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1发病症状玉米纹枯病由立枯丝核菌侵染引起,该病原菌属于半只菌亚门真菌。除为害玉米外,还侵染水稻、小麦、高粱等各种禾本科作物,对玉米主要为害叶鞘、果穗和茎秆。在叶鞘和果穗苞叶上的病斑为圆形或不规则型,淡褐色、水渍状、病健部界线模糊、病斑连片合成较大型云纹状病斑,中部为灰褐色或枯草白色,边缘为深褐色,湿度大时发病部位可见到茂盛的菌丝体、后结成白色小绒球,逐渐变成褐色大小不一的菌核。有时在茎基部数节出现明显的云纹状病斑。病株茎秆松软、组织解
1 Symptoms of corn sheath blight caused by Rhizoctonia Rhizoctonia infection, the pathogenic bacteria belonging to half of the fungus subfamily fungi. In addition to corn damage, but also infect rice, wheat, sorghum and other gramineous crops, the main damage to corn leaf sheath, ear and stem. The lesions on the leaf sheaths and ear bracts are round or irregular, light brown, watery, the boundary of disease-health department is blurred, the lesion is contiguous to synthesize larger moire-like lesion, and the middle part is beige or hay White, dark brown edge, the incidence of humidity at the site can be seen lush mycelium, after the formation of white pompoms, and gradually become brown sclerotium of different sizes. Occasionally in the base of the basal section appeared obvious cloud-like lesions. Diseased stalk soft, tissue solution