玉米大斑病、小斑病、丝黑穗病和矮花叶病是玉米生产上的主要病害,分布于世界玉米产区,国内外的生产实践证明,病害发生和流行的程度,除适宜的气候条件外,还取决于品种的抗病性。因此,选育和种植抗病品种是控制病害发生和减轻为害的重要措施之一,玉米种质资源鉴定是选育抗病品种极为重要的基础工作,受到世界各国的普遍重视。我国 Maize leaf spot, leaf spot, head smut and dwarf mosaic disease are the main diseases in maize production. They are distributed in the corn producing areas in the world. The production practice at home and abroad proves that the degree of occurrence and prevalence of the disease are not only suitable Climatic conditions, but also depends on the variety of disease resistance. Therefore, breeding and planting disease-resistant varieties is one of the important measures to control disease occurrence and mitigation. Identification of maize germplasm resources is an extremely important basic work in breeding disease-resistant varieties, and has been widely valued by all countries in the world. My country