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玉米抽雄后,纹枯病就逐渐发生。纹枯病主要侵害叶鞘和叶片,后期也能侵害果穗和茎秆,严重时甚至侵害穗粒。侵害叶鞘时,先在植株基部叶鞘上出现水渍状的小斑点,并逐渐扩大成椭圆形的云纹状病斑,病斑边缘明显呈褐色,中央淡褐色或灰白包,潮湿时病斑呈灰绿色,水渍状半透明,以后病斑逐渐增多,互相连成一大块不规则的云纹,向植株上部叶鞘、叶片发展。叶片上
After corn tasseled, sheath blight gradually took place. Sheath blight mainly affects leaf sheaths and leaves, but also can damage ears and stems in the later stage, even inflict severe damage on grains. Invade the leaf sheath, the first on the base of the plant leaf sheath appeared water-like small spots, and gradually expanded into an oval-shaped cloud lesions, the edge of the lesion was significantly brown, central light brown or gray package, when wet lesions were Gray-green, water-like translucent, gradually increased after the lesion, interconnected into a large irregular cloud pattern to the upper leaf sheath plant, leaf development. On the leaves