论文部分内容阅读
近年,我省棉花病虫害普遍严重,枯黄萎病面积660万亩,即是抗病品种“中棉12号”,在一些地区病株率也达到40—50％,烂铃病历史平均为8.1％,年损失2.33亿元;棉虫防治主要依赖化学农药,造成成本成倍上升,同时棉虫抗药性也不断增强,每年造成棉花减产1—2成。为此河北省农业开发办棉花病虫害控制研究课题组从1990年立项,经几年的研究,提出一季春播棉病虫害生态调控
In recent years, the cotton diseases and insect pests in our province are generally serious. The area of withered verticillium is 6.6 million mu, which is the resistant variety “Zhongmian 12”. In some areas, the rate of diseased plants reaches 40-50%, and the average history of bad bell disease is 8.1% , Annual loss of 233 million yuan; cotton insects mainly rely on chemical pesticides prevention and control, resulting in double the cost rise, while the resistance of cotton insects has also continued to increase, resulting in annual cotton cut 1-2. To this end Hebei Agricultural Development Office of cotton pest and disease control research project from 1990 to project, after several years of research, proposed a quarter spring cotton ecological control of pests and diseases