2.5%溴氰菊酯水乳剂防治烟青虫田间药效

Field Control Efficacy of Lambda-cyhalothrin 2.5% ME against Helicoverpa assulta

[目的]寻找烟草烟青虫有效的防治药剂。[方法]采用大田试验研究2.5%溴氰菊酯水乳剂防治烟青虫的效果。[结果]2.5%溴氰菊酯水乳剂在18.75和22.50 g/hm^2这2个处理浓度下对烟青虫的杀虫和防治效果最好,药后7 d平均残虫数为1.00,防治效果最高达91.02%。

[Objective] The aim was to find an effective medicament for prevention and control of Helicoverpa assulta. [Method]Field efficacy experiment was conducted to study control efficacy of lambda-cyhalothrin 2. 5% ME against Helicoverpa assulta. [Result] Lambda-cyhalothrin 2. 5% ME had good control effects to Helicoverpa assulta under the concentration of 18. 75 and 22. 50 g / hm^2,and average of live Helicoverpa assulta were 1. 00 and control effect reached 91. 02% after spraying 7 days.