Seedlings of cucumbers dry dicotyledonous leaves what to do. Why do the leaves of cucumber seedlings turn yellow

Growing seedlings at home is quite an exciting activity, but it is associated with many difficulties and issues that not only beginners face, but also experienced gardeners. The problem in which the leaves of cucumber seedlings turn yellow is quite common, almost all gardeners sooner or later encounter a similar phenomenon and wonder why this happens.

Some may complain that young leaves turn completely yellow and begin to fall off, others that the ends begin to dry, and the leaf plates turn white and curl. Moreover, in the video and photo you can see how entire plantations change their pigmentation in a matter of days.

Why do cucumber seedlings turn yellow? Whatever the signs of plant damage, you need to determine the cause of this condition as soon as possible and try to save the seedlings. Most often, this kind of problem occurs after the appearance of the second true leaf. As soon as a new leaf grows, the lower one suddenly begins to change pigmentation and twist.

Because of what the leaves of cucumber seedlings turn yellow, it is not so easy to determine, since there are a lot of reasons for this phenomenon. The most common are:

1. Imbalance of micronutrients in the soil. Cucumber seedlings need potassium, manganese, sulfur, calcium, and nitrogen for healthy growth. A lack of these substances leads to wilting and poor growth of plants, and an excess affects pigmentation and can damage the root system.
2. Excessive waterlogging can provoke yellowing of the leaves in the same way as insufficient watering.
3. If you notice yellow edges or dry spots on the cotyledon leaves, you should pay attention to the location of the pots, the seedlings may not have enough sunlight.
4. Growing seedlings in cassettes that are too tight can also lead to lamina problems, as there is not enough room for the roots to fully grow.
5. Short temperature regime. Optimum temperature soil for seedlings of cucumbers - 20-25 degrees, but if the thermometer drops below 17 ° C, then the nutrients from the soil cease to in full act on the plant.
6. Late transplant. If for some reason you are not in a hurry to plant seedlings in open ground, it may simply outgrow. This affects not only the quality of the seedling material, but also the crop as a whole.

Diseases and pests that lead to yellowing and drying of the leaves

Also, cucumber seedlings are often affected powdery mildew, fusarium and root rot. Fusarium and powdery mildew are fungal diseases that lead to stunting and drying of sprouts, and often to their death. If you notice that the leaf plate turned white, began to curl and dry out, it is worth assuming the presence of one of these diseases. The cause of root rot is sudden changes in soil temperature, as well as watering too much. cold water. The roots of the plant begin to rot, causing the leaf plate to turn yellow and soft.

What to do if the leaves of cucumber seedlings turn yellow and dry?

The best way to prevent any problems with cucumber seedlings is proper fit and compliance with growing conditions. Measures to deal with already existing problems depend entirely on the cause that influenced their occurrence. If the leaves of the seedlings turn yellow from improper care, then all efforts should be directed to creating favorable conditions. First of all, you should pay attention to the temperature in the room to prevent freezing of the roots. Because cucumbers are thermophilic culture, the temperature in the room where the seedlings are grown should not be below 25-28 degrees. Cassettes with seedlings should be placed on bright windowsills, and on cloudy days they can be illuminated with special lamps.

Watering young sprouts is necessary only with warm settled water. It should be remembered that cucumber seedlings do not tolerate drafts, so be careful when airing. If the reason for the yellowing of the leaves is improper feeding, the soil should be fertilized with the missing trace elements. Especially fragile seedlings are sensitive to a lack of nitrogen and potassium. If the seedlings suddenly turn yellow leaves after feeding, it can be assumed that you have applied too much fertilizer to the soil, and the seedlings have received toxic poisoning. In this case, you need to rinse the roots of the plants with warm water as soon as possible. running water and completely change the soil.

If you notice that the roots of the seedlings firmly rest against the walls of the pot, and the leaves turn yellow and dry, then the problem lies in the lack of free space for the full development of the roots. Despite the fact that the plant does not tolerate picking well, it should be transplanted into a larger pot so that it does not die. It is also not recommended to sow seedlings too early, otherwise the plants will overgrow, begin to wither, and weather conditions may not allow planting them in open ground.

Many gardeners to get early harvest use the seedling method of growing cucumbers. Reverent care for seedlings does not always give the desired result. One of the most common problems is that the leaves begin to turn yellow. Seedlings are also susceptible to this. Why this happens and what to do - about this article.

Why can yellow or white spots appear, diseases develop, fruits fall off, stems dry up? Yellow leaves can appear for a number of reasons. You should not immediately get rid of damaged shoots, first you need to figure it out. The general picture of the state of the soil, the root system will tell you the criticality of the situation and help determine how to sprinkle cucumbers and what other activities should be started immediately. Among the main causes of yellowing leaves, gardeners distinguish the following:

• lack of light, it does not allow the plant to develop;
• deficiency or excess nutrients in soil (especially nitrogen and manganese);
• violation of the irrigation regime (overmoistening or drying out of the soil);
• growth of the seedling (there is little room for the roots in the container used for germination);
• unstable temperature conditions;
• the influence of toxic substances (observed when using foam and other polymers for growing seedlings);
• plant disease disease or pests.

