What to do with yellow leaves on cucumbers. Downy mildew and root rot

Cucumbers are a delicate culture. To grow cucumber seedlings, you need to spend a lot of effort. Therefore, it is extremely disappointing when the leaves, yesterday still bright green, suddenly withered away.

This can happen at any stage of the plant's vegetative development. It is especially annoying when the leaf begins to turn yellow during flowering, or at the very beginning of fruit ripening.

What to do if cucumber leaves turn yellow?

We must try to find the cause. This is not easy, because there are a lot of factors that cause yellowing of leaves in cucumber seedlings.

• Watering errors
• nitrogen deficiency
• Diseases
• Pests
• lack of light
• end of season

Watering errors

It would seem that a simple matter - watering. Unroll the hose and pour as much as you like. But in the case of cucumbers, this is a whole science.

In hot, dry summers, you need to water daily and correctly.

Under no circumstances should temperature fluctuations be allowed. If the street is + 30 ° C, then the temperature of the water for irrigation should be the same.

Watering cold water leads to yellowing of leaves and even to disease of plants!

It is more difficult to follow this rule when growing cucumbers in open field: in an unfavorable summer, rains and dew will do their bad deed. But in sunny warm weather, cucumbers under open sky watered in the same way as greenhouses.

Water should be poured strictly under the root, without touching the leaves. Droplets that fall on the plant plate act like lenses in the sun, concentrating sunlight in one place and causing a burn in the form of a yellow spot.

Cucumbers growing in a greenhouse are also not immune from this. Vapors on the covering material are converted into drops, fall on the leaves and the same thing happens as with plants in the open field. This circumstance must be taken into account when equipping a greenhouse and planning a scheme for planting vegetables.

Water cucumbers in the evening or in the morning.

If the summer is rainy, then you need to water it in the greenhouse 2-3 times a week, and stop it altogether in the open field. Unfortunately, in damp cold weather, it is impossible to grow a good crop of cucumbers without a greenhouse. This is a very thermophilic culture.

nitrogen deficiency

Yellowing of the leaves is one of the signs of a lack of nitrogen.

To establish whether this is so, one must remember how to equip a bed for cucumbers:

1. whether the soil was dug along with rotted manure;
2. was included in the right amount humus or compost;
3. whether the acidity of the soil has decreased.

Even if all these conditions have been diligently observed, cucumbers still need to be fed in the process of growing and ripening. Especially during the development of shoots.

The first dressing is done in the phase of 3-4 leaves. Then, when it's time for flowering and fruit set. And, of course, during the fruiting period, if you want to impress your neighbors with the size of the crop.

It is better to use purchased liquid basal top dressing. The exact ratio is indicated on the package: how much drug, how much water.

But do not be too zealous: cucumbers are very sensitive to fertilizers.

The main rule for all crops is better to underfeed than to overfeed!

During active fruit ripening, it is better to feed cucumbers using natural ingredients. For example, the so-called Herb tea(infusion of herbs).

Preparing it is very simple: you need to collect all kinds of weeds, chop them finely and pour water over them. For 10 liters of water 2 kg of green mass. All this is fermented for one week, and then used for root dressing of cucumbers.

Diseases

The most terrible "beast" for a cucumber is peronosporosis, or powdery mildew.

Spores of infectious fungi overwinter in plant debris. To prevent this disease, it is necessary to carry out preventive measures since the fall: dig deep into the soil, carefully remove plant debris, and disinfect with special preparations.

Plants can get sick both at an early stage and during fruiting. The infection begins at the bottom of the leaf and gradually moves up, affecting the entire culture.

First, yellow specks appear on the leaves, which increase in size, merging into one unpleasant spot. The plates begin to dry out, the plant dies.
Unfortunately, when the first signs of this disease appear, it is already very difficult to fight. Powdery mildew is an ailment that is easier to prevent than to cure.

But if, nevertheless, such a disaster happened during the growing season of cucumbers, you can try to spray the plants with special solutions. It is better to buy certified drugs with detailed instructions by use.

On the next year from planting cucumbers in this place will have to be abandoned.

Pests

Perhaps cucumbers began to devour pests - spider mite or whitefly.

whitefly - very small butterfly white color, which can get on vegetables along with seedlings.

spider mite planted both outdoors and in a greenhouse. Having settled on the lower part of the leaf, he envelops it with a barely visible cobweb.

Despite their microscopic size, these pests cause yellowing and death of the entire cucumber lash. The spider mite can also infect the culture with another disease - gray rot.

Noticing such insects, first of all, you need to cut off and burn the affected leaves. From improvised means, you can use tobacco dust or ammonia. But it is better to buy special preparations, the action of which is aimed at combating these particular pests.

Lack of sunlight

In the midst of fruiting, the lower leaves may turn yellow. This happens when too thick tops do not allow sunlight to sufficient illuminate the plant. Simply put, the bottom sheets do not get lighting. In this case, you just need to carefully cut off the withered leaves.

In the future, you should try to plant cucumbers not too often, so that there are no dense thickets.

end of season

The tops begin to turn yellow at the end of fruiting, when the crop is already on the wane. This is normal condition. The lower leaves die off, and only top part the whip continues to turn green.

If you want to slightly extend the harvest time, then you can try the following: cut off the lower plates, pull the green part of the stem to the ground and “dig in” a little. There may be no new ovaries, but the old ones will ripen safely.

