玉米纹枯病是我市夏玉米的主要病害。为有效控制该病发生,笔者从1990年起对该病消长规律、发病因素、危害损失及防治技术进行研究。1田间消长规律 据几年多点观察,夏玉米纹枯病于7月上旬始见,7月中旬后期进入病害蔓延盛期,至8月中旬达发病高峰,病害由水平扩展转为垂直扩展,病菌侵染茎秆、穗位叶及苞叶,以后随着植株老健,病害缓慢下降。 Corn sheath blight is the main disease of summer maize in our city. In order to effectively control the occurrence of the disease, the author from 1990 on the law of the growth and decline of the disease, the risk factors, damage and prevention and control technology research. 1 field growth and decline rules According to several years of observation, summer corn sheath blight began in early July, mid-July into the peak of disease spread to the peak in the peak in August, the disease spread from the horizontal expansion to the vertical expansion, Pathogens invade the stalks, ear leaves and husk leaves, with the old plant health, the disease slowly declined.