From what the seedlings begin to turn yellow and dry, how to save it

If the cotyledon leaves turn yellow on the seedling material, begin to dry out, then the reason lies in the new shoots with which the seedling grows. To remedy the situation, it is enough to remove extra branches or ovaries. Violations in agricultural technology are also not excluded. Experts recommend making a schedule before starting seasonal work necessary activities, sow, plant and transplant, spray and fertilize in time.
The greens of the seedlings can turn yellow from low temperatures (especially with night frosts on the ground). That is why when planting seeds on open garden you need to cover it at night with a film or agrotextile.
Seedlings are sensitive to the lack of useful trace elements, in particular potassium, and this must be fought. It is important to adhere to the timing of top dressing so that the developing plant has enough strength and energy for normal growth.

When yellowness appears on seedlings only in a certain area of ​​\u200b\u200bthe beds, it is rather associated with an incorrectly chosen place. The problem is most likely in the composition of the soil or in the lack of light. When growing seedlings on a windowsill, it is important to prevent the soil from drying out and direct sunlight, they can burn, light shading is required.

Yellow leaves on seedlings in a greenhouse, what to deal with

When growing cucumbers in a greenhouse, the moisture and temperature regime is often violated. Excessive humidity of air and soil leads to the development of fungal diseases. The plant reacts to the deviation in external environment yellowed leaves. At first, the tips turn yellow, then the entire leaf may become covered. This signal should not be ignored.

Normal conditions for the development of seedlings provide for a temperature in the range of 22-26 degrees. If the indicator falls below 14 ° or exceeds + 42 °, cucumber shoots stop developing, and only one degree of frost leads to death. Yellowing leaves and embryos may signal a violation of the temperature regime.

Other possible reasons include:

• insufficient pollination, as a result of which ovaries are poorly formed on the plant;
• congestion of the shoot with ovaries;
• damage by a fungus or insects;
• lack of nitrogen and other microelements in the soil.

Yellowness on outdoor plants, diseases

When growing cucumbers in open ground, the yellowness of the leaves often indicates a violation of irrigation: a lack or excess of moisture. In extreme heat, it is recommended to water the bushes daily (morning or evening). If the summer temperature is moderate, then it is enough to irrigate the beds 2-3 times a week. But before each procedure, it is worth assessing the condition of the soil in order to prevent stagnation of water. You should also loosen the soil in a timely manner.

If we are talking about plant damage by diseases, then yellowness or white dots on greenery indicates fungal infections: fusarium, pitiosis, etc. The leaf does not respond to watering, it remains sluggish. It is necessary to treat: it is necessary to treat with special preparations, you cannot do without it. The main thing is not to lose time so that the affected area does not spread to neighboring bushes. And don't rely on folk methods, it is better to act according to science.

One of the rules for caring for cucumbers is that damaged areas should be removed to localize the problem. In the case of yellowing of the leaf, there is no need to rush, treatment is necessary here. First you need to check the temperature environment, soil conditions. This will help identify violations and correct them.

Do top dressing - improve the soil in the greenhouse

Feeding in the form of a ready-made solution

In addition to moisture and friability, the soil must be nutritious.. Growing seedlings take out most of the trace elements necessary for development from the soil. Therefore, in agricultural technology, there is a schedule for the introduction of top dressing, which enriches the environment. useful substances, contributes to strengthening immune system plants. There are two ways to introduce a useful substance. One is to spray ready solution, the second - sprinkle dry factory-made granules according to the instructions and pour plenty of water.

If the leaves turn yellow and dry around the edges, then most likely there is a lack of potassium and magnesium. And if green veins are preserved on a yellow leaf, we can talk about a deficiency of manganese and iron. In case of yellowing of the upper part of the bush, a lack of copper is diagnosed.

Granular fertilizer potassium nitrate

To fix the situation it is necessary to carry out complex feeding in a timely manner. Alternate organic with mineral, as well as root with foliar. Scheme of the introduction of nutrients:

• for the first time, cucumbers should be fed when one leaf appears on the seedlings (ammophoska; azofoska; manure; bird droppings; herbal infusions);
• the second time falls at the beginning of the flowering period (solution from water and wood ash 10 l / 1 glass; potassium and ammonium nitrate 20 and 30 gr., superphosphate 40 gr. on a bucket of water);
• the third top dressing is carried out during the active fruiting period (nitrophoska solution 10 l of water per tablespoon of the product; a solution of 10 l of water, 0.5 l of mullein and 1 tsp of potassium sulfate);
• the fourth dressing is used for varieties with a long fruiting period (a solution of wood ash, manure or bird droppings).

Proper watering prevents the soil from drying out

You need to correct the error in irrigation, taking into account the following factors:

• type of soil;
• age of cucumbers;
• features of agricultural technology varieties;
• weather conditions.

