论文部分内容阅读
玉米粗缩病是一种由灰飞虱传播的病毒病早在1954年在新疆和甘肃发现,20世纪70年代以后在东部各省均有所发生,自20世纪90年代开始在我国华北、西北和东北的部分地区大面积发生以来,危害逐年加重,局部地区暴发成灾,甚至出现绝产,严重威胁我国玉米的生产安全。近几年在我市呈逐年加重发生趋势,对玉米生产造成严重影响。1发病症状玉米整个生育期都可感染发病,以苗期受害最重。在玉米5～6片叶即可显症,心叶不易抽出且变
Corn rough disease is a virus transmitted by the Laodelphax striatellae disease as early as 1954 in Xinjiang and Gansu Province found that after the 1970s in the eastern provinces have occurred since the 1990s began in North China, Northwest China and Since the occurrence of large areas in parts of northeast China, the harm has been increasing year by year, the outbreaks in some areas have become disaster and even the absolute ones have emerged, which seriously threaten the production safety of corn in our country. In recent years, the trend of increasing year by year in our city shows a serious impact on corn production. 1 symptoms of corn throughout the growth period can be infected with the disease, the heaviest seedling victims. 5 to 6 leaves in corn can be obvious disease, heart leaves are not easy to extract and change