白菜三大病害(孤丁病、霜霉病、软腐病)是影响白菜增产的重要因素之一。在不同年分和地区内,这三种病害综合地或单独地侵害白菜造成各种湿度的损失。在华北地区,一九五二、一九五八、一九六○这三年是三个流行较大的年分,因为这些年分秋菜生长季节内气象条件有利于弧丁和霜霉病的大面积发生,软腐病则限于局部地区或个别地点发生。这三种病害在解放前虽然有很少的研究,但都还没有接触到防治 Three diseases of cabbage (Solitary disease, Downy mildew, Soft rot) is one of the important factors that affect the yield of cabbage. In different years and regions, these three kinds of diseases comprehensively or individually infringe cabbage cause various humidity losses. In North China, the three most populous years of 1952, 1958 and 1960 are the three most popular because the meteorological conditions during the growing seasons of autumn and autumn are favorable to arc and downy mildew Large area occurs, soft rot is limited to some areas or individual place. Although there are few studies on these three diseases prior to the liberation, none of them has come into contact with prevention and control