1988年10月初,我校农场温室栽培的黄瓜在白粉病发病率高达40％时,我们于10月10日利用“抗菌素120”稀释150倍,进行第一次叶面喷洒,15天后调查结果发病率下降低5％,随即第二次喷洒,15天后调查发病率下降到零。经喷洒两次“抗菌素120”后,黄瓜在后来生长过程中再没有发生白粉病。我们在月季、葡萄白粉病防治试验中也初步 At the beginning of October 1988, cucumber cultivated on farm greenhouses in our school had a high incidence of powdery mildew of up to 40%. We used 150-fold dilution of “antibiotic 120” on October 10 for the first foliar spray and after 15 days the results of the investigation Lower rate of 5%, then the second spray, 15 days after the survey fell to zero incidence. After spraying “antibiotic 120” twice, the powdery mildew did not occur in the later growth of the cucumber. We are also in the rose, grapes powdery mildew prevention and control trials are also preliminary