I wish you healthy plants and a rich harvest. Now you know why cucumber leaves turn yellow and you can help your plants.

Sincerely, Sofia Guseva.

Every gardener is well aware of how much effort it takes to grow a good crop of cucumbers. And if the cucumber leaves turn yellow, what to do becomes the main concern of the gardener.

As you know, this culture is very whimsical, as it requires both a large amount of water and sunlight. There can be many problems with cucumbers. Everything starts with right choice seeds, not all of which, after sowing, will turn into plants, and after the trouble they deliver leaves and flowers with missing ovaries. In general, you have to work hard to get a decent crop of cucumbers, this also applies greenhouse cultivation, and the usual, that is, in an open garden.

Only when proper care can really be achieved good result. A big problem for many - both beginners and experienced gardeners, is the yellowness that appears on the leaves. There can be a lot of reasons why the leaves of cucumbers turn yellow, but it will help to determine it. appearance. The leaves may turn yellow at the edges or completely dry out and curl up. This happens due to the effect various factors, and most problems are easily solved if you act correctly and in a timely manner.

The main reason for the yellowing of the leaves in cucumbers is the lack of sunlight.

Water and sun

As mentioned above, only the right medicine can help with yellowing leaves on a cucumber. It is possible to determine what exactly a plant needs only if you find out the root cause of yellowness.

Let us consider in more detail what to do if yellow spots appear on the leaves of cucumbers. When the tips of the leaves turn yellow on a cucumber that grows in the ground, the problem can be solved very quickly and without the use of chemicals. Most often, the main reason why the leaves of cucumbers in the greenhouse or in the beds turn yellow is the lack of sunlight. You should not worry about this, as it is enough just to remove the damaged leaves.

It is worth noting that cucumbers are very fond of water, so they must be watered in a timely and thorough manner. With a lack of moisture, the roots of the plant begin to look for a source of water and get out to the surface. This leads to their drying, which affects the condition of the entire cucumber as a whole. It doesn’t matter at all where the plant grows, in an open garden or in a greenhouse, it needs a sufficient amount of water, and if it is not enough, this leads to the fact that the cucumber leaves turn yellow and dry.

With a lack of moisture, cucumbers begin to dry

Cucumbers are very whimsical plants. They react negatively not only to the lack of moisture, but also to its excessive amount. So, an excess of water and too active watering also lead to damage to the leaves and root system. The green part of the plant may turn yellow and rot.

fungus and pests

The cause of the problem with the leaves can also be one of the fungal diseases that cucumbers are quite susceptible to. First of all, yellow spots appear on the leaves of cucumbers, in some cases brown, after which they grow and lead to leaf abscission.

With furaziosis, the plant will not respond normally to watering. The cucumber looks like it hasn't been watered in a couple of weeks. This often becomes noticeable after the rainy season begins, that is, when the heat is abruptly replaced by low temperatures and high humidity.

Experienced gardeners know that plants must be carefully protected from pests. They often become the reason why the leaves of cucumbers in the garden turn yellow. This occurs against the background of a lack of nutrients, and the tips of the leaves primarily suffer. Pests suck out many of the nutrients it needs from the plant. For example, the leaves may turn yellow against the background of a lack of potassium and magnesium.

In order not to think about how to deal with the fact that the leaves of cucumbers turn yellow, it is better to prevent such a development of events, for which it is necessary to process garden plants from pests and fungi. To do this, there are a lot of different products that are diluted in water, and spraying is carried out with this solution.

Cold exposure

Most often, cucumber leaves turn yellow at the edges if they grow on open beds. Experts say that this is a signal for the gardener, saying that the plant is too cold.

If the weather forecast indicates that an extreme drop in temperature is planned at night, it is worth covering cucumbers and other plantings from the cold. To do this, you can use a plastic film, under which bottles of warm water are placed. These "warmers" can be placed directly in the middle of the beds, as they will not harm the cucumbers.

It is worth noting that novice gardeners often begin to panic about why cucumbers turn yellow in the garden. However, like all other representatives of flora and fauna, cucumbers tend to age. For this reason, yellow and dry leaves can only be the result of a natural natural process.

During cold weather, it is worth covering cucumbers plastic wrap

Cucumbers in the greenhouse and on the balcony

Indoors, the plant may not have enough of what it receives on the street, so here the leaves of cucumbers can turn yellow especially intensively. As for what to do if the leaves of cucumbers in the greenhouse turn yellow, in order to avoid such troubles, it is necessary to fertilize the ground well before planting seedlings.

It should also be noted that cucumbers that grow in pots on the window may also need sunlight, especially if the window faces north or east.

Experts say that for home-grown cucumbers, high-quality soil with enough nutrients plays an important role. Many perceive this as a signal for the abundant use of all kinds of fertilizers, which cause great harm to plants. The thing is that cucumbers are very whimsical, so they definitely won’t like it if there is too much of one or another substance in the soil.

This happens, for example, with nitrogen. If there is too little of it in the soil, this leads to the fact that the leaves of the cucumbers in the greenhouse turn yellow. In the event that there is a lot of this element, yellow spots will appear on the plant. By the way, an excess amount of nitrogen is common cause appearance of fruits irregular shape.

For cucumbers, high-quality soil with enough nutrients plays an important role.

