玉米丝黑穗病俗称“乌米” ,是豫东地区玉米的主要病害。主要侵染玉米的雌、雄穗。典型病症是雄性花器变形 ,颖片增生呈叶状 ,不能形成雄蕊。雄花基部膨大 ,内为一包黑粉。黑粉在前期不易飞散 ,后期干燥时易于散落 ,露出丝状的维管束。雌穗受害后果穗变短 ,基部粗大 ,除苞叶外 Corn smut commonly known as “Umi”, is the major disease in eastern Yedi. Main infestation of males, tassels. The typical condition is the deformation of male flower, glume proliferation was leafy, can not form stamens. Male flower base enlargement, within a pack of black powder. Black powder is not easy to fly in the early prophase, easy to disperse in the late dry, exposing the filamentous vascular bundle. Ears spike after ear damage becomes shorter, thick base, except bracts outside