50%螟纹杀克可湿性粉剂防治水稻中后期螟害的药效试验

Chemical Efficiency of 50% Minwenshake on the Control of Rice Stem Borer

50 %螟纹杀克WP 10 5 0～ 135 0g/hm2 防治水稻二化螟 ,药后 7d校正防效达 93.7%～ 98.3 % ,药后 2 0d保苗率达 89.9%～ 97.0 % ;防治稻纵卷叶螟药后 7d校正防效达 95 .0 %～ 97.2 % ,药后 2 0d保叶效果达 84.7%～ 88.2 % ,优于对照药剂 5 0 %甲胺磷EC 180 0ml/hm2 和 18%杀虫双水剂 3 75 0ml/hm2 处理 。

The experiment indicated that the rate of control efficiency was 93.7%～98.3% in the seventh day and the rate of preserving seedling was 89.9%～97.0% in the 20 th day after 1050～1350 g/hm 2 of 50% Minwenshake was applied for the control of rice stem borer;the rate of control efficiency was 95.0%～97.2% in the seventh day and the rate of preserving leaf was 84.7%～88.2% in the 20 th day after 1050～1350 g/hm 2 of 50% Minwenshake was applied for the control of rice leaf folder;which control efficiency was much better than that of 1800 ml/hm 2 of 50% Jiaanlin EC and 3750 ml/hm 2 of 18% Shachongshuang and the difference among those treatments was significant.