To avoid such a problem, when the leaves of cucumbers turn yellow and dry, you need to use high-quality fertilizers, which are sold in specialized stores in the form of balanced mixtures. This will avoid yellowing of the leaves on the cucumbers.

How to deal with yellowness on the leaves?

Of course, it will not be possible to save the already damaged leaves of the plant, but it is quite possible to avoid the further spread of the problem, and even more so the complications.

First of all, you need to take care of the quality watering of the plant. If there are problems with water in the region, it is worth using mulched soil, that is, mixing ordinary soil with peat, straw, humus and chopped tree bark so that the moisture lasts as long as possible. By the way, cucumbers cannot be planted on the same bed for 2 consecutive seasons. This leads to a poor-quality crop and the occurrence of a fungal disease.

Any plant responds to timely top dressing with a rich harvest. Cucumbers are no exception. Why, how, when and how to feed cucumbers? The answers to these questions and their implementation in practice will delight you with a good harvest of cucumbers.

Why cucumbers need to be fertilized

To get the expected yield of cucumbers, they need to be fed in a timely manner, especially if they grow on poor soil. Cucumber is a crop characterized by an increased growth rate, as well as fruit ripening. What can not be said about its root system - it is rather weak. The fee for mistakes in the process of growing cucumbers is quite large, but it consists in the loss of not only the quantity, but also the quality of the fruit. To achieve constantly abundant fruiting, it is necessary to provide the cucumber with three main minerals: potassium, nitrogen and phosphorus.

Cucumber needs three minerals for full development: potassium, nitrogen and phosphorus.

Video: root and foliar feeding of cucumbers

How to feed cucumbers according to all the rules

Behind summer season in normal soil, a cucumber requires no more than 4 dressings, which are mineral and organic, and according to the method of application - root and foliar. Which method to choose, each gardener decides for himself, however, there is a single formula for their alternation, which is recommended for everyone to follow. Root top dressing especially important during hot summers when root system plants are well developed and need additional trace elements. They must be applied to moist soil (after heavy rain or heavy watering).

Foliar top dressing should be resorted to if the summer is cool and cloudy. Under such conditions, it is difficult for the roots to cope with the absorption of nutrition, so the treatment of leaves with fertilizer from a spray bottle is perfect solution. Foliar top dressing is carried out in small doses on a cloudy day or evening. The most important thing is to spray the solution with tiny drops over the entire surface of the leaves. The longer the fertilizer stays on the leaves, the more the plant absorbs nutrients.

Foliar top dressing is needed if the summer is cool and cloudy.

If the cucumber leaves turn yellow

If the cucumber leaves begin to turn yellow, you need to sort out the problem before going to the store for a life-saving medicine. Each case needs an individual approach.

First of all, you need to establish the cause of the yellowing of the leaves.

Yellow leaves are the first sign that the plant is missing something.. Several reasons for the appearance of yellow leaves on cucumbers:

• If the lowermost leaves turn yellow, this indicates a lack of light. Perhaps the plants are too densely planted, and it is enough to thin them out.
• If the leaves not only turn yellow, but also curl, then the reason lies in uneven watering. For example, an excess or lack of moisture. In hot summers without rain, cucumbers must be watered every day. If you take a handful of earth from a depth of 10 cm, you can easily determine whether your cucumbers receive enough moisture: a lump does not form after squeezing in the palm of your hand - there is not enough moisture; holds tightly and does not fall apart - the cucumbers are too flooded.
• If yellow spots appear pointwise and spread throughout the plant, then it is infected with a fungal disease. In this case, foliar top dressing from the following solution helps a lot: 20 grams of laundry soap and 30 drops of iodine are taken for 1 liter of milk. It is necessary to spray daily in the evening until 3 healthy leaves appear, and then every 10 days. Or apply a fungicide that suppresses the fungal flora on the plant.
• Another reason for yellowing leaves is pests. Spider mites or whiteflies suck out all the juices from the leaves. The leaves gradually turn yellow and die off, therefore, the plant receives insufficient nutrition. It is difficult to overcome a whitefly or spider mite: it may take a week or more. For spraying it is necessary to use insecticides. In the garden store, as a rule, there is big choice insecticides. It is better to buy several at once, since both the spider mite and the whitefly quickly get used to one drug, so they must be alternated every 2 days.

The first top dressing in open ground or in a polycarbonate greenhouse

Cucumbers that grow in a polycarbonate greenhouse are perfectly protected from the wind. They get enough sunlight, but you can not skip watering time, otherwise the drought will lead to plant disease, their depletion and loss of crops.

Cucumbers in the garden are good in sunny weather, but very bad in heavy rains and strong winds. Plants start to get sick and disappear. To prevent this from happening, you need to mulch the ground with straw or stale sawdust.. Heavy rains wash away nutrients from the soil that cucumbers did not have time to assimilate. But you can’t overdo it with top dressing. Feeding schemes are the same for both soil and greenhouse cucumbers. However, if the ground cucumber is overfed, complaining about the heavy rains that washed out trace elements from the soil, then the plant will simply “burn out”. At a temperature of +12 ° C and below, foliar top dressing by spraying the leaves will be the most effective. In the greenhouse, the first top dressing is carried out when the second or third true leaf appears on the whip. In 10 liters of water (not lower than 20 ° C) dilute:

• 20 grams of potassium sulfide or 15 grams of potassium chloride;
• 25 grams of double superphosphate;
• 15 grams of ammonium nitrate.

