Cucumber leaves yellow, dry edge shrinkage, what is the specific cause?

They felt that the ground temperature was low now, so after the cucumber was planted, they applied the rooting agent with the water when watering, and the amount used exceeded the recommended dosage of the product. The ratio of cucumber's requirement for nitrogen, phosphorus and potassium is: 1:

3, so 3 20 or 3 15 balanced fertilizer is actually 3 times more than the actual demand for phosphate fertilizer, too much phosphate fertilizer will hinder the absorption of calcium fertilizer, so there will be calcium deficiency.

<> common diseases that cause yellowing of cucumber leaves, such as blight, powdery mildew, gray mold, downy mildew, root rot, cataplexy, etc., the prevention and control methods in addition to the use of disease-resistant varieties, but also the use of drugs for chemical control, according to the specific yellowing symptoms analysis. If the old leaves at the base are yellow first, it may be that the cucumber lacks fertilizer, nitrogen, phosphorus and potassium, that is, the fertility of the soil is insufficient, and only an appropriate amount of compound fertilizer needs to be applied. If the fertilization is improper, the partial application of nitrogen fertilizer will also hinder the absorption of boron by the roots, and the excessive application of potassium fertilizer at the fruiting stage will also hinder the absorption of boron by the roots, which is easy to cause boron deficiency.

Fusarium wilt yellow leaves: Fusarium wilt is commonly known as "dead seedlings". In the early stage of the disease, some leaves wilt at noon, and can recover in the morning and evening, and do not recover after a few days.

The leaf color gradually changes from yellow-green to yellow-brown, and gradually expands to the whole plant from bottom to top. Sufficient magnesium-containing fertilizers should be applied before cultivation to avoid excessive application of potassium, nitrogen and other fertilizers that hinder the absorption of magnesium at one time. Contingency Method:

Spray the foliar surface with 1-2% aqueous magnesium sulfate.

There are two possibilities for cucumber wilting, one is that the greenhouse temperature is too high, the humidity is high, and the ammonia is heavy. The second is that the ventilation is too large, like a flash seedling. The third is that the low temperature is not covered in time or the wind blows the film open and is blown by the cold wind.

Acute wilting of cucumber physiological leaves belongs to underground pests biting cucumber roots, or even cloudy days and flood irrigation make the soil water content too high, resulting in obstruction of root breathing, and sudden sunny days or excessive evaporation of light and ventilation leaves.

Mainly because the sun is exposed to the sun for a long time, and there is no timely watering, so this kind of situation will occur, this time should be watered in time, this phenomenon will be avoided, and the future should also be more vigilant.

Because of the use of a large amount of rooting agent, vegetable farmers use excessive amount of rooting agent when watering when planting cucumbers, so the rooting agent flows into the roots with the water causing the yellowing of the leaves and the shrinkage.

This is a typical phenomenon of cucumber water shortage, which is easy to produce in summer sun exposure, so you should water the cucumber in the evening.

It is because of the lack of water, and the sun is exposed for a long time, and the light time is a bit long, so this situation will occur.

This is a deficiency disease, which can supplement the trace elements such as copper, iron, and silicon needed by cucumbers, and promote the growth of roots, stems, and leaves.

Cucumbers prefer to be warm, and the suitable temperature for growing is between 25 and 32. It can be watered appropriately during the growing period, every three days and every seven days during flowering. There is not much requirement for light, it is enough to receive light normally, and it can grow normally in full sunlight.

Sufficient basal fertilizer needs to be applied before planting, and top dressing needs to be continued several times during the growth period.

First, the maintenance method.

1. Temperature: cucumbers like a warm growth environment, the normal growth temperature is between 20 degrees and 32 degrees, low temperature can not be lower than 15 degrees, to avoid frostbite, high temperature should also be noted, try not to exceed 35 degrees, otherwise it is easy to be burned branches and leaves, so cucumbers will also be dehydrated, so winter breeding needs to be in the greenhouse.

2. Watering: cucumbers during the growth period need enough water, which can promote the growth and development of seedlings, watering almost every three days, and not watering more during flowering, to prevent excessive watering and frequent flowering of plants, so try to wait until the ground is all dry before watering, almost once every seven days.

