The ovaries and leaves of cucumbers turn yellow in the greenhouse, what to do
Cucumbers - favorite culture by many summer residents. Vegetables are grown both in open ground and in greenhouses. Often, various problems occur with landings. This, in general, is normal for personal subsidiary plots, where potent pesticides are not used to protect the crop.
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This time we will talk about such a common problem as yellowing of leaves in cucumbers that grow in a greenhouse. Consider why this can happen, and how to deal with it.
Causes of yellowing of cucumber leaves in a greenhouse
There is no single reason for the yellowing of cucumber leaves. But most often this is due to improper care of the plants. Consider the most common causes of this problem and solutions.
Cucumbers do not have enough food
With a lack of trace elements, the foliage of cucumbers begins to turn yellow. Most often, this problem happens when the culture is lacking in nitrogen. It is the deficiency of this element that leads to a change in the color of the sheet plates.
However, the lack of other trace elements can be determined by yellowed leaves. For example, with a lack of potassium, phosphorus and magnesium, the lower leaves turn yellow. While with a lack of nitrogen all leaves turn yellow and curl.
ON A NOTE. Micronutrient deficiency is possible with proper top dressing, but plentiful watering. Water leaches nutrients. Therefore, if you often have to water cucumbers, do not forget to additionally feed them.
What to do
Fertilize with a complex mineral fertilizer or ash solution. If there is not enough nitrogen, add urea or feed the sheet with a solution of ammonia.
Yellowing due to soil
Like any other culture of the pumpkin family, cucumber loves loose, well-ventilated soils with neutral acidity. The soil should be light and fertile, moist.
Heavy greasy, poor soils with a lack of nutrients are not suitable for growing cucumbers.
What to do
In this case, yellowing of the leaves will have to be fought constantly. At least three times per season will have to apply fertilizer to the soil to improve its structure.
If you know that the land in your greenhouse does not meet the conditions for growing cucumbers, either plant the crop in the open ground, or carry out early spring fertilizing of the soil. Of fertilizers, you can consider mullein, ash, nitroammophoska.
Cucumbers in the greenhouse planted too close
In an effort to plant as many plants as possible and get an increased yield from them, the summer resident planted cucumbers close to each other. As a result, instead of an abundant crop of Zelentsy, he receives diseased plants with dried leaves.
The fact is that plants planted too close to each other enter into competition for nutrients, sunlight and moisture. Such a struggle for a place under the sun leads to the fact that all plants weaken.
What to do
First, adhere to agricultural technology with regard to planting cucumber crops. If you have already made such a mistake, then pinch, tie up the cucumbers, make more fertilizers. But this is a last resort.
REMEMBER! Cucumbers need a place to grow lashes. Better plant less bushes, but they will bear more fruit than you will part and not get any harvest.
Plants lack light
This is a rather controversial reason. If the lower leaves have turned yellow on an adult bush, which either is already bearing fruit, or is about to give the first green leaves, then there is no need to worry. The dense foliage of the upper tiers does not allow sunlight, and the lower leaves are deficient in the sun.
If, from the very beginning, cucumbers grow in the shade or on the north side of the greenhouse, where the sun rarely falls, then this is already a problem. Do not wait for a good harvest. But the disease is likely to appear soon, because without the sun cucumbers weaken.
What to do
Cucumbers should be planted in the sun.
Watering is the most important agricultural technique, especially in a greenhouse. It sounds strange, but you need to be able to properly water the cucumbers. Firstly, do not pour cold water. Secondly, watering should be done under the root, and not from above. Thirdly, it should be regular, not too plentiful and not too scarce.
Most often, the leaves turn yellow due to excessive watering or watering with cold water from a hose.
What to do
Normalize watering, feed Athlete or Energen. It is also necessary to loosen the soil so that the roots receive air.
It is better to water cucumbers in the evening when the sun is setting.
Despite the fact that in a greenhouse it is easier to maintain a constant temperature regime, weather disasters also affect the culture growing in greenhouse conditions.
Stress associated with low temperatures is reflected primarily in the color of the leaf blades.