The resulting fertilizer is enough to water 10-15 plants.

The first application of top dressing is carried out at the stage of two true sheets.

At least two weeks later, a second top dressing is carried out. Mass flowering appears on plants at this stage, the first ovaries are visible. During this period, the optimal organic top dressing from bird droppings, mullein or horse manure. Dilute 0.5 liters of organic matter in a bucket of water, add 1 tablespoon of Nitrophoska. Mix well. Ready fertilizer can be used already in this form, but, as practice has shown, the following additives to it significantly improve the result:

• 0.5 grams of boric acid;
• 50 grams of potassium sulfide or 1 cup of wood ash;
• 0.3 grams of manganese sulfate.

Watering plants is carried out at the rate of 3 liters ready solution per 1 m 2.

The second feeding is carried out in the period mass flowering and the formation of the first ovaries

The third feeding is carried out 20-25 days after the second, and now better choice do for the benefit of organic fertilizers(herbal infusion or chicken / cow dung), since the fruits actively grow on the lashes. If there are no signs of pests or fungal diseases, the fourth feeding is also carried out every 3 weeks with organic fertilizers.

For the third top dressing, it is better to choose an organic fertilizer.

For cucumbers planted in open ground, the same types of fertilizers are used as for greenhouse cucumbers. After two weeks after planting, give the first top dressing. At this time, any complex nitrogen-containing mineral fertilizers are suitable.

The second feeding is carried out with the appearance of the first flowers on the plant. At this stage of growth, it is desirable to feed cucumbers with phosphorus, potassium and nitrogen fertilizers with sulfur. Plants must be watered with a solution of Nitrophoska (one tablespoon is diluted in 10 liters of water).

Organic fertilizers: mullein, bird droppings, manure diluted in water, herbal infusion - all this will have a good effect on the growth of cucumbers in any growing season. A week after the second feeding, 0.5 liters of mullein is diluted in a bucket of water, adding one teaspoon of potassium sulfate.

Root top dressing is applied through watering

The third top dressing is carried out when a lot of fruits are tied on the plant. This is done in order to prolong the growth period of cucumber lashes and stimulate the appearance of new ovaries on them. Here it is enough to feed the cucumbers once a week with organic fertilizers. But if the plant has slowed down in development, then special growth stimulants should be used.

Video: good organic chicken manure fertilizer

How to feed cucumbers during flowering and fruiting

During the flowering period, cucumbers need mandatory top dressing. At this time, the plant consumes a large number of trace elements from the soil, and he needs help to "endure" abundant flowering and the beginning of fruit formation is what determines the volume and quality of the crop. For this, a complex of fertilizers for the second top dressing is suitable. Some gardeners use foliar feeding a week after fertilizing the ground, spraying the leaves. boric acid(1/4 tablespoon), which is diluted in 10 liters of water.

The fruiting phase is the most consumable in terms of the consumption of nutrients from the soil. To avoid disturbing the formation of a large crop and replenish the reserves of trace elements in the soil, with the appearance of the first fruit, cucumbers must be fed step by step with a solution of Nitrofoska (1 tablespoon per 10 liters of water), and a week later - with a solution of mullein with the addition of one tablespoon of potassium sulfate, alternating every other week him with natural stimulant growth - herbal infusion.

The fruiting phase is the most consumable in terms of the consumption of nutrients from the soil.

Organic fertilizers for better growth of cucumbers

Best on growing greenhouse and ground cucumbers affects alternation of organic and mineral fertilizers . About breeding bird droppings, horse manure and mullein was mentioned above. However, there is another type of very effective organic fertilizer and natural growth stimulator - herbal infusion (fermented grass). It is prepared very simply: 2/3 of any herb is poured into the barrel and filled to the top with water. The infusion should stand in the sun for several days. To speed up the fermentation process, rye bread and a jar of old jam are added. Then, 10 cm furrows are made near the plants and a nutrient mixture is poured into them instead of watering. The grass left in the barrel must be spread out under the bushes, since it contains a lot of nutrients for the cucumber. On this infusion, cucumbers "grow by leaps and bounds."

The grass remaining in the barrel must be spread out under the bushes

Why you should not feed cucumbers in late summer and autumn

Cucumbers are a heat-loving crop that is planted in a greenhouse or in open ground when the threat of frost passes - in late spring. All stages of top dressing in the spring-summer period are described above. Cucumbers planted in spring, in autumn, with a reduction in daylight hours and the onset of cool nights, growth greatly slows down. In addition, the plant has exhausted almost all resources for flowering and fruiting, and in late August - September it forms the last fruits, but much more slowly than in warm weather.

In this case, top dressing becomes ineffective. The best solution would be to collect the remaining fruits in order to prepare a greenhouse or ridge for the next harvest next year, sowing the land with green manure: Shrovetide radish, mustard, buckwheat and others. This step should not be neglected. Pledge good harvest- timely prepared soil from autumn, and for this it must “rest” and be saturated with microelements obtained from other green manure plants.

For yeast top dressing, fresh (pressed) and dry yeast are used.

The secret is simple: yeast is very rich in trace elements that have a positive effect on plant nutrition. Universal fertilizer recipe: dissolve 100 grams of yeast in a bucket of water, and let it brew for 1 day. With this composition, cucumbers need to be watered only under the root.

