玉米矮花叶病,又叫花叶病毒病。在整个生育期中均可感染此病,其中以苗期到7叶期发病最盛。被害玉米病叶褪色失绿呈斑驳花叶状,早期感染的幼苗,根茎腐烂,过早死亡。病株均有不同程度的矮化。发病早,矮化严重,果穗短小,甚至无果穗;发病迟,株高基本正常,一旦感染该病,将减产50%～70%。控制该病的综合措施主要有如下几点:一、选用抗病品种选用无病区种子及抗病品种,培育 Corn dwarf mosaic disease, also known as mosaic virus disease. In the whole growth period can be infected with the disease, of which the seedling stage to 7 leaves the most vigorous disease. The diseased maize leaf faded chlorosis was mottled mosaic leaflet, early infection of seedlings, rhizome rotten, premature death. Diseases have varying degrees of dwarfism. Early onset, dwarf severe, short ears, and even no ear; late onset, plant height basically normal, once infected with the disease, will cut 50% to 70%. Comprehensive measures to control the disease are the following points: First, the selection of disease-resistant varieties of disease-free selection of seeds and resistant varieties, breeding