注意大白菜黑斑病的流行呼盟地区近两年大白菜黑斑病发生流行，由过去的次要病害上升为主要病害。１９９４年秋季调查，发病严重地块发病率１００％，病情指数高达６１．５，一般病情指数都在３０左右，除大白菜外．其它的十字花科蔬菜也受害，甘蓝病情指数达３１．７８，... Pay attention to the epidemic of Chinese cabbage black spot Hudu area in recent two years the occurrence of Chinese cabbage black spot epidemic, the minor diseases from the past rose to the main disease. In the autumn of 1994, the incidence of serious disease was 100%. The disease index was as high as 61.5. The average disease index was around 30, except for Chinese cabbage. Other cruciferous vegetables also suffer, with a disease index of 31.78, ...