白菜霜霉病(Peronospora parasitica (Pers.)Fr.)是白菜生产上重要病害之一,在北方秋菜和种菜上危害严重,是生产上极待解决的问题。田间观察,白菜不同品种对霜霉病的抗性有明显差异。为了探索霜霉菌侵染过程与白菜不同品种抗病性的关系,我们于1984～1985年进行了此项研究。 Cabbage downy mildew (Peronospora parasitica (Pers.) Fr.) Is one of the most important diseases in cabbage production. It is a serious problem in the production of autumn vegetables and vegetables in northern China. Field observation, cabbage different varieties of downy mildew resistance were significantly different. In order to explore the relationship between the infection of downy mildew and the disease resistance of different varieties of cabbage, we conducted this study from 1984 to 1985.