玉米灰斑病在我国许多地区都有发生,从20世纪90年代开始已成为我国玉米主产区主要病害之一,特别是在东北辽宁、吉林局部地区发生严重,辽宁丹东地区玉米生长季节气温偏低、雨水较多、湿度较大是灰斑病的重发区,每年由于灰斑病导致玉米减产都在5%～10%。玉米灰斑病又称尾孢叶斑病,病原菌是玉蜀黍尾 Corn gray spot has occurred in many areas of our country and it has become one of the main maize producing areas in our country since the 1990s. Especially in the areas of northeast Liaoning and Jilin, the occurrence of corn gray spot is serious. The temperature of maize growing season in Dandong, Liaoning Low, more rain, humidity, gray spot is a recurrence area, each year due to gray spot caused corn yield in 5% to 10%. Corn gray spot disease, also known as Cercospora leaf spot disease, the pathogen is cornish tail