12%虫螨腈·甲维盐悬浮剂对十字花科蔬菜主要害虫的生物活性及田间药效

Toxicity and effects of 12% chlorfenapyr·emamectin benzoate SC against main vegetable pests

室内毒力测定表明，12％虫螨腈·甲维盐悬浮剂对菜粉蝶、小菜蛾、斜纹夜蛾、甜菜夜蛾有很高的毒力，LC50分别为0．024、0．92、5．08、6．06mg／L，对甘蓝蚜毒力较差，LCs。为95．54mg／L，田间试验结果显示，12％虫螨腈·甲维盐悬浮剂有效成分18．0g／hm^2对菜粉蝶、小菜蛾、斜纹夜蛾、甜菜夜蛾具有优异防效，药后3d防效在80％以上，药后9d仍在90％左右，持效期10-15d。

The results of laboratory tests showed that the toxicity of 12% chlorfenapyr·emamectin benzoate SC against Pieris rapae （L.）, Plutella xylostella （k）, Prodenia litura Fabricius and Spodoptera exigua （Htibner） was very high, with the LCs0 values as 0. 024, 0. 92, 5. 08 and 6. 06 mg/L, respectively, but its toxicity against Brevicoryne brassicae （L） was weaker, with the LC50 as 95. 54 mg/L The results of field trials indicated that the reagents were significantly effective to the four above-mentioned species of pest insects, at the dosage of 18. 0 g/hm^2 , and the control effects were above 80% at day 3 and about 90% at day 9 after treatments. High effectiveness maintained for 10--15 days.