玉米大斑病是真菌引起的病害,我省大部分玉米产区都有发生,尤以丹东、旅大的一些地区发生为重。近年来此病有所发展,个别年份很重,如七一年全省普遍发生,有些严重地块减产百分之三十以上,植株发病后叶片干枯,叶绿素减少,光合作用下降,干物质累积降低。重者全株提早枯死;轻者生长衰弱,籽粒秕小,品质降低,造成严重减产。 Maize leaf spot is a fungal disease caused by most of our province corn have occurred, especially in Dandong, Luda some areas as heavy. In recent years, the disease has been developed, individual years are very heavy, such as the general occurrence of the province in 1971, some serious block reduction of more than 30 percent, leaf blight after plant disease, chlorophyll decreased, decreased photosynthesis, dry matter accumulation reduce. In severe cases, the whole plant died sooner than others. The light ones grew weakly, the grains were small and the quality was reduced, resulting in serious decrease in yield.