What is the reason for the yellowing of cucumber leaves and the lack of straight melon strips? How t

It is generally infected by diseases, and it may also be that the soil lacks some nutrients; If it is infected by diseases, it should be controlled in time, and if it is a lack of nutrients, fertilizer should be applied in time.

lack of nutrients or temperature; Humidity and temperature can be adjusted, and the yellowing of the leaves can be fertilized, and the fertilizer can be diluted by watering after fertilization to reduce the damage to the cucumber roots.

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.

There are two reasons why cucumber leaves turn yellow, the first is caused by a lack of nutrients, and the second is caused by pests and diseases.

Lack of nutrients type cucumber yellow leaves:

In the normal growth of cucumbers, due to various reasons, nutrition can not keep up, the leaves will turn yellow, generally lack of nutrients, cucumber yellow leaves are divided into the middle and lower old leaves first yellow and the middle and upper young leaves first yellow two situations. The middle and lower leaves are yellow, and most of the missing elements are the elements that are easy to be reused in the plant, such as nitrogen, potassium, magnesium, zinc, etc. The middle and upper young leaves are yellow first, and most of the missing elements are the elements that are not reused in the body, such as calcium, sulfur, iron, etc.

Pest and disease caused type cucumber yellow leaves:

When growing cucumbers, if not properly managed, a variety of pests and diseases can occur, among which downy mildew and wilt can cause cucumber leaves to turn yellow. Downy mildew is a common and serious disease of cucumber during the growth period, which is mostly caused at the seedling stage, then the leaves fade green and yellow, and finally die. Fusarium wilt is commonly known as "dead seedlings", some leaves wilt at noon in the early stage of the disease, can recover in the morning and evening, and do not recover after a few days of recurrence, and finally the whole plant dies.

For the lack of nutrients in the cucumber yellow leaves can be sprayed to 1% urea solution 2 to 3 times, and for the pest caused type cucumber yellow leaves need to be sprayed with special agents for diseases, the common ones are Rui Poison Mold, manganese zinc 58% WP 500 times solution or 75% chlorothalonil WP, 50% lysate WP 600 times solution.

1. Element-deficient yellow leaves.

Element-deficient yellow leaves can be divided into two situations: middle and lower old leaves first yellow and middle and upper young leaves first yellow. The middle and lower leaves are yellow, and the missing elements are mostly the elements that are easy to be reused in the plant, such as nitrogen, potassium, magnesium, zinc, etc. (1) The growth of the whole plant is resisted, and the whole leaf lacks green first, which is nitrogen deficiency.

The control countermeasure is to spray urea solution 2-3 times on the foliar surface. (2) The whole plant grows without obvious resistance to the loss of green and yellow, the loss of green and yellow between the leaf veins, the leaf edge is green, or there are residual green spots, no curl, and magnesium deficiency. The control countermeasure is foliar spraying of 1%-2% magnesium sulfate solution.

3) There is no obvious inhibition of plant growth, and the leaf edge loses green to necrosis, and sometimes there are green to necrotic spots on the leaves, which is potassium deficiency. The control countermeasure is to spray potassium dihydrogen phosphate solution 2-3 times. (4) There is no obvious resistance to plant growth, and the whole leaf has green to necrotic spots or stripes, which is zinc deficiency.

The control countermeasure is foliar spraying of zinc sulfate solution. The middle and upper young leaves are yellow first, and most of the missing elements are elements that are not easy to be reused in the plant, such as calcium, sulfur, iron, etc. (1) The growth point is dead, and the leaves lose green, shrink to necrosis; The root system is underdeveloped, and it rarely bears melons, which is calcium deficiency.

Control measuresFoliar spraying of calcium chloride solution 2 times a week. (2) The growth point does not die, the leaf color is light green, and the stem is small and lacks sulfur. The control countermeasure is foliar spraying of 1% potassium sulfate solution.

3) The growth point does not die, and the leaf color is yellow and white, which is iron deficiency. The control countermeasure is foliar spraying of ferric sulfate solution.

2. Downy mildew yellow leaves.

Downy mildew is a common and serious disease that occurs during the growth period of cucumbers. At the seedling stage, the leaves turn green and yellow, and finally die. At the adult stage, the leaves are diseased, and they begin to appear water-stained yellow round spots on the back of the leaves, especially in the morning, and gradually develop into yellow-brown polygonal lesions with yellow-green edges.

Under high temperature conditions, a gray-brown mold layer grows on the back of the lesions, and in severe cases, the lesions become patches, the whole leaves are yellow-brown, and the leaf margins are curled and wilted. The prevention and control countermeasure is to use 500 times of Ruixinhua, manganese-zinc 58% wettable powder or 75% chlorothalonil wettable powder, 50% lysohydrate wettable powder 600 times liquid for foliar spraying, once every 7 days, generally spraying 3-4 times.

3. Yellow leaves of wilt.

Fusarium wilt is commonly known as "dead seedling". 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.

The main vine near the ground is brown and water-stained and rotten, thinning or longitudinally cracked, gradually drying up, and the whole plant is dead. Amber gelatinous flows out of the diseased part of the rhizome, and when the temperature is high, white or pink mold is produced on the surface, and when the stem or taproot is broken, the inside can be seen to turn brown. Prevention and control measures:

It is to irrigate the roots with 50% carbendazim 500 times of cherry wet powder, or 500 times of methyl tobuzine 50% wettable powder, each plant is not less than 250 m l, irrigated once in 5-6 days, and irrigated 2-3 times.

This can be caused by powdery mildew in cucumbers, or by the temperature being too high during maintenance.

How cucumbers are maintained.

1.Temperature: Cucumbers like a warm growing environment, the normal growth temperature is between 20 degrees and 32 degrees, not lower than 15 degrees, to avoid frostbite, high temperature should also be paid attention to, try not to exceed 35 degrees, otherwise it is easy to burn the branches and leaves, and the cucumber will also be dehydrated.

2.Watering: cucumbers during the growth period need sufficient water, which can promote the growth and development of seedlings, watering once every three days, and not more watering during flowering to prevent excessive watering and frequent flowering of plants.

3.Fertilization: Before planting, it is necessary to apply sufficient base fertilizer, which is conducive to the growth of seedlings, and at the same time, it can be topdressed many times during the growth period, mainly water-soluble fertilizer, and animal manure can also be topdressed, which can improve yield and enhance plant immunity.

Teach you three tricks to keep the leaves of green plants from yellowing!