近年来,小麦白粉病流行,为害严重.但我们发现,在同一年度同一地区的不同田块之间病情差异很大.有的麦田很少发病或发病很轻,有的则发病严重.据1984年调查,重病田病情指数达70左右.小麦发生白粉病后,不但病菌要消耗麦株养分,而且病叶提前枯黄,不能正常进行光合作用,使小麦生长衰 In recent years, the prevalence of wheat powdery mildew was devastating, but we found that there was a great difference in disease between different plots in the same area in the same year, and some were rare or very ill and others were severely ill. In the survey, the disease index of severe disease is about 70. After the occurrence of powdery mildew in wheat, not only the wheat germ to consume nutrients, but also in advance sick yellow leaves, can not be normal photosynthesis, so that wheat growth and decline