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Beware of downy mildew in autumn cabbage
Cabbage downy mildew, commonly known as "frost leaf," is the main disease of autumn cabbage. Failure to timely prevent and control will directly affect the yield and quality of Chinese cabbage and reduce its economic benefits. Cabbage downy mildew mainly occurs in the leaves, starting from the outer leaves first, appearing small yellow spots on the front of the diseased leaves, and gradually expanding into yellow-green irregular spots. When the weather is wet, the white mold layer on the back of the leaves produces drought. At the time, the lesions were dry and the lesions were severely connected and the external leaves were largely dead. As a result, cabbage does not contain the heart or bag, the quality declines, and the yield decreases. Comprehensive measures should be taken to prevent and treat it as soon as possible. 1. Seed Disinfection In the selection of good varieties with strong disease resistance, seed disinfection is performed before sowing. 75% Chlorothalonil or 25% Rhizoctonia may be used for dressing. The general dosage is 0.4% of seeds. 2. Rotation of autumn cabbage should not be used as a continuous crop. It should be done in alternate years with non-cruciferous crops. According to the climatic characteristics of different regions, suitable conditions for sowing date should be determined due to local conditions and varieties, and autumn cabbage should not be sown prematurely. In particular, the sowing date should be appropriately delayed in the areas with frequent disease and drought years. 3, to strengthen management First, the use of high-ridge cultivation to prevent field water; Second, and time Dingmiao, remove sick and weak seedlings to prevent late seedlings, the formation of thin and thin seedlings and high seedlings, reduce disease resistance; The third is a reasonable close planting, stay Seedlings can not be too dense; Fourth, pay attention to irrigation and drainage, and timely irrigation when drought, especially in the water-in-water period, but timely drainage in the rainy season; Fifth, scientific fertilization, in the application of sufficient organic fertilizer as a base fertilizer at the same time It is necessary to pay attention to the use of phosphorus and potassium fertilizers, to avoid excessive use of nitrogen fertilizers, and to pay attention to fertilizers in stages, especially the top-dressing period. Promote the steady growth of Chinese cabbage, enhance disease resistance. 4, rational use of drugs in the prevention and treatment of drugs, the following agents can be used alternately, sprayed once every 7-10 days, even spray 3-4 times, can receive significant control effect. 140% EB aluminum wettable powder 300-400 times liquid. 275% chlorothalonil wettable powder 600-800 times liquid. 325% of virucidal WP 800-1000 times. 450% Ketandan WP 500-600 times liquid. 565% zein zinc wettable powder 400-500 times liquid.