There are more than a dozen kinds of diseases in Chinese cabbage. Downy mildew and soft rot are common. They are fierce and serious. They are the two major diseases of Chinese cabbage and can cause Chinese cabbage to be reduced in production. The quality is poor, and the production is reduced by 10-15%. Absolutely. Prevention methods are as follows:

First, downy mildew

Symptoms: The highest incidence was from September to October. Start with the edge of the outer leaves and gradually expand inwards. The watery immersed lesions began to appear irregular. When the humidity in the field was high, there was a layer of white downy mildew on the back, and the lesions gradually turned yellow-brown. The lesions showed polygonal lesions along the veins. When the lesions became severe, the lesions formed a patch, causing the entire leaves to dry.

Control methods: 1, selection of disease-resistant varieties: such as Degao No. 1, Fengkang No. 4 and so on. 2, strengthen management, enhance plant resistance to disease. The disease is susceptible to the onset of diseases at high temperatures, and promotion of sorghum cultivation, early seedlings, late seedlings, and seedlings should not be too long, and the management of fertilizers and water should be followed. 3. Remove weed leaf from the field. Part of the downy mildew is overwintering on diseased leaf weeds, eliminating the source of bacteria. 4. Chemical control: At the beginning of the disease, 75% chlorothalonil 600-800 times solution, or 80% mancozeb 600-800 times solution, or 500 times as much aluminum as foliar spraying.

Second, soft rot

There are three types of symptoms:

Lanchuang: After 10 am, the initial disease strains began to wilt, and returned to normal every morning and evening. The lesions were not obvious on the leaves, but the base of the petiole began to rot and fall off, and the whole plant died in severe cases.

Wet heart-burning: Symptoms occur first in the heart, decaying with stench, gradually spreading to the base, and the outer leaves intact.

Dry heartburn: This type of illness is also an intact, disease-free spot on the outer leaves, while the edge of the heart leaf is yellow-brown and thin paper burns and does not rot.

Control methods: 1. The sorghum live broadcast to avoid the sowing of plots with high ground temperature and low geothermal heat. 2, timely prevention and control of pests and diseases, due to soft rot bacteria invade from the wound, it should be timely prevention and control of root peony, rapeseed meal, jaundice, etc., fine management, reduce mechanical damage. 3, chemical control: Agricultural streptomycin 150-200 times or agricultural chloramphenicol 150-200 times spray.

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