite crops of gardeners. This fruit is not only tasty, but also has wide application in medicine and has dietary properties.

Cucumbers are easily digested by the body, regulate bowel function and remove excess cholesterol. And thanks to the presence of potassium, they improve the functioning of the heart and kidneys. Cucumbers are grown in almost every garden.

However, they require special care, and, if something is not respected, they begin to turn yellow. Therefore, today in our article we will tell you why cucumbers turn yellow in a greenhouse and what needs to be done to avoid this.

Why do cucumber leaves turn yellow?

Diseases and insects are two reasons why cucumber leaves turn yellow. Diseases are the result of non-compliance optimal conditions for growing cucumbers. To avoid them, it is necessary to properly water and fertilize the plants, to avoid temperature changes.

However, the "chemical" fruits collected during this period will have to be thrown away. With a sudden wilting of a plant, it must be completely removed, and with it the infected soil from the hole where it grew.

How to properly water cucumbers?

One of the main reasons why cucumbers turn yellow in a greenhouse is irregular watering and the use of cold water. If you want your cucumbers to grow healthy, water them properly. It is important that the cucumber soil is always moist, but never turn it into slush.

Water for irrigation should be settled and heated in the sun. In the heat, watering should be daily, in the evening, followed by careful loosening of the soil. If cold weather is expected at night, then watering should be carried out in the morning.

How to properly feed cucumbers?

At the beginning of the growing season, the cucumber needs more nitrogen, during the period of growth in a loop - potassium, during fruiting and the appearance of new growths, nitrogen is again required. Therefore, improper feeding can be another reason why cucumbers turn yellow in a greenhouse.

The main thing to remember is that plants need little, but proper feeding. Cucumbers have weak roots that are not able to penetrate deeper than 20 cm, so plants are especially sensitive to soil properties. Fertilize it with manure, decayed garbage, straw, peat or sawdust.

Enrich the compost with nitrogen and fertilize locally. Do not forget about mineral fertilizers. Over the summer, you need to properly feed cucumbers no more than 5 times. The first feeding is carried out at the beginning of flowering.

The next four are during the fruiting period. They use chicken manure and mullein, but they can also be replaced with ready-made top dressings. When warming comes to replace a long cold snap, ammonium nitrate is needed for greenhouse cucumbers.

Cucumbers are fed by placing fertilizer in the furrows, after which they are watered. During low temperatures, the plant is supported by foliar top dressing.

Cucumbers love warmth.

When choosing a place for planting cucumbers, you need to be guided by such a factor as the absence of a draft. Since drafts and sudden changes in temperature can cause the leaves of cucumbers to turn yellow. You can open the greenhouse only when the temperature inside exceeds 30 ° C.

Moreover, you need to open the doors on each side in turn. Opening from both sides at once, you will allow the appearance of a draft.

How to get rid of pests on cucumbers?

There are a lot of insect pests, as a result of which cucumbers turn yellow in the greenhouse. This is a sprout fly, and a cucumber mosquito, and aphids, and a spider mite.

All these insects or their larvae feed on the leaves, stems and fruits of cucumbers, which inevitably leads to drying and death of the plant. In order to get rid of them and save the plant and crop, it is necessary to choose the right pest control agent. But do not forget - after treating the plant with one or another drug, all grown fruits must be removed and discarded. It is extremely unsafe to eat cucumbers that have been contaminated with drops of pest control agents.

Why do cucumber ovaries turn yellow in a greenhouse?

The question of why cucumbers turn yellow in a greenhouse worries every gardener and gardener who grows them indoors. There may be several reasons for the yellowing of leaves, ovaries and cucumbers grown in greenhouse or greenhouse conditions. If we exclude the attack of pests and the development of any diseases, then there are several reasons for the yellowing and drying of greens.

Plants are too densely planted. They do not have enough food area, so they cannot feed all their numerous offspring. For each particular variety or hybrid, this information is indicated in the description on the bag. Many novice vegetable growers allow cucumbers to grow arbitrarily, it seems to them that by pinching certain lashes, the yield will decrease.

As a result, thickets of intertwined vines with large leaves form in the greenhouse, through which sunlight breaks through with difficulty. In such conditions, not some of the greens, but almost all, can dry out.

The formation of cucumbers is simple: from the sinuses of the lower 3-5 leaves, you need to pluck the stepchildren completely. The upstream shoots should be pinched off after the second leaf.