Feeding cucumbers with yeast contributes to an increase in the mass of fruits and the total number of ovaries, a decrease in the number of barren flowers and a decrease in fruit hollowness by several times. Instead of yeast or together with them, dried rye bread is used. It acts like a starter, but in order to start the fermentation process, yeast must be added.

An infusion of grass and black bread with yeast is often used as a top dressing for cucumbers.

Watering cucumbers with yeast fertilizer is carried out in two stages:

• The first time fertilizing with yeast is given after planting the seedlings in the ground or after the appearance of the first two true leaves, if the cucumbers were planted with seeds. First you need to apply nitrogen-containing fertilizers as with the mandatory first top dressing described above, and a few days later - yeast top dressing.
• The second time the plants are watered with yeast a few days after the second mandatory fertilizing with phosphorus fertilizers.

Subsequent feedings are carried out with each planned watering. Water is simply replaced with a yeast solution. For greater mineralization, fertilizers use a herbal base of weeds, which are kneaded and allowed to brew for a day with yeast.

For cucumbers, this recipe is most effective:

• 500 grams of bread crumb or 200 grams of crackers;
• 500 grams of green grass;
• 500 grams of pressed yeast.

Pour warm water into a bucket of 10 liters, add all the ingredients, knead them thoroughly and mix. Let it brew in a warm place for two days.

Video: yeast nutrition recipe

Cucumbers are a southern crop that needs not only a certain microclimate, but also timely top dressing to help harvest a good harvest. There are no differences between top dressing in the greenhouse and open ground. If cucumbers receive nutrients on time, then a crop of excellent quality can be harvested until the first frost.

Still, how many different problems the garden and the garden “throws” us. It's only good to buy vegetables in the market, when they lie in rows there, they are all so beautiful. If you grow them with your own hands, then you have to decide a lot various tasks in order to finally get this very, long-awaited harvest. And sometimes we don't get what we expect at all.

If the leaves of the cucumbers turn yellow, then more serious problems will surely begin, which can end very badly. To solve this problem, it turns out to be enough to process the cucumbers at a certain stage. When exactly to carry out such processing and with what, let's try to figure it out.

Cucumber leaves turn yellow and dry. What can be done in this case?

In addition to the fact that the leaves of cucumbers turn yellow, their ovaries may also turn yellow. As for the ovary, there is also an article about solving this problem, here it is, read it. In addition, empty flowers can develop on cucumbers or when improper care they can be bitter, which significantly worsens their taste qualities. It is clear that this is not even all. But we encounter such problems only with cucumbers. In addition to them, we grow many more crops. So, as you can see, a good gardener is unlikely to remain without work at the height of the season. Yes, and in the off-season, there is also enough work in the garden, although, of course, there is still so much.

Now let's move on to the solution of our today's problem. So that the leaves on your cucumbers do not turn yellow, you need to take care of them accordingly. What is this care? You need to start from the earliest stages of growing cucumbers, that is, from the phase of the appearance of 3 or 4 leaves on them. When this happens, they will need to be processed with a fairly simple composition. We take an ordinary bucket for this purpose, pour water into it, then pour iodine into it (30 drops), in addition to it, you will need to put laundry soap(gram 20) and another liter of milk. All this is simply mixed and this solution can be used for its intended purpose. Spraying once will not be enough. It is best to do this procedure after about ten days.

In addition to this composition, there are others that will also help you solve the problem of yellowing leaves on cucumbers. You can try the bread option. We buy bread (will use it whole) and soak it all in the same bucket of water. We leave it there all night. Already in the morning, it will need to be kneaded well and add the same iodine, but already a whole vial (small). The solution is ready, but it will need to be further diluted. A liter of such a bread-iodine remedy is diluted with a whole bucket of water. The solution that you have left will not be lost. It will need to be poured into plastic bottles and stored in the basement. It is necessary to carry out such processing less often, once in 2 weeks it will be enough. If you do this, until autumn, neither the leaves nor the fruits themselves will turn yellow.

You can use whey. We will proceed again from the same bucket of water. Whey for this volume will need to take 2 liters, and besides it, sugar (150 grams).

The next option to prevent yellowing of the leaves is to use onion peel. She not only dyes eggs, but is also very widely used in various fields. We will measure the husk with a jar, we need 0.7 liters of it. We also put it in a bucket of water and boil it. When it boils, immediately remove it, cover the whole thing with a lid and let it stand for 12 or 14 hours. Next, just filter it, wring it out and let this solution stand still. We dilute 2 liters of such a solution again with water (8 liters) and spray the leaves on the cucumbers with it. At the same time, it is best to do this not only from above, but also from below. In addition to the leaves themselves, it will also be necessary to spray the soil under the cucumbers.

When the leaves dry, it is likely that the reason may be the simplest - they simply do not have enough water. So you will need to adjust their watering.

There is another option based on the use of the same whey. Here we already pour it only a liter into 5 liters of water and also process cucumbers.

Here is another useful video on the same topic, where they will tell you which drug can solve the problem of yellowing leaves on cucumbers and not only on them. We look.

