除草剂减量用药对稗草及狗尾草的防除效果评价

Evaluation of Reduced Doses of Herbicides Controlling Echinochloa crusgalli and Setaria viridis

比较3种除草剂对稗草及狗尾草的防除效果,并评价除草剂减量用药的可行性。结果表明,在稗草及狗尾草2叶期时用57%苯唑草酮·二甲酚草胺乳油进行防治,可以减少除草剂的使用量。同时,25%玉嘧磺隆悬浮剂和8%烟嘧磺隆可分散油悬浮剂减量用药对2叶期狗尾草也有较好的防效,但对稗草的防效不佳。因此,在稗草及狗尾草生长早期喷施合适的除草剂,可以减少除草剂的用量。

The efficacy of three herbicides controlling Echinochloa crusgalli and Setaria viridis was evaluated to assess the possibility of reducing their doses while maintaining adequate control. The dose of topramezone/dimethenamid （57% EC） could be reduced without affecting the level of control but in the case of rimsulfuron （25% SC） and nicosulfuron （8% OD） the level of control of E. crusgalli decreased when the dose of the herbicide was reduced. Results indicate that doses can be reduced if the appropriate herbicides are sprayed to E, crusgalli and S. viridis at early growth stages.