大白菜在我国北方地区占全年蔬菜供应量的1/3左右。同时也是日本,朝鲜,东南亚等地的主要蔬菜。近年来由于人们对绿叶菜的兴趣增强,使西欧、北美的大白菜栽培面积也逐步扩大。 霜霉病和病毒病是白菜的两个主要病害。芜菁花叶病毒病普遍发生在十字花科蔬菜产区。尤易在白菜的苗期 Chinese cabbage in northern China accounted for about 1/3 of the annual supply of vegetables. At the same time is also Japan, North Korea, Southeast Asia and other places of the main vegetables. In recent years, due to the increased interest in green leafy vegetables, cabbage cultivation areas in Western Europe and North America have also been gradually expanded. Downy mildew and viral diseases are two major diseases of cabbage. Turnip mosaic virus disease commonly occurs in cruciferous vegetable producing areas. Particularly easy in the seedling cabbage