玉米粗缩病是由灰飞虱传播的一种病毒病害。染病植株有的出现扭曲生长,有的发生严重矮化,节间缩短呈丛生状,叶色浓绿,叶片变厚,短而宽,硬而脆,密集丛生。5片叶前感病,一般不能抽穗;7叶后感病仍能拙穗结实,但果穗小而畸形。由于植株感病后,目前没有理想的药剂防治,对玉米生产危害很大。96年玉米粗缩病在山东省大发生给玉米生产造成严重损失,为 Corn rough is a virus disease transmitted by the planthopper. Some plants appear distorted growth, and some serious dwarfing, internodes shortening was clustered, dark green leaves, thicken the leaves, short and wide, hard and brittle, dense clusters. 5 leaves before the disease, the general can not be heading; 7 leaves after the disease can still be strong ginkgo, but ear small and deformity. Due to plant disease, there is no ideal agent control, a great harm to the production of corn. In 1996, maize disease caused serious losses to maize production in Shandong Province