玉米大斑病是世界春玉米产区分布较广,为害较重的重要病害。国内主要分布于黑龙江、吉林、辽宁、内蒙、山西、河北的北部、陕西的大部地区、甘肃的天水、山东的胶东沿海、以及云、贵、川、鄂、桂等省区的春玉米上。为查明我国大斑病菌生理小种的类群和分布,自1977～1979年三年冬季在温室里进行了大斑病菌生理小种鉴定工作,本文是三年的鉴定结果。 Maize leaf spot is the world wide distribution of spring corn production, serious damage to important diseases. China is mainly distributed in Heilongjiang, Jilin, Liaoning, Inner Mongolia, Shanxi, northern Hebei, most of Shaanxi, Tianshui in Gansu, Shandong coastal Jiaodong, and Yunnan, Guizhou, Sichuan, Hubei, Guangxi and other provinces on the spring corn . In order to identify the taxa and distribution of Saprolegniasis species in China, the identification of Saprolegnia melopestris was carried out in greenhouse in the winter of 1977 ~ 1979. This article is the result of three years’ identification.