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玉米的小斑病(Helminthosporiummaydis)及大斑病(H.turcicum)是玉米的两种主要病害。分布很广,在我国多数省份均有发生。近年来这两种病害本省部分地区发生较为严重,造成一定的损失。这两种叶斑病在玉米上常混合发生,其发生比例及为害程度因年份及地区而有差异,有的年分有的地区以大斑病为主,有的年分有的地区则以小斑病占优势。1973年,本省东阳县等地玉米小斑病发生较为严重,据东阳县桑梓、虎鹿公社农科站调查,一般病情指数达60～70;重的达100,其中桑梓及虎鹿公社
Helminthosporium maydis and H. turcicum are two major diseases of maize. Widely distributed, have occurred in most provinces in our country. In recent years, these two diseases occurred more serious in some parts of the province, causing some losses. The two leaf spot disease in maize often mixed, the occurrence of the proportion and the extent of damage due to the year and the region are different, and some years to spot the big spotted disease, and some years are some areas Small spot disease prevails. In 1973, the endemic maize spot was more serious in Dongyang County of Dongyang County. According to the investigation of Sangzi and Donghu County Agricultural Science Station in Dongyang County, the general disease index reached 60-70 and the weight reached 100, among which,