Important!
When choosing an irrigation system, give preference to sprinkling and drip irrigation. Dosed moisture will also prevent damage to the crop by powdery mildew, root and olive rot.

Organizing automated hydroponics for a beginner gardener will not be possible.
In open ground, it is necessary to moisten the bed more often than when growing greens in a greenhouse. Beginners should as a basis use watering rates based on one bush:

• with a shoot age of up to 1 month, 0.5-1 l of water will be required;
• from 1 to 2 months, the water rate increases to 1.5 liters;
• from 2 to 3 months - up to 2-2.5 liters;
• over 3 months - up to 3-3.5 liters.

Light and temperature, do not let the plant turn yellow

A characteristic sign of a lack of light is the yellowing of the lower leaves on the bushes. It is impossible to change the landing site of developed bushes, so weeding should be carried out in a timely manner so that weeds do not form a shadow. Also, during the formation of the whip, care must be taken to ensure that neighboring plants do not spread on top of each other. This will not happen if the recommended scheme is taken into account when disembarking. Keeping intervals will help prevent overcrowding.
Changes in temperature also affect the color of the cucumber leaf. It is impossible to influence nature, but it will be possible to save the plant from low temperatures by building a frame and covering it with a film. If the climate is dry, then planting cucumbers should be done between corn or sunflowers. Neighboring crops will scatter sunlight, preventing greenery from burning.

Errors when landing in open ground

It is often difficult to correct errors when yellowness is detected on sheets, because the reasons may lie in improper planting of seedlings or seeds. Therefore, it is important to observe the basic requirements at the beginning of the formation of beds:

• every season change the place for cucumbers (you can return to the previous one after 3-4 years);
• observe the distance between the holes, do not save on row spacing;
• do not use more fertilizer than indicated on the package, excess nitrogen, for example, burns out a young plant;
• before planting seedlings, it is hardened for at least a week;
• when choosing neighbors, the coexistence of cultures is taken into account.

Pest control, treatments

If the bed is still attacked by pests, it is treated with insecticides and acaricides. Among the popular drugs are the following:

Prevention of yellowing, spray with nutrient mixture

• annually change the place under the cucumber bed;
• shoots with 2-3 leaves should be sprayed with a nutrient mixture of water (10 l), milk (1 l), iodine (30 drops) and laundry soap(20 g);
• for irrigation, use the nutrient liquid obtained after infusion of bread with water;
• powdering the soil surface with wood ash will not only neutralize acidic soil, but will also become a protection against pests.

You may not encounter the problem of yellowing at all if you follow all the rules of care and prevention in a timely manner. This is much easier than wasting strength and nerves to restore the affected plant.

When growing cucumber seedlings in seedling boxes or peat cups, gardeners face a lot of problems, and one of them is leaf drying. After the latter, the cucumber bushes themselves gradually begin to dry out, if nothing is done!

Cucumber seedlings themselves are very capricious and it is difficult to grow them at home. It is knowing this that most summer residents try to immediately sow seeds in open ground. Drying of seedling leaves can occur for several reasons, and if they are not immediately eliminated, which happens with inattention and inexperience, then it will not be possible to save the bushes!

Why do the leaves of cucumber seedlings dry and what to do?

There are several reasons for this:

1. Leaf drying on young plants most often occurs on initially low-quality plantings, namely, perhaps you used a bad one. planting material or incorrectly prepared the substrate for planting. No matter how hard you try to help such plants, it still won’t work, so if there is still time, plant new seedlings of cucumbers! Seeds before planting will need to be immediately checked for germination and this time you need to buy them from “verified” sources! Prepare the substrate according to the following recommendations. Take a liter jar of peat and humus, add half a liter of sawdust and a couple of pinches of wood ash to them, mix and use. Additionally, you can add a handful of soil from your garden plot.
2. A similar reason can be triggered by a lack of nutrition. Perhaps you not only made a poor-quality substrate, but also not enough space was allocated for each spine in landing capacity. In this case, you can try not to water the cucumber seedlings at all for a couple of days, and achieve a strong drying of the soil, but the plants should not wither! After that, carefully remove the bushes along with the soil, which will tightly envelop their roots, and transplant into a larger container, the substrate of which is rich in nutrients. If you are afraid to disturb the plants, since the seedlings are already weak, and most of the leaves have already dried up, then try to revive it with compounds prepared on the basis of mineral fertilizers- such as superphosphate, potassium sulfur, nitrophoska and other substances that in this case can be offered to you in a gardening store.
3. The leaves of cucumber seedlings begin to dry out even after improper watering. Everyone knows that cucumbers are very fond of high humidity, however, they do not take into account that this applies to plants planted in open ground, where they will grow. Indoor seedlings does not always need another watering soon, because the room does not have such ventilation and solar heating as in an open area. In this case, it is necessary to reduce the frequency of watering and strictly monitor the condition of the soil.
4. Leaves will dry even in case of extreme heat. This happens if the seedlings are close to the battery.
5. Flaw sunlight and coolness, drafts will also lead to the drying of the plant.