This is often the case if you forget to close the greenhouse at night. The second most frequent case is that the leaves are in direct contact with the walls of the greenhouse. As a result, when the temperature drops at night, the foliage turns yellow.
What to do
The ovaries, which have turned yellow from the cold, cannot be saved. They will fall. You need to normalize the temperature regime. At the next watering, you can add a little humate to the water to get a weak solution.
It also happens that cucumbers begin to turn yellow not from a lack of nutrition, but, on the contrary, from its excess. The high content of magnesium, potassium and phosphorus leads to the fact that the bushes begin to feel bad. Especially often this happens when using organic fertilizers, mullein and bird droppings.
What to do
First of all, stop any feeding. Perform regular watering. If the plants are not too fed, then soon they will depart and return to normal.
Diseases and Pests
Fungal diseases and exposure to parasitic insects are often the cause of yellowing of leaves in cucumbers. Of the most common diseases, Fusarium, powdery mildew, downy mildew, root rot, mosaic and bacteriosis can be noted.
Of the insects, cucumbers most often attack mites, aphids, whiteflies.
What to do
With the appearance of characteristic spots and the development of diseases, the affected bushes are destroyed, and healthy ones are treated prophylactically with fungicidal preparations (for example, Fufanon, Fitosporin, Bordeaux mixture, copper sulfate). When pests are found, as well as their egg clutches, Aktaru, Actellik and other insecticides are used.
To prevent the occurrence of pests and diseases, resistant varieties are chosen, pre-sowing preparation of seeds is carried out, as well as preventive treatments with folk remedies (kefir infusion, garlic solution, etc.).
Plants have a weak root system
Cucumbers are a culture that is very difficult to tolerate any manipulations with the root system. Therefore, the vegetable is advised to grow in a seedling-free way. Any damage to the roots immediately affects the condition of the entire bush.
Also, the roots can be damaged when weeding, loosening the soil. They can be stressed if they get icy water from a hose. They can also be damaged by insects and animals that live in the soil.
All this leads to the fact that the plant can not adequately receive nutrition from the soil. As a result, the leaves turn yellow.
What to do
Add a solution of Kornevin, Energen or any other root stimulant. However, this method does not give a 100% guarantee of solving the problem. If the root system is damaged too much, the bush will die.
Too many ovaries on cucumbers
In greenhouses, hybrids are mainly grown, which do not require pollination. A feature of such cucumbers is the formation of many ovaries. In this case, the ovaries form almost simultaneously. This leads to the fact that the bush does not have enough strength to feed the future greenbacks and maintain the life support of the rest of the plant. As a result, the leaves begin to turn yellow.
What to do
Restrict the formation and growth of new ovaries by pinching. Leave no more than 25 cucumbers on each bush. This will have a beneficial effect both on the plant itself and on the taste qualities of greenhouses.
Why do the ovaries (seeds) of cucumbers in the greenhouse turn yellow
The embryos of future greenbacks can turn yellow for many reasons related to the maintenance of the cucumbers (watering, feeding, thinning) for cucumbers.
You can deal with this phenomenon with the usual agricultural techniques: pinching, treatment with fungicides and insecticides, regulation of watering and fertilizing. Another effective method is digging. It helps with root damage. One lash sprinkled with earth and watered. Soon she will take root, which will feed the bush
Cucumbers turn yellow and dry in the greenhouse
Drying is a process inextricably linked with the yellowing of leaf plates. Therefore, all the reasons that cause a discoloration of the sheet are also true for drying. But most often this indicates a low humidity in the greenhouse. Cucumbers are simply not enough water.
Regular additional watering, loosening the soil and mulching can help with this. Mulch will delay the evaporation of moisture. Also remember to ventilate the greenhouse. This will normalize the microclimate in the greenhouse.
Yellow spots appeared on the leaves of cucumbers in the greenhouse
Yellow spots may indicate the spread of mosaics, ascochitosis, or other bacterial disease. 1% Bordeaux liquid will help to cope with the problem. Other medications containing copper may also be used. But do not forget that the infected plant must be uprooted and burned. The soil at this place must be shed with a fungicide solution.
