玉米黑粉病又名瘤黑粉病,是常见的玉米病害之一,以土传为主,风雨传播为辅,有多次再侵染。近年来,由于病菌残留处理不当,造成土壤病菌的大量积累,加之气候条件的适宜和品种特性的差异,造成了我市部分地区晚春播玉米该病较重发生,有些品种连年较重或严重发生。一、症状特征由玉米黑粉菌侵害所致。玉米黑粉病虽属局部侵染性病害,但在玉米的整个生育期间皆可发生。一般苗期发病较少,抽穗后发病迅速增多。植 Corn powdery mildew, also known as tumor powdery mildew, is one of the common maize diseases. It is mainly soil-based, supplemented by wind and rain, and re-infected several times. In recent years, due to improper handling of germs, resulting in the accumulation of a large number of soil bacteria, coupled with the appropriate climatic conditions and varieties of different characteristics, resulting in some parts of our city in late spring sowing the serious occurrence of maize, and some varieties year after year serious or serious . First, the symptoms characterized by the abuse of corn black powder caused. Although corn powdery mildew is a locally invasive disease, it can occur during the whole growing period of corn. Generally less incidence of seedling stage, the incidence of rapidly increasing after heading. plant