As you can see, the causes of this problem are all earthly and easy to eliminate, the main attention should be paid to them early!

Cucumber is a rather capricious culture, but not a single one gardener refuse to grow it. Pickles, marinades, salads, and preservation cannot do without cucumbers. Today's assortment of this vegetable is amazing.

And, nevertheless, every year the market is replenished with new, more productive varieties. Planting plants in greenhouses or soil, we hope to get excellent harvest, but very often we are disappointed when we see how cucumber leaves turn yellow.Therefore, before starting to engage in this culture, you need to know in advance why?

The leaves of cucumber seedlings turn yellow what to do.

Vegetable growers have been growing cucumber seedlings at home for a long time and often encounter a change in plant pigmentation in the second leaf phase. The reason for this is not the soil used for seedlings, but an acute shortage of micro and macro elements. If the lower leaves turn yellow, cucumber seedlings need to be fed with phosphorus, magnesium, potassium. Yellowed upper leaves indicate a lack of iron, boron, manganese, zinc. Yellowness may appear due to a change in the ratio of trace elements in the soil, for example, potassium and ammonium salts.

Cucumbers overfed with nitrogen fertilizers get ammonia poisoning. "Elongated" seedlings indicate a lack of potassium. To organize the correct top dressing plants are best to use ready-made fertilizers balanced in microelement composition. An equally important problem is correct formation cucumber root system, which is possible only in spacious pots. Do not miss the moment of picking, otherwise the seedlings you grow will be weakened.

If necessary, rearrange the cucumbers in a place illuminated by the sun or use artificial lighting.Most common mistake- improper watering. Do not keep cucumbers in dry or wet soil.

This is harmful to the root system! Cucumber culture is sensitive to temperature changes. Often yellowed and dry leaves are a response to cold nights. You will be surprised that the reason, why do cucumber leaves turn yellow, are foam plates on which seedlings are placed. Chemical compounds, penetrating into the soil, cause poisoning of plants, therefore, using polystyrene, it is better to wrap it with plastic wrap. Knowing everything possible reasons color changes, you will be able to decide on your own when cucumber leaves turn yellow what to do.

Why do cucumber leaves turn yellow?

Yellowing of the leaves can be observed not only in seedlings. It is possible that fruit-bearing plants fell under return frosts.

Often the reason lies in the lack of watering plants or damage to the root system by pests. Frequent watering of plants in small portions does not allow water to penetrate deep into the soil. Occasional heavy watering is also useless.

Moisture stays in upper layers soil or quickly seeps into the depths without lingering in the soil. This leads to drying of the roots and yellowing of the leaves. It is enough if you start watering the cucumbers twice a week with warm water.

Avoid getting water droplets on plants as they can cause sunburn leaves and changes in their pigmentation. Cucumber suffers from high temperatures, especially in greenhouses. The plant quickly ages and withers.

To avoid this, it is necessary to organize regular ventilation for fresh air. Quite often, cucumbers are affected powdery mildew . The lashes of plants are covered with a yellowish coating and stop growing.

As a result, cucumber leaves curl and turn yellow. Such plants are treated with Bordeaux mixture, Kuproksat, Acrobat and Bravo. Pledge high yield – correct crop rotation. It will be rational to grow cucumbers in one garden every four years.

In greenhouses, one cannot do without a complete replacement of the soil or its disinfection with Em-1, Baikal, humus tincture. Modern biological protection of cucumbers involves the use of biofungicides that inhibit the growth of pathogenic mushrooms . It is important, when working in the beds, to protect cucumbers from mechanical damage.

All kinds of injuries increase the possibility of infection or the spread of fungal diseases. When examining cucumber leaves, you should pay attention to the appearance of melon aphids or spider mites. When growing plants in a greenhouse, be prepared to fight back against the whitefly. Remember, Why do cucumber leaves turn yellow? with a deficiency of nitrogen, calcium, magnesium, copper, iron and zinc in the soil. It is better to prevent their yellowing and immediately provide the plants with the necessary nutrients.

Growing seedlings of cucumbers

Each crop needs its own approach to growing, and cucumber is no exception. If you know some secrets of gardeners and put them into practice, you can get an excellent harvest.

To reject cucumber seeds unsuitable for cultivation, they must be lowered into a weak 3-5% solution of ordinary edible salt at the rate of 15 g per 0.5 l. After mixing, full-weight seeds will be at the bottom of the container, and empty ones will float to the surface of the water. A weak solution of manganese will help decontaminate.

Before planting seedlings, it is best to germinate the seeds. They need to be wrapped in gauze, the humidity of which is constantly maintained, and kept in a warm place with a temperature of up to 30 ° C. Usually, under such conditions, the seeds germinate in 4-5 days, their sprouts reach about 3 mm in length.

Terms of planting cucumbers for seedlings

Depending on the further nature of growing cucumbers, seeds for seedlings should be planted at the end of March (for glass and film greenhouses), as well as during April (for open ground). It must be remembered that cucumbers do not tolerate transplanting well, so you need to prepare many separate pots, making them, for example, from paper using a stapler.

