玉米丝黑穗病俗称“乌米”，是豫东地区玉米的主要病害，是由真菌 sphacelocheca reiliana侵染的，主要为害玉米的雌、雄穗。典型病症是雄性花器变形，颖片增生呈叶状，不能形成雄芯。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； Corn smut commonly known as “Wumei” is the major disease of maize in eastern Henan Province, is infected by the fungus sphacelocheca reiliana, mainly maize female, tassel. The typical condition is the deformation of male flower, glume proliferation was leafy, can not form the male core. Male flower base enlargement, within a pack of black powder. Black powder is not easy to fly in the early stage, the late dry easily scattered, showing a filamentous vascular bundle;