Stepsons of the second order, which will form from the axils of the leaves of the secondary lash, should remove the growth point after the formation of the first leaf. If, at first, cucumbers, as a rule, are fed with fermented manure, i.e. predominantly nitrogen, then with the onset of fruiting, the needs of plants change, they already require both potassium and phosphorus.

Therefore, superphosphate and ash must be added to infusions of grass or mullein. You can use complex fertilizer, for example, "Kemira" or similar.

4. Overgrown fruits are not removed in a timely manner. Overgrown fruits (or one fruit) greatly delays the development of the remaining ovaries. For bunch cucumbers, the presence of overgrowth, even an extra 2 hours on the lash, affects the greens.

Something has changed in the growing conditions, so the cucumber fruits that have begun to grow have partially turned yellow.5. The reason for the yellowing of cucumber ovaries in the greenhouse may be their poor fertilization. Since the pollen of cucumber flowers is sticky, they are pollinated by insects, mainly bees.

In small greenhouses, you can pollinate plants manually, and in large ones you need to put beehives with bees, since manual pollination of flowers requires very high labor costs and drastically reduces the quality and quantity of the cucumber crop. If it is not possible to put hives in greenhouses, you can lure bees by feeding syrup with the addition of 5% yeast (yeast with syrup is boiled to avoid fermentation). The syrup is prepared from 2 teaspoons of sugar and 1 teaspoon of water and is poured daily into the feeders for 100-200 g. syrup.

It is very important to remember that cucumber pollination occurs from 6 to 10 am, it is at this time that bees should have maximum access to plants (open transoms, doors, etc.). The natural process of yellowing fruits is their full ripening. We use greens for food.

How disappointing it is when cucumbers turn yellow in a greenhouse. What is the cause of this disaster and what can be done to save the day and still get a good harvest? If the yellowing of the leaves is not accompanied by wilting, the cause is most likely a lack of nutrients. Why do the fruits and leaves of cucumbers turn yellow? Experts identify several of the most common causes.

Non-compliance with the technology of growing cucumbers in greenhouses

Cucumber is a very moisture-loving plant (like pepper), so you should not neglect the rules for watering this vegetable. These rules are simple: so that the cucumbers do not start to hurt and turn yellow, the water for irrigation should not be cold (watering from a hose is not good). Water should be defended.

During the fruiting period, watering should be increased. In cool weather, plants are watered during the daytime, and on sunny warm days - in the morning. If the days are hot, then in the morning watering is done only refreshing, and in the evenings - normal.

The depth of the moistened earth should be sufficient so that the root system of cucumber plants develops in depth, and not superficially. The regularity of watering is crucial: it is only a few times to go astray and skip watering the plants, and this will immediately affect the quality of future fruits. So, the lack of moisture entails the yellowing of the plant itself and the new ovary of cucumbers. Yellow spots indicate a lack of potassium, and light green ones are a sign of magnesium deficiency.

This means that cucumbers need to be fed. Weather conditions often become the reason why cucumbers turn yellow. Cold and wet weather caused by late frosts can damage plants.

If rotting of the ovaries appears, it is urgent to remove the already faded flowers and treat the cut with potassium permanganate (solution). To prevent further bacteriosis, spraying is carried out with either 1% Bordeaux liquid or 0.4% copper oxychloride.

It is worth noting that peppers can also turn yellow and lose leaves if they are in temperature conditions up to +120 ° C for a long time. The composition of the soil is crucial. The lack of nitrogen and the poverty of the soil - that's common cause why the development of the plant is disturbed.

It is important to ensure that there is no overdose in the amount of fertilizer, which, in turn, leads to oppression and yellowing of seedlings and their fruits. Before planting cucumber seedlings and after the harvest is harvested, mandatory manure is introduced into the soil. And during the growing season, fertilizing with complex mineral fertilizers containing phosphorus, fluorine and potassium, and liquid mullein is considered mandatory.

Damage to plants by various diseases or pests

Powdery mildew. If light spots resembling white plaque were found on the leaves, gradually increasing in size, then this is a sign of infection. The leaf dries and turns yellow.

How to deal with this trouble? If you do not worry about measures to destroy powdery mildew, next season it will certainly make itself felt.

The fungicide preparations Topsin, Bayleton, Karatan will help. The main cucumber disease in our area, in which the leaves turn yellow, is downy mildew (peronosporosis). You should also pay attention to varieties of cucumbers that are resistant to this disease. Fusarium wilt. A dangerous fungal disease that causes the death of cucumbers in a greenhouse.