Soil for seedlings of cucumbers and planting seeds Soil for seedlings of cucumbers can be bought at the store or prepared independently from turf, sawdust, peat and humus in equal proportions. Place one or two seeds in each container and grow at temperatures up to 28 ° C. You can cover the containers with polyethylene to reduce the rate of evaporation of moisture.

Seedlings of cucumbers stretched out what to do

In a situation where two sprouts appear in a pot, one that is weaker must be removed, but not uprooted, but pinched off the stem. After this, it is necessary to transfer the seedlings to a colder place so that the shoots do not stretch out. What to do if this still happened?

A simple method will help here: the sprout must be cut in half between 3 and 4 true leaves. The cut shoot is placed in a glass of water and takes root, then placed in the ground.

Why do cucumber seedlings turn yellow?

Some gardeners are faced with the problem of yellowing seedlings of cucumbers. This is due to the small volume of the container in which it grows. The solution to the problem in this case will be an early transplant into larger cups or boxes.

If it is strongly tightened with a transplant, the shoots may completely wither. Highly milestone growing seedlings is top dressing. The best option there will be a non-root method.

Dissolve urea in water and ammonium nitrate in the proportion of 5 g per 1 liter; You can use various complex fertilizers. Spray the leaves with the prepared composition. The procedure is recommended to be carried out in cloudy weather or in the evening.

Read more about growing cucumbers:

Cucumbers grown in the country are fragrant and healthy. They differ significantly in taste from vegetables bought in the supermarket. But growing healthy cucumbers is not so easy, the plant is prone to many diseases.

Often summer residents are faced with the problem that the leaves of cucumber seedlings turn yellow. The problem begins when the second true leaf appears. The second leaves grow, and the first begin to change pigmentation.

Moreover, the matter may not be at all in the substrate in which the seedlings are planted. So why do cucumbers get sick at an early stage of development?

Why do cucumber leaves turn yellow?

There can be several reasons for burning leaves, the main ones include:

1. Lack of potassium, nitrogen, sulfur, calcium, manganese in the soil. An imbalance of nitrogen and potassium, the correct ratio of elements is 1 to 2. An excess of nitrogen affects the pigmentation of the foliage and can lead to ammonia poisoning. Insufficient watering affects the yellowing of seedlings in the same way as severe waterlogging. Temperature changes. If the temperature in the root zone drops below 17 degrees, then the plant is not able to take micro and macro elements from the soil. At this temperature, even if all the useful elements are in the soil, they do not enter the stem. Toxin poisoning. Some farmers put seedlings on foam boards. Yellowing may be caused by poisoning chemical compounds, which are emitted by the insulating layer, since the roots of the plant are in contact with it. Fertilizer, falling on the foam, can lead to the release harmful substances, which is dangerous not only for seedlings, but also for the harvest. Seedlings can be crowded in peat cup, so many summer residents immediately sow seeds in the ground. Roots need space and good nutrition. Yellowing of the leaves may indicate that it is time to repot the plant. Lack of light.

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Cucumber leaves turn yellow: what to do?

• Balance the doses of fertilizers, do not exceed the ammonia content in the solution. With a lack of nitrogen, you need to fertilize the plant with Vermistim or Azogran. If a foam substrate is used, then lay it on top with a film. If the seedlings grow on the balcony, then you can use backlighting.
• Do not forget to monitor the microclimate. Cucumbers love water, so don't skimp on watering. However, remember that the plant needs to be watered only warm water, street temperature. If you water the plant with cold water, diseases cannot be avoided. At the seedling stage, the plant is especially sensitive to a lack of potassium, if you do not follow the development, cucumbers will grow irregular shape. The best nutrient solution for cucumber seedlings is based on complex fertilizers. For example, Kemira Hydro.

But the leaves of cucumbers turn yellow along the edges, not only in seedlings, but also in an adult plant. This may be due to the fact that the plant is fully ripe. If the temperature is high in summer, and cucumbers are poorly watered, then yellowing is a natural process.

Read also: Having listed the main reasons why cucumbers in a greenhouse turn yellow, we will consider each of these problems in more detail.

Violation of agrotechnical conditions

Low temperatures and frosts

Cucumber, as you know, the plant is warm and moisture-loving. In conditions middle lane, especially at the end of May, the so-called "return frosts".

Cucumber seedlings planted under film shelters or in greenhouses can not only turn yellow, but also stop growing and developing. To avoid that the leaves of cucumbers turn yellow in the greenhouse, it is necessary to additionally cover the planted plants with lutrasil or bubble wrap.

Many gardeners, sub-zero temperatures and frosts, put plastic bottles with hot water in order to maintain a normal temperature for the growth and development of cucumbers. Attention: It is important to remember that this plant prefers a temperature in the range of + 22 + 260С for its development. In the event that the temperature drops below +140C, or above +420C, the plant stops its growth and development.

