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玉米大斑病是由一种病菌侵害引起的。病菌主要侵害叶片,形成病斑。最初在叶表面生水浸状青褐色长圆形小斑,后逐渐扩大为5×55毫米大小的褐色或枯黄色的梭形或纺锤形的大斑,最大的病斑可长达一尺,宽达一寸以上。病斑边缘为深褐色,在潮湿的气候条件下,病斑上布满黑色霉状物,尤以叶背面为多,这就是病菌。发病重时叶片枯死,影响植物的光合作用,使玉米的果穗变小,籽粒不饱满或不结籽造成减产。玉米大斑病在我省玉米产区都有不同程度的发生,在夏季多雨高温的年份常流行为
The maize leaf spot is caused by a pathogen. The main bacteria damage leaves, the formation of lesions. Initially the surface of the leaf was oozed greenish brown oval small spots, and gradually expanded to 5 × 55 mm in size brown or brown fusiform or spindle-shaped large spot, the largest lesion up to one foot, More than an inch wide. The edge of the lesion is dark brown. Under humid climatic conditions, the lesion is covered with black mildew, especially the back of the leaf. This is a pathogen. Occurrence of heavy leaves withered, affecting the photosynthesis of plants, so that the ear of corn smaller, grain is not full or no seed resulting in reduced production. Corn blight in the corn producing areas in our province have varying degrees of occurrence, in the summer of the year the constant rainy high temperature behavior