Chinese cabbage yellow leaf disease is one of the main diseases of Chinese cabbage, what is the harm

Chinese cabbage yellow leaf disease is a disease that many farmers and uncles particularly hate, because as long as Chinese cabbage suffers from yellow leaf disease, it will affect income. Chinese cabbage yellow leaf disease is one of the diseases that occur in many places, and it is also one of the main diseases of Chinese cabbage. If the disease is not treated after the disease is developed at the seedling stage, the growth of cabbage will be affected after planting.

Cabbage with Chinese cabbage yellow leaf disease grows very slowly, and half of the leaves will fade green and gradually turn yellow during the growth process. <>

Slow dehydration of Chinese cabbage may wilt the entire leaf, which looks particularly dehydrated. However, no matter how much the farmer watered it, the leaves would not return to their normal period, and after cutting open the taproot, the vascular bundles of Chinese cabbage would be found.

will turn brown. After pulling up the Chinese cabbage with Chinese cabbage yellow leaf disease, it was found that the root whiskers were very small, which is also one of the symptoms of Chinese cabbage yellow leaf disease. When the Chinese cabbage enters the middle stage of the wrapping center, the leaves and veins of the Chinese cabbage will fade and turn yellow. <>

Although the veins of the leaves fade and turn yellow, the leaves around the veins remain dark green. This color gives a very strange feeling, and in the later stage, the cabbage will slowly curl on the inside due to wet water until it dies. The cause of cabbage for cabbage yellow leaf disease is fungal infection.

There is a specific fungus that causes Chinese cabbage to suffer from yellow leaf disease. This fungus survives in the soil and causes burns to the roots of Chinese cabbage whenever it encounters drought. <>

Burned RootsThe cabbage grows very slowly after the burned roots, and there is no way to absorb enough water, so gradually the whole cabbage will cause disease. Chinese cabbage yellow leaf disease occurs in Sichuan, Hubei, Shaanxi and Yunnan, and the incidence is higher when it is cultivated out of season. Therefore, when planting cabbage, we must pay attention to the selection and use of disease-resistant varieties, and at the same time strengthen the management of cabbage.

The harm is very large, first of all, it will lead to a reduction in the yield of Chinese cabbage, and it will also lead to some spots on the surface of the Chinese cabbage, and it will also lead to some rot, and it will also lead to a reduction in farmers' yields and a decrease in economic benefits.

The harm is that it will affect the yield of cabbage, the quality of cabbage will be very poor, the leaves will be very yellow, there will be a lot of wormholes on the leaves, and the nutrients in the soil will not be absorbed.

The harm of Chinese cabbage yellow leaf disease is to cause the leaf veins of Chinese cabbage to fade and turn yellow, and Chinese cabbage will also be very short of water in the process of growth, Chinese cabbage will also have wilting symptoms, all the leaves begin to yellow, and finally develop into the whole Chinese cabbage is all dead, and Chinese cabbage yellow leaf disease will seriously affect the yield of Chinese cabbage, so the harm of Chinese cabbage yellow leaf disease is very large.

Onset is seen at the seedling stage. After the seedlings are fixed or planted, the growth is slow, half of the leaves fade green, causing half or the whole plant to wilt, like lack of water, pull up the diseased plant, have few fibrous roots, cut the taproot, and the vascular bundles turn brown. After the rosette to the early stage of the center, the leaves begin to yellow, and enter the middle stage of the center, the old leaves fade and turn yellow between the veins, and the veins around the veins remain dark green, and the posterior leaf margins lose water and shrink and curl inward, causing the plants to shrank or die.

It can be harmful at all growth stages, mainly to the leaves. Onset at seedling stage: white mold layer appears on the back of cotyledons, and seedlings die in severe cases.

Onset of adult plants: gray-white, pale yellow lesions with inconspicuous edges appear on the front of the leaves, and then expand into yellow-brown lesions, which are polygonal or irregular due to the restriction of leaf veins, and dense white mold layer on the back of the leaves. When there are many diseased spots, they are connected to each other, so that the diseased leaves die locally or the whole leaf.

Control methods Sow seeds at the appropriate time, and plant sparsely appropriately; Morning seedlings, late seedlings, moderate squatting seedlings; Frequent irrigation of small water, timely drainage after rain; apply plantar fertilizer, increase phosphorus and potassium fertilizer to enhance seedling potential; Remove the sick body and take it out of the concentration for deep burial or burning.

Seed treatment: Flurobacterium nail cream suspension seed coating agent and 25% methamanine wettable powder can be used to dress seeds according to the weight of seeds. In the early stage of the disease, the following agents can be used for prevention and treatment: zinc propylany; Dysenium, or fluoromycete downy mildewcarb.

Soft rot may occur, generally emitting a foul smell, there will be foliar wilting, you need to pay attention to watering, choose the right medicine for use.

Chinese cabbage downy mildew, or some diseases such as insects, need to remove weeds on time, pay attention to the selection of varieties, so that better control.

What diseases are there in cabbage now, we should be specific.

Common pests and diseases of Chinese cabbage mainly include: downy mildew, soft rot, virus disease, root swelling disease, anthracnose, black rot, black spot, aphid, yellow-striped jumping beetle, cabbage borer, diamondback moth, cabbage worm, etc. Chinese cabbage is prone to downy mildew, anthracnose, virus disease, etc. in the growth, and can be sprayed with pesticides such as Radidomir, leaf spot, carbendazim, etc.