玉米褐斑病是近年来在我国发生较重的一种玉米病害,在全国各地玉米产区均有发生,特别是河北、河南等地危害较重。 玉米褐斑病主要发生在玉米的叶片,叶鞘及茎秆。初期首先发生于顶部叶片的尖端,最初为黄褐色或红褐色小斑点,病斑 Maize brown spot disease is a serious maize disease occurred in our country in recent years, and it has occurred in maize producing areas all over the country, especially in Hebei and Henan. Corn brown spot disease occurs mainly in corn leaves, leaf sheaths and stems. The initial first occurred in the tip of the top blade, initially as brown or reddish brown spots, lesion