Penetrating into the capillaries of the plant, the spores of this fungus completely block the access of nutrition to the fruits and leaves. In greenhouses where infection has occurred, a complete replacement of the soil is required. In addition, you need to regularly change the variety of plants. Aphid gourds.

Special preparations cope well with these pests: Belofos, Arrivo and the like. Root rot. The leaves, both in young plants and in adults, begin to turn yellow from below. This is caused by significant temperature differences between day and night.

The reason may be watering too "cold" water. Weakened plants fall ill first, then infection through the soil begins to be transmitted to other cucumbers.

Preventive treatment (twice) with Previkur in the root area can prevent this unpleasant disease. Downy mildew (pernosporosis). This disease, common in gourds and cucumbers, appears in greenhouses in conditions of high humidity of air and soil, against the background of dense planting of seedlings.

Affected fruits shrink and turn yellow. The first signs of damage may appear immediately with the onset of the fruiting period. In this case, the crop can be completely destroyed. How to determine that the plants are sick?

Sharp-angled, dark green spots appear on the lower leaves. Preparations for the fight against pernosporosis - Bordeaux mixture or copper chloride oxide (for the first treatment), Bravo, Aviksilom (for the second treatment after 7 days).

When cucumbers turn yellow in a greenhouse, what to do is the first question that gardeners have. First of all, you need to determine why the problem occurred. This can be a violation of agricultural technology, and a lack of nutrition, and pest infestation.

Experts identify 5 reasons due to which there is a change in the color of the tops of cucumbers in the greenhouse.

The leaf turns yellow if:

  • improper watering;
  • lack of lighting;
  • lack or oversaturation of the soil with nutrients;
  • infection with pathogenic bacteria and fungus;
  • the presence of pests on leaf plates.

In this situation, the green mass on the lower part of the plant most often suffers. If the cucumbers turn yellow in the ovary, then the reason lies in problems with pollination or plant overload. To solve it, it is necessary to remove some of the embryos and flowers. The answer to the question of why the fruits of cucumbers turn yellow in a greenhouse is frost. As a result of a sharp temperature drop, a young crop could die or be seriously injured. This also applies to flower stalks. In addition to these problems, the ovary is affected by an imbalance in nutrients, improper agricultural practices, and pest infestation.

When figuring out why the fruits turn yellow, you should pay attention to plant care. With proper agricultural technology, a change in color causes overripeness. It leads to the fact that the cucumbers outgrow in size, the peel acquires a yellowish tint, the flesh becomes less crispy. These non-hybrid cucumbers are suitable for seed collection.

Knowing why the tops fade in the greenhouse and how to deal with it, you can avoid serious problems in a timely manner.

Why cucumbers turn yellow in the open field

The reasons why cucumbers turned yellow in open ridges may be similar to greenhouse ones. A number of factors affect the color change of the cucumber leaf plate.

  1. Wrong watering. The lack of moisture affects the loss of leaf turgor. Yellow dry spots form on it, which lead to the withering of the entire plate. If watering is excessive, then the root system begins to rot, which also causes the leaf to turn yellow.
  2. Burn formation. When watering in sunny time, the drops remaining on the leaf plates dry out quickly, which leads to a burn.
  3. Inappropriate neighborhood. Cucumbers don't grow if the wrong place is chosen for them. Bad predecessors are pumpkin, squash, watermelon. After them, pathogenic bacteria remain in the soil, and a shortage is also formed. useful substances needed by cucumbers.
  4. Place. The reason may be hiding in the wrong place. Excess sun, strong drafts, swampy soil are not suitable for a growing seedling.

Not only leaves, but also the ovary of cucumbers can turn yellow. This moment is most often associated with:

  • excessive formation of the ovary;
  • pollination problems;
  • violation of the rules of agricultural technology;
  • temperature difference;
  • shortage of fertilizers.

The answer to the question why the cucumber inside turns yellow is:

  • lack of oxygen in the soil;
  • insufficient soil moisture;
  • defeat by infections (peronosporosis, fusarium wilt).

Effective ways to combat yellowing

It is important not only to know why cucumbers turn yellow on the ridges and in the greenhouse, but also what to do in such a situation. Often, the solution to the problem requires changing the conditions for keeping plants or treating them with disinfecting preparations.