If the temperature is below -10C, the cucumber seedlings will die. Thus, in order to protect the cucumbers planted in the greenhouse from frost and low temperatures, they should be additionally covered with a film placed on the arcs, or with a special non-woven covering material such as lutrasil, agrotex or spandbond. This will help keep the temperature in the greenhouse acceptable for plants.

Lack of mineral elements in the soil

Also, the reason why cucumber leaves turn yellow in a greenhouse can be deficiency minerals in the soil in which the plants were planted. As a rule, the leaves of cucumbers in the greenhouse turn yellow due to a lack of nitrogen.

Yellowing begins with the fact that the leaves have a lighter color, and then completely turn yellow, both the veins themselves and the entire leaf space between them. Subsequently, all the lashes of the plant turn yellow.

Another sign indicating a nitrogen deficiency in the soil is the irregular, “hook-shaped” shape of the fruit. Excessive application of wood ash, potash fertilizers or superphosphate can cause a lack of nitrogen in cucumbers.

In order to avoid nitrogen deficiency in cucumbers, it is recommended that cucumber seedlings be fertilized a few days before planting in greenhouses and sprayed with a solution of trace elements (see How to choose the right fertilizer for cucumbers in a greenhouse). When digging a greenhouse in autumn and spring, it is necessary to make rotted manure, at the rate of two or three buckets per 1m2. This will help to avoid nitrogen starvation in plants.

If, in the process of digging, manure was not introduced, then before planting the seedlings in the greenhouse, you can introduce rotted mullein into the soil, and during the entire growing season, feed the plants with an aqueous solution of mullein or chicken manure, as well as an infusion of herbs, which is also called " herbal tea". It will also help to eliminate the lack of nitrogen in the soil by applying mineral fertilizers containing nitrogen in their composition.

A unique way of growing seedlings of cucumbers from Oktyabrina Ganichkina and the magazine Lyubimaya Dacha

The leaves of cucumbers in a greenhouse and greenhouse turn yellow even when too much mineral fertilizer is applied to the soil. Before applying this or that fertilizer, carefully read the manufacturer's instructions on the package.

Insufficient watering

Cucumbers are moisture-loving plants and demand as frequent watering, and high humidity in the greenhouse or greenhouse where they are grown. However, watering these plants should be carried out only with warm and settled water.

The leaves of cucumbers turn yellow in the greenhouse and from watering with cold water, and from its insufficient amount. At a time when active fruiting occurs, watering should be increased.

It is necessary to moisten the soil quite deeply, since it is precisely deep penetration water will contribute to the development of not only the surface, but also the deeper root system of plants. Irregular and insufficient watering will affect both the leaves themselves and the ovaries and fruits of cucumbers.

Insufficient pollination

One of the reasons why cucumber ovaries turn yellow in a greenhouse may be poor pollination. flowering plants. This may be due to the fact that only artificially pollinated plants were planted, as well as due to the lack of ventilation or the possibility of access for insects to pollinate plants (see How to attract bees to grow a good crop).

In this case, you can use spraying dissolved in water boric acid(5 grams per 10 liters of water), or preparations "Bud" or "Ovary". Of the natural methods, you can use sweet water spraying (one tablespoon of sand or honey is dissolved in two liters of water), which will attract insects.

For the next season, in the greenhouse in which you plan to plant cucumbers, plant dill, or some honey plants, for example, borage, hyssop. These plants will be able to attract insects to the greenhouse, which can pollinate the plants and promote the formation of normal ovaries.

Plant overload with ovaries

In the literature on gardening and growing cucumbers in greenhouses, when asked why cucumbers turn yellow in a greenhouse, they answer that it is not advisable to leave more than 20-25 ovaries on one plant at the same time. This is due to the fact that cucumbers develop quite quickly in greenhouse conditions. Many hybrid varieties it is possible to form more than one hundred and fifty ovaries on one plant at a time.

It is necessary to pinch new shoots in a timely manner to enable cucumbers to form and ripen normally. In the event that excessive shoots and ovaries were not removed, then the fruits may develop an ugly shape, and cucumbers in the greenhouse also turn yellow.

Plant damage by insects or fungal infections

So, let's figure out what insects and diseases can harm cucumbers, and how to deal with them (see Diseases of Cucumbers in a Greenhouse, Causes and Treatment Methods).

fungal diseases

Fusarium wilt or Fusarium - a fungal disease

This disease manifests itself as follows: cucumbers sprout normally and grow well, but as soon as the ovaries begin to appear, the leaves of the cucumbers in the greenhouse first turn yellow, after which the lashes dry out. The fungus that causes this disease penetrates the plant and releases toxins that limit the supply of nutrients and trace elements to the leaves and stems.

The way to combat such a fungal infection is to regularly change the varieties planted in the greenhouse, as well as to partially replace the affected soil. Powdery mildew is also a fungal disease.

In this disease, the fungus blocks the processes of photosynthesis in the plant. First of all, small light spots appear on the cucumber leaves, which gradually spread to the entire surface of the leaf.

