玉米疯顶病又称丛顶病、霜霉病。为玉米上的严重病害之一,世界上许多玉米产区都有发生。一、症状苗期表现为叶色浅,心叶黄化,叶片扭曲,严重的则植株枯死。成株期轻病株仅雄蕊局部变态,尚能抽穗结实,但籽粒不饱满。典型症状是植株节间缩短,矮化。雄蕊局部或全部增生, Maize crazy top disease, also known as Cong Ding disease, downy mildew. One of the serious diseases on corn, many maize producing areas in the world have occurred. First, the symptoms of seedling performance of the leaf color shallow, yellow heart leaves, leaves twisted, the worst is dead plants. Strain of adult plants only stamen local metamorphosis, still capable of heading, but the grain is not full. The typical symptom is shortening of plant internodes, dwarfing. Stamens partially or fully hyperplasia,