冬季蔬菜种类多,如白菜、萝卜、甘蓝、红菜苔、莴苣、榨菜、花椰菜等。危害上述蔬菜的病虫,主要有霜霉病、软腐病、病毒病、菜蚜、菜青虫、猿叶虫等。蔬菜发生病虫害,一般减产10%-20%;严重时减产50%甚至绝收。特别是有些病害常借流水传播,因而遭受洪涝灾害地区更应高度重视。防治病虫,不仅直接关系到蔬菜的产量,而且关系到蔬菜质量的提 Many types of winter vegetables, such as cabbage, radish, cabbage, red cabbage, lettuce, mustard, cauliflower and so on. Pests and diseases that endanger the above vegetables, mainly downy mildew, soft rot disease, virus disease, aphids, cabbage caterpillars, such as vermin. Diseases and pests of vegetables, the general cut 10% -20%; severe cut 50% or even less. In particular, some diseases often spread by flowing water, so flood-prone areas should pay more attention. Pest control, not only directly related to the yield of vegetables, but also related to the quality of vegetables mentioned