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But there are also many other reasons that can affect the fact that the leaves begin to turn yellow, here is the following list, where you can find a lot useful information so that the cucumbers turn out just healthy and tasty:

What to do in this case - all gardeners will ask this question. Well, of course, the soil must be fertilized, "feed". But even with fertilizer you should not overdo it, you need to know when to stop. It happens that cucumbers lack moisture, water, in this case it is necessary to water the plant abundantly with settled water warmed under the rays of the sun: poorly lit and not blown. In this case, it is necessary either to reschedule plantings, if possible, or to provide plants with additional lighting and supply of fresh air.​ ​1.​

Proper agricultural technology

Landings have long outgrown capacity

If the disease manifested itself at the initial stage of fruiting, you can forget about the harvest. The disease spreads rapidly, leading to the death of the fetus.

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

Melon aphid:

Fusarium

Dark green veins yellow spots- lack of iron.

• A new gardening season begins, and the question arises of how to avoid last year's problems and provide your family with a good and high-quality harvest. Many gardeners are concerned about the yellowing of cucumbers: seedlings, leaves, lashes, embryos, greens turn yellow.
• Maybe cucumbers just lack moisture? After all, all cucumbers love water.
• Cucumbers are not long-lived plants, but, nevertheless, I would not want to observe yellowed leaves on young plants.
• Read moreWhy garlic turns yellow in the garden
• Return frosts

. In this case, the roots of cucumbers have nowhere to develop, the plant lacks nutrition. The only way out of this situation would be an urgent transplant of plants in open ground or in a greenhouse.​

​Experienced gardeners be sure to carry out preventive spraying before the fruiting period of cucumbers garden culture by special means: twice a week. In addition, for growing in a greenhouse, it is better to choose varieties of cucumbers that are resistant to this disease.

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 to avoid further spread to healthy roots.

It settles on the underside of the leaves, feeds on plant sap both in the seedling phase and in adulthood throughout the season, as a result of which the leaves turn yellow.

Occurs with sudden changes in temperature when ovaries appear or due to damage to the roots and stems during loosening. Toxins released by the fungus delay the supply of food, the leaves turn yellow, and the plant wilts. It is necessary to replace the infected soil and choose other varieties of cucumbers.

The death of the lower leaves and yellowing of their tips is a lack of zinc.

Why do cucumbers turn yellow? Among the possible reasons, there are several main ones.

Cucumbers need to be watered properly. They need to be filled with water so that water penetrates into the deep layers of the earth and the roots of cucumbers absorb moisture.

Leaves may turn yellow due to prolonged rainy weather or excessive flooding. This usually happens at the seedling stage.

Yellowing of leaves in greenhouse plants can be the result of the phenomena that we have already mentioned in the article. This includes return frosts, when plants need to provide extra cover, as well as the defeat of plantings by fungal diseases. But greenhouse plants also have reasons:

- this is one of the main causes of yellowing leaves cucumber plantings in open ground conditions. To prevent this from happening, it is necessary to plant seedlings in a timely manner. It is worth remembering that the culture develops safely at a temperature of + 22 + 26 degrees. If it gets colder outside, then cucumber plantings will need to provide additional shelter. This can be done using a film or special materials - spandbond, agrotex or lutrasil.​

Diseases of cucumbers

2. Very often yellowing of seedlings of cucumbers

Cucumber insects - pests

associated with pests

If we talk about insects that cause yellowing of leaves in cucumbers, then the most common of them are melon aphids and spider mites.

• One of the most dangerous enemies cucumber - greenhouse whitefly, able to 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. Spray with water as often as possible and do not forget to loosen the soil, apply fertilizer in the form of rotted sawdust, peat and humus. Planting cucumbers in the greenhouse begins in early May. The soil for this is prepared in the fall, treating it with a solution of potassium permanganate and water (3 g per bucket). But very often, when growing, gardeners find that the ovaries and leaves of cucumbers begin to turn yellow.
• - the most common disease of cucumbers in greenhouses and greenhouses with high humidity. Small light spots appear on the leaves, then covering the entire surface, with a red or whitish coating. Then the leaves turn yellow, dry, the ovaries shrink and die. Infection of cucumbers - from July to September, especially in rainy weather. If you do not take action, the fungus may appear next year. The problem of yellowing and subsequent fall of flowers and ovaries of cucumbers due to insufficient soil fertility can be solved during the growing season by regular fertilizing with mineral and organic fertilizers. Great importance It also contains essential trace elements in the soil. Improper feeding can also cause yellowing of cucumbers.

love warm and humid environments

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Make sure that water droplets do not fall on the leaves, otherwise there may be a leaf burn.

In order to avoid such a problem, it is recommended to plant cucumbers on a bed well seasoned with manure. Also, once a month, you can feed cucumbers with purchased mineral fertilizers. Once a week, you need to pour a weak solution with fertilizer under the bushes.

With a lack of minerals in the soil

diseases typical for this culture

. If any are found on seedlings, it is urgent to take action and treat the seedlings with appropriate preparations.

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.

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

Bacteriosis

Watering

. For their proper development and fruiting, temperatures from +22 to +25ºС are needed. At temperatures below +14ºС and above +42ºС, plants stop developing, turn yellow and wither. Therefore, in our conditions, with short-term frosts and cold snaps in late spring - early summer, it is recommended to use greenhouses and frame greenhouses.

Causes of discoloration in cucumber leaves may be different. Most often, the problem is associated with a lack (or, conversely, an overabundance) of nutrients, microelements. Here it will be important to pay attention to the nature of yellowing - the measures taken will depend on this.

