玉米圆斑病于1996年在乌兰浩特市玉米制种田中突然暴发。一般地块发病株率70%左右,严重地块达100%,造成平均减产率60%以上,最高减产率达80%以上。将田间采到的“兰单ＬＢ”玉米患病的茎、苞叶、果穗经吉林农业大学华致圃教授鉴定,病原菌为玉米圆斑病菌(Ｈｅｌｍｉｎｔｈｏ... Corn spot disease suddenly broke out in maize farming in Wulanhaote in 1996. In general, the disease rate of about 70% of the plots is about 100% in a serious block, resulting in an average yield reduction of more than 60% and a maximum yield reduction of more than 80%. Stems, bracts and ears of “Lancel LB” maize collected from the field were identified by Professor Hua Zhi Pu of Jilin Agricultural University, and the pathogen was Helminthoma.