Only the edge of the leaf turns yellow
If the color has changed only at the edge of the cucumber leaf, this means that the plant needs potassium. The solution to the problem is simple - feed the bushes of cucumbers. At the same time, it is much more efficient to use liquid fertilizers, which must be applied under the root. After top dressing, do not forget to carefully loosen the soil. Also, be careful that the solution does not fall on the leaves. This may cause a chemical burn.
What top dressing can be used from yellowing
First of all, one can advise gentle folk recipes - ash infusion and green fertilizers. The last remedy is prepared from 1 kg of finely chopped greens, which is poured with a bucket of water and insisted for a week. Next, the resulting concentrate is diluted with water in a ratio of 1 liter to 9 liters of liquid.
The second option is a complex fertilizer for pumpkin. Appropriate top dressing is sold everywhere. But do not forget to breed it in water.
The third remedy is urea, which is diluted in a proportion of 10 g of the product per 1 bucket of water. The resulting solution can be poured under the root or used for spraying.
ON A NOTE. If the listed funds do not help, then the problem is in the disease. Bushes need to be treated with appropriate preparations.
Folk methods of combating yellowing of cucumber leaves in a greenhouse
Alternative methods are, rather, preventive in nature. However, they are not complex and quite effective when it comes to disease prevention.
- When the seedlings appear 4 leaves, carry out such processing. In 10 l of water, dilute 25-30 drops of iodine, a bar of soap (for sticking) and 1 liter packet of milk. With this composition, process cucumbers every 1.5-2 weeks.
- The following composition processing can be carried out until the end of fruiting. It will help keep cucumbers, lashes and leaves to stay green. Spray need 2 times a month. Recipe - in 10 liters of water, break half the loaf and leave it overnight. In the morning, completely crush the softened roll and pour a bottle of iodine into a bucket. Mix everything thoroughly and strain. This produces a concentrate that must be diluted with water in a ratio of 1 to 10.
- A solution of kefir helps prevent fungal diseases. A fermented milk drink is diluted in water in a ratio of 1 to 5. You can also add a couple of tablespoons of sugar. Top dressing is carried out on a sheet.
Prevention is important if you want to spend less time saving seedlings in the future.
- Growing any vegetables in the greenhouse, do not forget about ventilation.
- Spraying with copper-containing drugs will prevent the development of many fungal diseases. You can use, for example, 1% Bordeaux mixture or a solution of copper sulfate.
- Perform preventive treatments and top dressing with folk remedies (infusion of onion peel, garlic infusion, bread and iodine, etc.).
- Observe the regime of watering and feeding. Cucumber is a moisture-loving culture, but you do not need to allow stagnation of water at the roots of the plant.
- Dress seeds before sowing. Preplant treatment will make cucumbers more resistant to adverse environmental conditions, as well as to the effects of pests and pathogenic microflora.
- Observe agricultural technology. Do not thicken the planting, carry out weeding, pinching and pinching in time.
- The problem is completely ignored. Some summer residents do not react in any way to changes in the color of leaves in cucumbers. They believe that this is a normal phenomenon, and, if a disease, the plant will cope with it on its own. Naturally, this is not so. The disease spreads, planting dies.
- The problem is solved too zealously. This is the opposite situation. Seeing that the leaves have changed their color, the summer resident immediately carries out all possible agricultural techniques. But instead of saving the plant, it only makes it worse.
Frequently Asked Questions
What if I can’t understand why the leaves of the cucumbers turn yellow?
Normalize watering, follow the feeding schedule, carry out preventive treatment with insecticides and fungicides.
Cucumber leaves began to turn yellow, what should I do?
First of all, determine the cause of this phenomenon. Next, take appropriate action to resolve the problem. For the most part, yellowing of the leaves can be eliminated by normalizing the care of cucumbers.
Will it affect the harvest?
If the problem is not solved, then yes. Zelentsy will be tasteless, and the crop will be scarce.
Which is better, purchased funds or folk methods?
Oddly enough, but in the case of cucumbers, it is better to use folk recipes. Use store preparations only for infections and pests.
Yellowing leaves on cucumbers means that not everything is in order with the plant. It is impossible to ignore such a signal, as this can be a sign of a serious illness. The faster you take the appropriate measures, the more chances to save the cucumbers.