Features of agricultural technology

Violation of growing conditions often leads to the fact that cucumbers turn yellow and dry leaves, ovaries or the fruits themselves. For this vegetable, it is important to make the conditions as optimal as possible. This applies to ridges under the film and in unprotected soil. In order for vegetables to grow well, they need warmth, timely watering and top dressing. If yellowing of cucumbers is noted in the greenhouse, what to do depends on what the problem is.

Often, the reason is hidden in untimely watering. As a result of a lack of moisture, the soil overheats, the leaves begin to turn yellow, then they dry. Cucumbers are moisture-loving plants. But it is important to follow a number of rules.

  1. Water quality. For cucumbers, it is recommended to use settled water.
  2. Temperature. To prevent cucumbers from turning yellow, use heated water.
  3. Regularity. Young cucumbers require regular watering. During the heat, watering is carried out daily in the evening. In case of frost, the amount of water is reduced. Watering is transferred to the morning.

Another important factor one thing to consider before planting is heat. Low temperatures can be the reason why cucumbers dry in the greenhouse. To solve it, it is important that a constant temperature is maintained in the room. If the air is too hot, organize ventilation.

Top dressing and fertilizer

Often the reason why cucumber leaves turn yellow is improperly prepared soil. Especially this problem felt when. In such cases, it is not possible to change the soil annually or enrich it naturally. Accordingly, the question arises of how to feed the cucumbers in order to avoid the appearance of yellow leaves or ovaries.

If cucumbers have already been planted, then they must be fed during the season with potassium, wood ash and other mineral compounds. With a lack of nitrogen, urea helps well from fertilizers.

Experts recommend planting plants in prepared beds. For this, mullein is first introduced into them. It is important that only rotted manure is used. Fresh leads to a burn of the roots. From folk methods top dressing with infusion of chicken manure shows high efficiency.

Pest and disease control

The reasons why cucumbers turn yellow in a greenhouse or in unprotected ground include infection with pests or other diseases. Experts note a wide variety of pests that lead to a change in the color of the tops or damage to the crop.

  1. Bacteriosis. The defeat of plants is associated with a violation of the rules of agricultural technology. Excess moisture leads to yellowing of the ovary. During the formation of young fruits, a yellowish coating forms on them, then warts and ulcers form. The plant ceases to bear fruit and dies. Bordeaux mixture is used as a treatment against bacteriosis. In order not to turn yellow leaves and fruits, it is enough to spray the plants and remove already wilted leaves and affected cucumbers. Subsequently, excess moisture in the soil should be avoided.
  2. Powdery mildew. The disease is characterized by a change in the color of the leaves. They first turn yellow, then dry. The disease affects plants, both in the greenhouse and in the open field. Fungicides are used for control.
  3. Fusarium wilt. In the greenhouse, yellowing of cucumbers is associated with this disease. Fusarium is transmitted through the soil and leads to the loss of most of the crop. The fight requires the processing of soil, plants and all equipment that is used for work. Yellowed tops, fruits and plants are completely removed and burned.
  4. Aphid. The pest often infects plants under a film cover or in open ground. You can find it on the back of the sheet. For the fight, special drugs are used. Also, landing next to the beds of garlic, fennel, marigolds, and mint effectively helps against aphids.
  5. Corner spotting. The disease is characterized by the appearance of yellow or whitish spots. The tips of the leaf plates dry out, curl. The disease actively progresses at high humidity and high temperatures. Greenhouse plants are more susceptible to it. For the fight, 1% Bordeaux liquid is used.

In order for the cucumbers in the greenhouse not to turn yellow, it is necessary to regularly carry out preventive work against the spread of diseases and pests. They are based on a set of rules.

  1. Disinfection. Before planting the plants, the soil must be disinfected. For this, chemicals or a solution of manganese are used.
  2. Prevention of pests and diseases. To prevent diseases from being transmitted to a new crop, all dried greens are removed from greenhouses during the harvesting period.
  3. Weeding. In a greenhouse and on open ridges, it is necessary to regularly weed the soil. Weeds are not left in the aisles, but are disposed of in compost heaps or burned.
  4. Removal of affected plants. If the leaves turn yellow and dry, they must be removed immediately. Also come with the ovary or fruits.
  5. Compliance with the rules of agricultural technology. The greenhouse maintains a constant temperature, avoiding drafts and excess moisture or drying out of the soil.
  6. Timely pest control. Planted seedlings are treated against pests several times a season.

Compliance preventive measures, as well as knowing the reasons why cucumbers turn yellow, allows you to avoid problems in a timely manner and get bountiful harvest both indoors and outdoors.