大白菜是我国北方各省的主要蔬菜,它的裁培面积大约要占秋季蔬菜的一半以上,供应时期也很长,初冬收获的可贮藏至次年三、四月,所以秋季大白菜生产的好坏,就会影响到正个冬季以及早春的蔬菜供应,对于广大人民生活的关系是很重要的。当前我国大白菜生产存在的主要问题是病害严重;除了软腐病,霜霉病发生很普遍以外,最近几年来病毒 Chinese cabbage is the main vegetables in the northern provinces of our country, its cutting area accounts for about half of the autumn vegetables, the supply period is also very long, winter harvest can be stored until March the following year, so the production of autumn Chinese cabbage is good Bad, it will affect the supply of vegetables in winter and early spring, and it is very important for the general people’s life. At present, the main problem existing in the production of Chinese cabbage is the serious disease. In addition to the occurrence of downy mildew, downy mildew is very common, in recent years, the virus