赤霉病是小麦主要病害之一,广泛分布于世界湿润和半湿润的温带地区。我国主要分布于长江流域,以长江中下游地区发生机率最高,危害最重。河南省赤霉病时有发生,近几年有发展的趋势。1985年驻马店地区赤霉病发病率之高,流行范围之广,危害之重是建国以来所罕见。据调查,发病率达40 Fusarium head blight is one of the main diseases of wheat and is widely distributed in the humid and semi-humid temperate regions of the world. My country is mainly located in the Yangtze River valley, with the highest probability of occurrence in the middle and lower reaches of the Yangtze River, the hardest hit. Scab occurs in Henan Province from time to time, there are trends in recent years. In 1985, the prevalence of scab in Zhumadian area was high and its epidemic scope was wide. The harm was so heavy that it was rare since the founding of the People’s Republic. According to the survey, the incidence rate of 40