On all leaves of the plant, a whitish or reddish coating is observed on the upper surface of the leaf blade. After that, the leaves of the cucumbers in the greenhouse turn yellow and dry up. In order for the disease not to visit your greenhouse next season, you need to take a number of measures. First of all, when choosing varieties of cucumbers for the next season, pay attention to the resistance of one or another variety to powdery mildew, and also annually treat the soil in the greenhouse with potassium permanganate or green manure.

Downy mildew (pernosporosis)

The appearance of such a disease in greenhouses is facilitated by very densely planted plants, as well as excessive moistening of the air and soil in the greenhouse. The first signs of the development of peronosporosis are the appearance of yellow and light spots on the leaves, which are limited by veins.

In the future, the spots become oily and light yellow, and eventually turn brown. On the underside sheet plate, in those places where there are spots, a grayish-brown coating is formed. If no action is taken, the plant will die within a few days.

If the cucumbers in the greenhouse turn yellow, root rot can also be the cause of this phenomenon. Plants at any stage of development can suffer from this disease.

The reason for such a defeat of cucumbers can be a significant difference in night and day temperatures, as well as watering plants with cold and not settled water. Weakened plants are the first to be affected, and then other plants are infected through the soil. In order to prevent damage to plants by this disease, it is necessary to treat the root area with Previkur twice a season, according to the instructions.

insect pests

melon aphid

This pest prefers to “inhabit” the underside of cucumber leaves and feeds on plant sap, which is why cucumbers turn yellow in a greenhouse and in a greenhouse. melon aphid poses a danger to cucumbers throughout the summer season.

spider mite

This pest appears primarily on inside cucumber leaf, where it weaves small cobwebs. First, white or light yellow spots appear on the leaf, and then the leaves are completely covered with yellow spots and dry out. All through the warm days spider mite multiplies and if you do not fight it, for example, with the preparations "Akarin", "Tsimbush", "Fitoverm" and others, then you can lose all the plants in the greenhouse.

3. Disease and pests When pests or infection with any disease are detected, plants must be treated with appropriate solutions and preparations. 4. Yellowing of cotyledon leaves A clear sign of lack of light. Change the location of the seedling.

What to do if casting tomato seedlings turn yellow

As soon as you notice that cucumber seedlings turn yellow, urgently inspect the plants to identify the cause and take action. There is no need to put it off until later, it is possible to correct the situation tomorrow - it will be impossible.

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• A variety of pests are very common in the garden, because it natural conditions their habitats. They can be brought into the house from the street, for example, from ...

Why cucumber leaves turn yellow is often not so easy to understand, because there are many reasons and it seems that 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? Now let's find out.

Why cucumber leaves turn yellow: 6 reasons

The first reason is banal - some of the lower leaves inside the beds turn yellow and die from lack of light. This is not a cause for concern at all, it is normal.

As a rule, a cucumber bed is a real lush jungle, it is not surprising that light penetrates inside with difficulty and the lower old leaves lack it. In this case, just pick off the yellow leaves from time to time and enjoy the harvest. The second reason is a lack or excess of moisture.

In a normal summer, cucumbers are recommended to be watered abundantly two to three times a week, and in hot summer - every day, deeply wetting the ground. Otherwise, the roots of cucumbers will "get out" 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 see yellow leaves. The third reason is fungal diseases.

Most often it is fusarium, pitiosis and others fungal diseases are the reason yellow leaves on cucumbers. First appear on tops rust spots, then 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: fungi will not keep you waiting. The fourth reason is pests.

The whitefly or spider mite sucks out all the juices from cucumber leaves, as a result, the leaves turn yellow and die. In this case, the recommendations are clear: good pest- a dead pest.

You will either have to spray the bed with "poison", or save yourself with folk remedies. The fifth reason is the 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 may not have enough potassium or magnesium. Dark green veins against a background of yellowness can signal an iron or manganese deficiency. Yellowing upper leaves occur with a lack of copper.

Feeding will help to correct this situation. Well, last reason yellow leaves - old age. Over time, the cucumber leaf coarsens, ages, stops photosynthesis, turns yellow and dies. Most likely by this time you have already eaten cucumbers to satiety, and aging lashes do not bother you.

But if fresh cucumber right from the garden you want until the fall, there are ways to “prolong the life” of cucumber lashes, and we will talk about them later.

What to do if cucumber leaves turn yellow

The best cure for anything is prevention, and cucumber leaf yellowing is no exception. It is easier to prevent this from happening in your garden than to treat it later. Therefore: 1. Try to keep crop rotation.

Burns on cucumber leaves.

Do not plant cucumbers in the same place year after year, do not plant them after zucchini or pumpkin, otherwise the likelihood of “catching” will increase significantly fungal disease.2. Water your cucumbers regularly and generously.

If you visit the site only on weekends, do not be too lazy to mulch the beds well with weeds or mowed grass. thick layer mulch will not allow moisture to evaporate, as well as provide cucumber roots with additional nutrition and warmth.3.

After germination in the phase of 3-4 leaves (and then every 10 days), spray the cucumbers with the following composition: 20 grams of laundry soap, 1 liter of milk and 30 drops of iodine per 10 liters of water.5. Another option for preventive spraying: in the evening, soak a loaf of bread in a bucket of water, knead the bread in the morning and add a small vial of iodine.