3. Light: Cucumber does not have too high requirements for light, but it cannot stay in a dark environment all the time, it can accept full sunshine. There is no specific standard for a few hours of light every day, and strong light can be avoided in summer, and the gherkins that have just grown in the heart can be dried and wilted.

4. Fertilization: Before planting, it is necessary to apply sufficient base fertilizer, which can help the growth of seedlings, and at the same time can be topdressed many times during the growth period, mainly based on water-soluble fertilizer for fertile leaves, of course, animal manure is also available, which can improve the yield, increase the immunity of plants, and reduce the occurrence of some pests and diseases.

Second, breeding skills.

1. Reproduction: sowing is the main way of reproduction, can be planted in a large area, sowing can be carried out in the spring, the temperature at this time is also just right, after sowing to water thoroughly. Then, in order to prevent water loss, you can cover it with a layer of plastic wrap and press it gently afterwards to help the seeds grow.

2. Pruning: During the growth period of cucumbers, the branches and leaves may gradually age, and they can be cut off directly, because the aging branches and leaves do not have any effect, in order to prevent the loss of nutrients, they can be cut.

When the cucumber is still a seedling, if a leaf burn occurs, it usually starts from the edge of the leaf to the middle, then slowly turns black and dries out, and then the whole seedling dies. The fungus needs the right temperature and humidity to thrive, so leaf blight usually occurs around 20 to 30 degrees. The higher the humidity, the faster the onset of the disease.

As a result, it has been found that cucumber leaves are injured particularly frequently on rainy and wet days.

Cucumber leaf burn disease occurs mainly in the cultivation of protected areas. In the reserve, it is called a greenhouse. It is well known that the temperature in a greenhouse can reach up to 70 degrees on a hot day.

Such high temperatures cannot adapt to the growth of plants, let alone cucumbers. It is impossible for growers to make the temperature in the greenhouse so high. Mainly, cucumbers grown in greenhouses occur more frequently, while cucumbers grown in the wilderness occur less frequently.

The position of the genus leaves planted in the greenhouse is more serious near the greenhouse film. Solar radiation causes the greenhouse film to heat up, and then the heat from the greenhouse film affects the cucumber leaves.

Cucumber leaf burn occurs mostly in summer, and the symptoms are: dehydration of dry leaves on the plant and upper leaves, greening in the veins and more dehydration of dry leaves, mostly in spots and plaques. There is a phenomenon of scorching and dead leaves, and our rural hometown also vividly calls this disease pockmark.

The main cause of this disease is due to environmental factors such as sunlight and moisture. Therefore, after continuous rainy days, the weather clears, the temperature rises rapidly, and the light is strong. Leaf burns occur in the middle and upper parts of the plant, as well as in the greenhouse, near the roof membrane.

Cucumbers are grown in the open air, but with the increase in the demand for cucumbers in people's daily diets, especially the maturity of cucumber greenhouse cultivation technology, cucumbers have begun to move into greenhouses and can be grown all year round. For example, although growing cucumbers in a greenhouse has many advantages, it can greatly improve the yield and quality of cucumbers and increase the income of farmers. It is also easy to induce this disease due to strong sunlight and improper watering.

If cucumbers form scorched leaves, it must be that they lack calcium fertilizer, they lack a lot of calcium, so it will become like this, we should apply some fertilizer to him in time.

Under the conditions of high temperature and high humidity, the sudden release of wind causes the leaf water loss too quickly and too quickly, the salt content of the soilless cultivation medium is too high to cause salt damage, and the concentration is too high or the amount of medicine is too large when spraying the pesticide to gather at the leaf edge to cause chemical damage. The main reason for the occurrence of cucumber "scorched leaves" in greenhouses is caused by low ground temperature in winter.

Summary. The cause of "cucumber withered edge leaves" may be that the soil salt concentration is too high, which in turn causes salt damage. Or in the case of high temperature and high humidity in the shed, the wind is suddenly amplified, and the leaves lose water too quickly; It is also possible that when spraying pesticides, the concentration of the liquid medicine is too large, and the liquid medicine is too much, and the dripping leaves on the edge of the leaves cause pesticide damage; Then there is the lack of nutrients, such as potassium and calcium, which may cause "cucumber withered leaves".

What is the cause of the sudden wilting of the middle leaves of cucumbers?

