大白菜霜霉病是大白菜上的一种重要病害,每年均有不同程度的发生。过去一直使用代森锌防治,虽有一定的效果,但由于代森锌是一种保护剂,实际难以控制病害的流行。为了寻找更有效的防治药剂,1980年我们用上海农药厂生产的40%可湿性乙磷铝粉剂,进行了乙磷铝与代森锌防治效果对比和乙磷铝不同浓度防治试验。为了验证乙磷铝大面积防治效果,1982年我们在市郊区9500多亩大白菜 Chinese cabbage downy mildew is one of the most important diseases on Chinese cabbage, which occur in different degrees every year. In the past, detoxification has been used to prevent and control the disease, although it has a certain effect. However, due to detoxification zinc is a protective agent, it is actually difficult to control the epidemic of the disease. In order to find a more effective control agent, we used the 40% wettable powder of phosphorus and phosphorus produced by Shanghai Pesticide Factory in 1980 to compare the prevention and control effects of dephosphorization and dexamethasone and the prevention and control experiments of dephosphorylation of aluminum and phosphorus. In order to verify the large area of ​​phosphorus phosphorus prevention and control effect, in 1982 we in the suburbs 9500 acres of Chinese cabbage