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近年来,玉米病毒病(主要是粗缩病和矮花叶病)来势猛,发病面积大,轻者减产20％—30％,重者颗粒无收,并有逐年加重的趋势。由于目前尚无理想的抗病品种,又无特效药剂,因此,应以预防为主,开展综合防治。 玉米粗缩病:是由灰飞虱带毒传染,主要危害幼苗期春玉米和麦套玉米。幼苗发病后,病苗颜色浓绿,叶片僵直.宽短而厚,心叶不能正常展开,病株生长迟缓,植株明显矮化。长到9—10片叶时,上部节间不能抽长,粗肿短缩,顶部叶片丛生,植株高度只有健株的一半,多数不能抽穗结实。生长中期感病的植株,叶色浓绿,雄穗瘦小、畸形,结籽少,心叶展开后,叶脉上出现蜡白色隆起条纹,植株高度为健株的2/3。生长后期感病的虽能正常抽穗结实,
In recent years, the maize virus disease (mainly curative diseases and dwarf mosaic diseases) is fierce and the disease area is large. The light person reduces the output by 20% -30%. The heavy particles are not collected and has a tendency of increasing year by year. Since there is no ideal disease-resistant variety and no effective medicine, we should take prevention as the priority and conduct comprehensive prevention and treatment. Corn Roughness: It is infected by the brown planthopper, which harms the spring corn and wheat corn in seedling stage. After the emergence of seedlings, the seedlings color dark green, stiff leaves. Width is short and thick, the heart leaves can not be normal, slow growth of diseased plants significantly dwarf plants. Growing to 9-10 leaves, the upper internode can not be drawn long, swollen shortening, top leaf clusters, the plant height is only half of the healthy plants, the majority can not be heading strong. In the mid-growing season, the waxy green leaves appeared thin, malformed, and the seeds were few. After the heart leaves unfold, waxy white uplift stripes appeared on the veins, and the plant height was 2/3 of that of the healthy plants. Although the late growth of disease can be normal heading ear strong,