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大白菜的病害主要有病毒病、软腐病、霜霉病、黑斑病等;害虫主要有菜粉蝶、菜螟、菜蚜、斜纹夜蛾等。这些病虫在大白菜生长期有不同程度的危害,只有进行综合防治,才能经济有效地控制病虫危害,提高大白菜的经济效益。一、选用抗病品种不同品种间的抗病性差异显著。一般直角型或青帮品种较抗病,圆球型或白帮型品种发病重。不同良种要搭配种植,避免品种单一化。二、种子处理1选种:应选无病株留种。播种前要精选种子,
The main diseases of Chinese cabbage are virus disease, soft rot disease, downy mildew, black spot disease and so on. Pests include cabbage butterfly, vegetable borer, vegetable aphid and spodoptera. These pests and diseases in the cabbage growth stage have different degrees of harm, and only comprehensive prevention and control in order to cost-effectively control pests and diseases harm and improve the economic benefits of Chinese cabbage. First, the selection of resistant varieties of different varieties of significant differences between the disease resistance. General right-angle or green Gangbian more disease-resistant, spherical or white-bodied varieties of the disease. Different varieties should be planted with planting, to avoid breed simplification. Second, the seed treatment 1 Selection: Leave the plant should be selected disease-free strains. Before sowing to select the seeds,