Hello, it's an honor for me to answer your questions, it will take a little time to sort out the answers, please be patient

The cause of "cucumber withered edge leaves" may be that the soil salt concentration is too high, which in turn causes salt damage. Or in the case of high temperature and high humidity in the shed, the wind is suddenly amplified, and the leaves lose water too quickly; It is also possible that when spraying pesticides, the concentration of the liquid medicine is too large, and the liquid medicine is too much, and the dripping leaves on the edge of the leaves cause pesticide damage; Then there is the lack of nutrients, such as potassium and calcium, which may cause "cucumber withered leaves".

The cause of "cucumber withered edge leaves" may be that the soil salt concentration is too high, which in turn causes salt damage. Or in the case of high temperature and high humidity in the shed, the wind is suddenly amplified, and the leaves lose water too quickly; It is also possible that when spraying pesticides, the concentration of the liquid medicine is too large, and the liquid medicine is too much, and the dripping leaves on the edge of the leaves cause pesticide damage; Then there is the lack of nutrients, such as potassium and calcium, which may cause "cucumber withered leaves".

The leaves are shrunken. Cause: When cucumbers are boron deficient, the leaves will shrink.

The leaves shrink along the leaf veins, the leaf veins are twisted, the leaf outward roll is deformed, the leaf margins are irregularly green and yellow, and the yellowing parts are linear. In severe cases, the leaves near the growing point shrivel and dry up. The shrinkage of cucumber leaves is mainly due to the lack of boron fertilizer.

Pesticide damage, fertilizer damage, and drastic changes in temperature may cause cucumber leaves to shrink. Cucumber viruses can also cause leaf shrinkage. The lack of the trace element boron in cucumber plants causes cucumber leaves to shrink.

1.Overview.

Cucumbers are a widely cultivated vegetable that is commonly found during the summer months. However, cucumber plants can be affected by various factors such as drought, pests and diseases, nutrient deficiencies, and many more. Among them, yellowing and drying of cucumber leaves is one of the most common problems, which is also the result of insufficient nutrition and lack of water in cucumber plants.

2.Undernutrition.

Cucumber plants need soil that contains elements such as nitrogen, phosphorus, potassium, magnesium, etc., to maintain nutrient balance. If the soil contains too little of any element, the cucumber plant will have yellowing of its leaves. For example, nitrogen deficiency can cause leaves to turn yellow and shrivel, and phosphorus deficiency can cause plants to grow slowly and even die early.

3.Lack of water.

Cucumbers are water-loving plants that need plenty of water to maintain healthy growth and fruit development. If the cucumber plant is deprived of water, you will notice that the leaves start to turn yellow, dry, and curly. There are more and more yellow spots on the leaves, which are caused by the loss of water during transpiration.

4.Pest and disease infections.

The leaves of cucumber plants can also be infected with various viruses and fungi that can form spots on the leaves, causing the leaves to turn yellow, dry up, and eventually die. Pests such as aphids, mites, and termites can also cause damage to cucumber plants, causing the leaves to be soft, deformed, dry, and have yellow spots.

5.Environmental factors.

Environmental problems such as deformed soil structure, low temperature, heat damage, and lack of light will cause cucumber leaves to turn yellow and dry. When growing cucumbers indoors, make sure the cucumber plants are exposed to enough sunlight and at the right temperature. When growing cucumbers outdoors, be sure to take into account the local climate conditions.

6.Repair the method of preventing cucumber leaves from turning yellow and dry.

The way to fix the yellowing and withering of cucumber leaves depends on the source of the problem. If cucumber plants lack water, water can be poured into the soil for watering. If there is a deficiency of an element in the soil, you can add the corresponding fertilizer and regularly check the pH of the soil.

If infected with viruses and fungi, it can be done with effective medications**. If you encounter a pest, you can use an insecticide to control it. If environmental problems cause cucumber leaves to turn yellow and dry, you can adjust the environmental factors to make them suitable for the growth of cucumbers.

7.Conclusion.

Yellowing and withering cucumber leaves is a common problem, but it is not unsolvable. By analyzing the root cause of the problem and finding the appropriate solution, we can restore the healthy state of cucumber leaves. This also helps us better understand the growth of cucumber plants, the cultivation of vegetables and effective control measures.