The Prevention and Cure of Three Diseases of Chinese Cabbage

Soft rot, downy mildew, and virus diseases are the three major diseases in Chinese cabbage production. They have a great impact on the yield of Chinese cabbage. When the disease occurs, the output is reduced by 20% to 30% and the weight is above 50%. Control methods: First, soft rot. Commonly referred to as "grubbing." At the beginning of the disease, the cabbage helps the base to form a water-soaked yellowish infiltrating area, which gradually turns yellow-brown. It is sticky, soft and rot-like, and the leaves are wilting. Finally, the roots are rotted and have bad odor. Control methods: sorghum cultivation, maintaining good drainage in the field, ventilation; timely sowing, to prevent premature aging; short irrigated long-term irrigation, timely drainage after rain, remove diseased plants before irrigation to reduce the spread of germs. In the early stage of disease, agricultural streptomycin 150-200 mg/kg or neomycin-containing 200 mg/kg solution may be used to spray the diseased plant and its surrounding petioles, so as to make the liquid flow into the Caixin, usually 7-10 days. Shi once, even spray 2 or 3 times. Second, downy mildew. The disease is mainly harmful to the leaves. It was initially a pale yellow or yellow-green lesion. It was yellowish-brown in enlargement, polygonal or irregular in shape. When the air is wet, a white to grayish creamy mildew layer develops in the diseased part of the lobe. The incidence of heavier disease after the rosette period, warm and humid weather conditions are conducive to the occurrence of the disease. Control methods: mainly agricultural control, supplemented by chemical control. Selection of disease-resistant varieties; rotation with non-cruciferous crops, preferably with paddy crop rotation; strengthening of fertilizer and water management. When the onset of the disease is discovered, the drug is sprayed in time. The commonly used agents include: 58% metalaxyl manganese zinc 500 times, 25% metalaxyl WP 800 to 1000 times, and 75% chlorothalonil wettable powder 600 times. , Or 40% of B-phosphate aluminum WP 200 to 300 times liquid and so on. Third, virus disease. Also called "cramps." When the Chinese cabbage was onset, the leaves appeared veins and mosaics, shrinking, distorting, necrotic spots, stripe spots, and plants exhibited dwarf flower malformations. Chinese cabbage could be susceptible to disease from the seedling stage to the heart-filling stage. The locusts are mainly transmitted and spread by the media. Control methods: In the selection of disease-resistant varieties, appropriate sowing, to ensure that the cabbage has sufficient growth period under the premise of drought and less rainy year, pay attention to watering the seedling stage, in order to reduce the soil temperature, root and strong seedlings. During the rosette period, the seedlings should be lightly or not seedlings. In the initial stage of disease, spray 20% of the virus A wettable powder 500 times, or 15% of the diseased emulsion 1000 liquid, spray once every 10 days, spray 2 or 3 times continuously. At the same time, it is possible to use chemical agents such as imidacloprid, chlorpyrifos, and fleas to control aphids in time to eliminate the media.

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