不同温度下抑食肼对小菜蛾幼虫的药效试验

Effects of RH 5849 Against Larvae of Diamondback Moth Under Different Temperatures.

利用人工气候箱，在设定的５种温度条件下，用叶片残留法测定了抑食肼（４００ｍｇ／Ｌ）及抑太保（５０ｍｇ／Ｌ）对小菜蛾２龄幼虫的药效。研究结果表明，抑食肼及抑太保对小菜蛾２龄幼虫表现为正温度系数药剂。抑食肼在高温（３３℃）时对小菜蛾幼虫的校正死亡率为８７．５０％，远高于低温（１７℃）时的结果（校正死亡率为２８．７７％）。抑太保在２５～３３℃之间药效差异不明显，校正死亡率在８７．５０％以上。

At five different constant temperatures,17,21,25,29 and 33℃, the effect of RH 5849 and IKI 7899 on 2nd instar larvae of diamondback moth was studied with leaf toxic residue method. The results showed that at temparature >29℃ with RH 5849 was more effcetive tham at <25℃, while at >25℃ treated with IKI 7899 was more effective than at <21℃.