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玉米顶腐病是玉米生产上的一种新型病害,近几年来呈现逐年加重之势,特别是在高温多湿的年份及地势低洼的地块发病重。一般地块发病株率为5%~20%,对产量损失较大,生产上应早防早治。发病症状玉米从苗期到成株期,均可发生顶腐病危害,症状复杂多样。轻病株心叶白化变薄,由叶尖开始边缘枯死,无臭味,或仅在新叶边缘表现白化,枯死;重病株第十张叶片及以上叶片变褐腐烂,粘连不能展开而呈鞭状,
Corn top rot is a new type of disease in corn production. In recent years, it has been increasing year by year, especially in the hot and humid years and the low lying plots. In general, the incidence rate of the block is 5% ~ 20%, yield loss is greater, the production should be early prevention and early treatment. Morphological symptoms of corn from the seedling to adult stage, top-rot disease can occur, the complex and diverse symptoms. Light heart thinning albino heart thinning from the tip of the edge began to die, no odor, or only in the new edge of the edge of the performance of white, dead; ten severely diseased leaves and leaves of the first ten brown rot, adhesions can not start was whip shape,