近年来,随着农村种植结构的调整、耕作制度的改革、大面积使用化学除草剂,农田杂草优势种群和群落结构相应发生了变化。为掌握我市农田杂草种群结构和发生危害情况,为今后草害治理提供依据,合理使用除草剂,及时控制其危害,于1999年7～8月对所辖潍坊、奎文、寒亭、坊子四个区棉 In recent years, with the adjustment of planting structure in rural areas, the reform of farming system, large-scale use of chemical herbicides, dominant species of farmland weeds and their community structures have changed correspondingly. In order to grasp the structure and hazard of farmland weeds population in our city, provide the basis for the future control of grass and herbaceous crops, make rational use of herbicides and control their harm in a timely manner. From July to August 1999, we administrated Weifang, Kuiwen, Hanting, Fangzi four districts cotton