近年来,玉米黑粉病在阜城县普遍发生。1998~1999年发生较重,感病株率高达20%~30%,轻者也达4%~7%,从而对玉米高产构成了严重威胁。玉米黑粉病菌在土壤中或病株残体上越冬,少量也可通过种子越冬,并随风雨昆虫等传播。一般玉米黑粉病在苗期发病较少,抽雄后迅速增多,主要出现在玉米的叶 In recent years, corn powdery mildew occurred in Fucheng County. Occurred heavier in 1998 ~ 1999, the susceptible strain rate was as high as 20% ~ 30%, light also reached 4% ~ 7%, which posed a serious threat to high yield of maize. Corn powdery mildew in the soil or plant overwintering on the residue, a small amount can also be overwintering through the seeds, and with rain and other insects spread. Common corn powdery mildew disease less incidence at seedling stage, after the rapid increase after tasseling, mainly in the leaves of corn