In general, all plants that have green color, due to the fact that they have Chlorophyll.

in most cases, nitrogen. Here a complex of mineral fertilizers will come to the rescue. It will not be superfluous to add rotted manure to the soil before planting.

. For example, powdery mildew, in which a gray-yellow coating appears on the leaves. Also dangerous for cucumber plantings is the viral "green mosaic", which manifests itself in the alternation of dark green and light yellow spots on the leaf. Often plants are affected by root rot. The cause of the disease can be a sharp difference in day and night temperatures, as well as watering with cold water. You can fight diseases with the help of drugs such as Beileton, Ridomil Gold MC, Quadris 250 sc.

3. A fairly common phenomenon is the yellowing of the cotyledon leaves of cucumber seedlings. In most cases this

A common greenhouse pest of cucumbers is the whitefly. She sucks the juice from the plants, causing them to turn yellow and dry.

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Why do cucumber leaves turn yellow in a greenhouse?

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.

powdery mildew

Lack of nutrition

Occurs with sudden temperature changes, lack of trace elements, improper fruit formation and high humidity. Between the veins on the leaves appear brown or dark green angular spots, oily, with drops of mucus. First, the flower petals rot, then the ovary. Bacteria can cause rotting of fruits, as well as seedlings and cotyledons.

Fusarium wilt

A change in color and yellowing of the leaves of cucumbers is possible with insufficient or improper watering. Cucumbers are watered with separated warm water, regularly, deep enough for water to reach both surface and deep roots without flooding the plants, after 1 or 2 days, 1-2 buckets per square meter.

​Selecting a place​

root rot

​Remaining information can be found here. There is also a good article here.

If in a Plant, for example, in a cucumber, the edges of the leaves begin to turn yellow, this tells us that there is no Chlorophyll in these parts.

Peronosporosis

2. The main reason for the yellowing of the leaves of cucumber plantings in greenhouse conditions is

3. Naturally, for planting in open ground, it is necessary to ensure a balanced

due to lack of light

After processing the plant chemical preparation all fruits from cucumbers must be collected and discarded. It is not safe to eat them.

Pests

The culprits for why cucumber leaves turn yellow in a greenhouse may be various diseases and pests.

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 the leaves of cucumbers first lighten, then yellowing appears. This deficiency also affects the fruits themselves - they begin to curl.

Downy mildew

Excessive moisture in cold weather and watering with cold water can lead to root rot, plants become sick and turn yellow. When watering cucumbers in sunny weather, try not to let water get on the leaves so as not to burn the leaves, which will cause them to turn yellow.

Many ovaries on the plant

Cucumbers can turn yellow even if the beds are placed incorrectly. This culture does not like excessive lighting and high temperatures, which is why it is better to arrange cucumber beds so that at lunchtime the beds are in the shade. Observing the rules of crop rotation, the place for the beds must be changed every season, and the soil in the greenhouse should be regularly replaced.

There may be several main reasons at once: this is a lack of moisture in the soil, infertile soil, improper location of the beds ( perfect option- when a shadow falls on cucumbers in the middle of the day), then sunburn can be avoided.

Poor pollination

And why exactly yellow?

non-compliance with the basic rules for growing plants

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Why the leaves of cucumbers turn yellow in the open field and in the greenhouse - Onwomen.ru

watering regime

Causes of yellowing leaves in seedlings. How to fight?

. This is easy to fix by choosing more appropriate place without direct sunlight.​

Another culprit for yellowing leaves on cucumbers is the too frequent ovary of cucumbers. Experienced summer residents they know that it is undesirable to leave more than 25 ovaries on one plant. This disease appears in cucumbers when infected with a spore-bearing fungus. Light large spots form on the leaves, which rapidly increase and spread to all seedlings in the greenhouse. If this disease is not treated, then it will manifest itself in the next season. Lack of heat

, or peronosporosis, appears in greenhouses or under dense cover after heavy rains. From above, oily spots of light yellow color appear on the leaves, passing to the underside of the leaf; then a gray-violet coating appears in place of the spots. The spots increase, merge, the leaves turn yellow and dry. Bacteriosis can lead to the complete destruction of the crop. Lack of pollination Optimum soil mineral content

Measures to help you avoid yellowing of the edges of the leaves of cucumbers: Because cucumbers lack potassium.. Most often this is due to a violation of the irrigation regime. The rule says: it is necessary to water the greenhouse plantings of cucumbers with exclusively warm settled water. Some gardeners, in order to save time, water the plantings with a hose. Under no circumstances should this be done. On hot days of planting, it is better to water in the early morning, and in cool weather - in the afternoon. During the formation of ovaries, watering becomes more frequent.

. In addition to the above measures to combat yellowing leaves, for plants in the open field, it is necessary to provide favorable conditions for development and fruiting. 4. It is possible that the seedlings are simply Today, some varieties of cucumbers are known that, when grown in a greenhouse, are capable of producing a hundred or more ovaries. In this case, timely plucking will help to avoid yellowing of the leaves, otherwise the young ovary will delay the formation and ripening of the fruit.

