目前,防治玉米小斑病最经济有效的措施是采用抗病良种。它的抗性主要表现在病斑多少和大小两个方面。当前我国鉴定玉米抗病性的方法:一是分七级标准目测整株发病情况;一是分九级标准计算病斑占叶面积的百分率。在早期发病轻或 At present, the most economical and effective measure to control corn leaf spot is to use resistant varieties. Its resistance is mainly manifested in lesion size and size of two aspects. At present, the method of identification of maize disease resistance in our country is as follows: first, the incidence of whole plant is divided into seven levels; the first is the percentage of the leaf area accounting for nine levels. In the early onset of mild or