2015年任丘市春玉米瘤黑粉病危害较为普遍和严重。究其原因是春玉米5月上旬播种后持续的高温干旱天气,到7月17日突然降雨,正值玉米抽雄前后,这种特殊气候对玉米瘤黑粉病的发生极为有利。玉米瘤黑粉病又称玉米黑粉病,它是一种由真菌引起的为害幼嫩组织的局部性病害。由于连作、新品种推广,发病有上升趋势,此病受害减产多少与感病时期和菌瘤形成的部位、数量及大小有关。危害果穗严重的个别田可 Renqiu City Spring 2015 maize smut more common and serious harm. The reason is the spring corn in early May after planting high temperature and drought weather, sudden rainfall on July 17, just before and after corn tasseling, this special climate of maize powdery mildew is extremely beneficial. Maize powdery mildew, also known as corn powdery mildew, is a localized disease that is caused by fungi and injures young tissues. Due to continuous cropping, the promotion of new varieties, the incidence of an upward trend, the number of victims of disease reduction and susceptible stage and the formation of tumorous sites, the number and size. Individual fields that endanger serious ear may be