Cabbage black rot is a increasingly serious disease in the production of cabbage in china.Therefore, in order to improve the cabbage varieties resistance to black rot, it is very important to identify the resistance of germplasm resources to black rot by a convenient, rapid and reliable method. In this research, the methods of in vitro resistance identification of black rot was studied at the seedling stage of cabbage, and the resistance to black rot of different cabbage varieties was identified based on th...