​To minimize the chance of powdery mildew infestation, choose varieties of fungus-resistant cucumbers to plant. Low night temperatures are one of the primary reasons cucumbers turn yellow in a greenhouse. Cucumbers are heat-loving plants that react very sharply to temperature changes. This happens especially often in middle lane 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. Root rot

Yellowing of leaves in cucumber plantings in the open field

Plants may turn yellow when artificially pollinated cucumbers are sown and there is no access to them (in a greenhouse or closed greenhouse) for pollinating insects. Yellowing of plants can be caused by a lack or excess of minerals in the soil. Basic construction material nitrogen for cucumber. With its lack, the leaves of cucumbers brighten, turn yellow over the entire surface along the veins, then the lashes, embryos, leaves fall off. The edges of the leaves of cucumbers can turn yellow for several reasons. And this:​

If you water your cucumbers well, then everything will be fine. 3. In some cases, the yellowing of leaves in cucumber seedlings is affected by 4. Also negatively affect the color cucumber leaves maybe

Not enough nutrition It is possible that the reason why cucumber leaves turn yellow in the greenhouse is poor pollination. It is possible that you have purchased artificially pollinated varieties of garden crops. fungal disease, causing yellowing of leaves on cucumbers - fusarium. Fusarium fungus leads to the death of the roots of the plant, causing the leaves to turn yellow.

Lack of water and low humidity occurs when sown in cold soil, with sudden changes in daily temperature, improper watering using unsettled cold water, after weeding, hilling and with burns. At first, individual fruits and leaves fade, then everything turns yellow, and the plant dies. Extra ovaries

With an excess of nitrogen, leaf pigmentation is observed. Small watering (if you notice this, then first of all you need to increase it) I think I managed to help you with the answer.

the appearance of pests

Causes of yellowing of leaves in cucumber plantings in a greenhouse. How to fight?

lack of essential minerals in the soil

. The lack of nitrogen, calcium, sulfur, manganese can affect the color of the leaves. In this case, it is necessary to immediately fertilize the seedlings. Sometimes the unnatural color of the leaves is associated with an excess of minerals in the soil. Then the plants must either be transplanted into other pots, or (if the time has come) into a greenhouse or open ground. It is better to prevent the yellowness of leaves on cucumbers than to look for its cause and methods of elimination afterward. Observe the conditions for growing garden crops, provide cucumbers with everything necessary for full growth, monitor the condition of the soil in the greenhouse and prevent the development of pathogenic fungal flora. Then you will definitely reap a rich crop of cucumbers! If you notice that the cucumbers in the greenhouse have turned yellow and dried out, the affected plants are easily pulled out of the ground, you need to change the infected soil. And next season, plant other varieties of cucumbers.

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, two waterings per week are needed. For one plant, 25 liters will be enough. warm water, and it will delight you with tasty and juicy fruits. Cucumbers can be damaged by pests that feed on leaves, stems and fruits, which leads to yellowing, drying and death of plants. You can fight them using properly selected drugs. No more than 25 ovaries should be left on each plant, since one plant is not able to feed more fruits, they begin to dry out, turn yellow and fall off.

A change in color and the appearance of spots on the leaves without wilting them can be indicators of a lack of certain elements: Long-term exposure of the leaves to the sun (it has already been proven by experience that the sun "burns" the leaves, they turn yellow and dry) I wish you a lot of cucumbers and health )​

. For example, melon aphids can accumulate on the underside of the leaves, as a result of which they begin to turn yellow. Proper identification of the problem and timely action (the use of specialized chemicals) will help to forget about pests forever.​

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Why do cucumber leaves turn yellow?

VK

Nadias

(nitrogen, potassium, phosphorus). It is very easy to fight this phenomenon by applying mineral complex fertilizers to the soil.​

5. In most cases, yellowing of plantings is associated

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Who doesn't love eating fresh and juicy cucumbers from their garden? Probably, there are few people who would deny themselves this pleasure. But before the ripe cucumbers decorate dinner table, vegetables need to be grown. And in this case, the gardener may experience some difficulties. If we are talking about cucumber culture, then sometimes one of the problems of gardeners is the yellowing of planting leaves. Moreover, the gardener may encounter such difficulty at any stage of growing cucumbers, from seedlings to planting in a greenhouse or open ground. Let's find out the main reasons why cucumber leaves take on an unnatural shade, and also decide how to deal with this phenomenon.

With this disease, yellowing of the leaves begins from below. First of all, weakened plants suffer.

Excess ovaries

Main pests:

Lilka-g

Timely harvesting of fruits

Yellow edges on old lower leaves are an indicator of magnesium deficiency, on young ones - copper deficiency.

Potassium deficiency / pests / infertile soil

You are most likely not watering them properly. If cucumbers are often watered, but with a small amount of water, then water and nutrients will not reach the root system of cucumbers and the leaves will immediately let you know about it. It is possible to overflow the plants with water, and in this case the leaves will turn yellow, because then, from excessive moisture, the roots begin to rot. Do not water at peak solar activity, water in the morning or evening. Fertilize in the correct dosage so as not to burn the plants with urea. Well, do not allow the formation of any fungi in the soil.

Proper care of cucumber plantings, as well as timely identification of problems and their solution, will save the leaves of cucumber plantings from yellowing.

5. Sometimes the yellowing of the leaves on the cucumber crop is due to the fact that for planting it was

with excess moisture in the soil

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Cucumber seedlings are very tender plantings. They demand special attention, otherwise the gardener may simply not wait for the harvest.