Dilute one liter of this mixture in a bucket of water and process the cucumbers. If you repeat this procedure every two weeks, you can keep cucumbers green until autumn.6. In June, spill the cucumbers with a solution of soda (1 tablespoon per 10 liters of water).

Then the onion peel is squeezed, the broth is filtered and diluted in a ratio of 2:8 with water. Spray the leaves with this solution from above and below, and then spill the ground.8.

If you still didn’t save yourself and the leaves began to turn yellow, try spraying the cucumbers with a solution of whey or kefir (2 liters per 10 liters of water). For better fruit setting, you can add 150 grams of sugar to the solution.9.

When the leaves are just starting to turn yellow, watering with a weak solution of potassium permanganate can help. 10. To prolong fruiting and rejuvenate aging leaves of cucumbers, foliar top dressing with urea is carried out, while adding humus under the roots.

Spraying with infusion of rotten hay does an excellent job with the same task. To obtain an infusion, hay is soaked in water (1: 1) for two days. Spray cucumbers three times with an interval of a week.

11. To protect against pathogenic fungi and bacteria, use biological preparations (for example, trichodermin). They suppress harmful microorganisms, but are safe for humans and animals. We wish you success and great harvests!

Why do cucumber leaves dry? What to do if cucumber leaves dry?

Barsko 2 years ago natla 2 years ago

If the leaves of cucumbers began to turn yellow and dry, then you need to turn the leaf over and see if it's an aphid. Aphids feed on plant sap, so cucumber leaves turn yellow and dry. noticed chu on cucumbers - urgently take action, as aphids quickly infect healthy cucumber bushes, moving to new and fresh leaves.

You can use a soap solution in the fight against it, which is sprayed on the affected plants. Can also be applied chemicals protection, such as Iskra, Agravertin, Fitoverm and other aphid preparations. It is possible that the leaves turn yellow and dry due to damage downy mildew(peronosporosis).

This is a fungal disease. In order not to lose the crop, you need to take measures, for example, use drugs to combat this disease.

For example, the practically safe drug "Fitosporin", which not only fights a fungal disease, but also additionally serves as a top dressing for plants. I myself use "Fitosporin", and you can ask about other drugs in specialized stores.

Cucumbers grown in the country are fragrant and healthy. They differ significantly in taste from vegetables bought in the supermarket. But growing healthy cucumbers is not so easy, the plant is prone to many diseases.

How to distinguish pests on cucumbers from fungal diseases

Often summer residents are faced with the problem that the leaves of cucumber seedlings turn yellow. The problem begins when the second true leaf appears. The second leaves grow, and the first begin to change pigmentation.

Moreover, the matter may not be at all in the substrate in which the seedlings are planted. So why do cucumbers get sick at an early stage of development?

Why do cucumber leaves turn yellow?

There can be several reasons for burning leaves, the main ones include:

1. Lack of potassium, nitrogen, sulfur, calcium, manganese in the soil. An imbalance of nitrogen and potassium, the correct ratio of elements is 1 to 2. An excess of nitrogen affects the pigmentation of the foliage and can lead to ammonia poisoning. Insufficient watering affects the yellowing of seedlings in the same way as severe waterlogging. Temperature changes. If the temperature in the root zone drops below 17 degrees, then the plant is not able to take micro and macro elements from the soil. At this temperature, even if all the useful elements are in the soil, they do not enter the stem. Toxin poisoning. Some farmers put seedlings on foam boards. Yellowing can be caused by poisoning with chemical compounds that the insulating layer releases, since the roots of the plant are in contact with it. Fertilizer, getting on the foam, can lead to the release of harmful substances, which is dangerous not only for seedlings, but also for crops. Seedlings can be crowded in a peat cup, so many gardeners immediately sow seeds into the ground. Roots need space and good nutrition. Yellowing of the leaves may indicate that it is time to repot the plant. Lack of light.

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Cucumber leaves turn yellow: what to do?

• Balance the doses of fertilizers, do not exceed the ammonia content in the solution. With a lack of nitrogen, you need to fertilize the plant with Vermistim or Azogran. If a foam substrate is used, then lay it on top with a film. If the seedlings grow on the balcony, then you can use backlighting.
• Do not forget to monitor the microclimate. Cucumbers love water, so don't skimp on watering. However, remember that the plant should be watered only with warm water, street temperature. If you water the plant with cold water, diseases cannot be avoided. At the seedling stage, the plant is especially sensitive to a lack of potassium, if you do not follow the development, the cucumbers will grow irregularly. A nutrient solution based on complex fertilizers is best suited for seedlings of cucumbers. For example, Kemira Hydro.

But the leaves of cucumbers turn yellow along the edges, not only in seedlings, but also in an adult plant. This may be due to the fact that the plant is fully ripe. If the temperature is high in summer, and cucumbers are poorly watered, then yellowing is a natural process.