玉米瘤黑粉病由瘤黑粉菌引发起病,属担子菌亚门,常危害玉米叶、秆、雄穗和果穗等部位的幼嫩组织,产生大小不一的病瘤,是我国玉米上同丝黑穗病一样分布最广,发生较为普遍的一种常见病害。1 发病特点及规律经调查:2004年玉米制种田中,凡发病的地块,病瘤决大多数发生在雌穗上,但雌穗有穗轴,且中、下部结有正常籽粒,仅在穗轴顶部形成角形簇状赘瘤, Maize tumor powdery mildew caused by the tumor of black fungus is a disease, is a basidiomycotina, often hazardous corn leaves, stalks, tassels and other parts of the ear tissue, resulting in different sizes of tumor, is China’s maize Same head smut distribution as the most widely occurring a common disease. 1 incidence characteristics and laws of the survey: corn farming in 2004, where the incidence of plots, the majority of the tumor occurred on the ear, but the ear spike, and the lower part of the normal grain, only in the Top of the cob form angular tufted neoplasms,