二点委夜蛾幼虫防治药剂的筛选及活性影响因素初步分析  

Screening of insecticides for larvae of Athelis lepigone (Mschler) and analysis of their activity influential factors

作　　者：秦秋菊[1] 刘顺[1] 杨向东[1] 李哲[1] 

机构地区：[1]河北农业大学植物保护学院,河北保定071000

出　　处：《山东科学》2014年第3期34-38,56,共6页Shandong Science

基　　金：现代农业产业技术体系建设专项资金(CARS-02);河北省强势特色学科资助项目

摘　　要：二点委夜蛾是近年来严重危害夏玉米的一种新害虫,筛选有效的化学药剂对于其田间防治有重要的指导意义。本文采用浸虫法测定了12种常规杀虫剂对采自田间的二点委夜蛾5龄幼虫和室内饲养的4龄幼虫的触杀效果。供试药剂中40%辛硫磷乳油、480 g·L-1毒死蜱乳油及4.5%高效氯氰菊酯微乳剂对二点委夜蛾4龄和5龄幼虫的触杀效果相对较好,其他杀虫剂触杀效果较差。40%辛硫磷乳油、480 g·L-1毒死蜱乳油、4.5%高效氯氰菊酯微乳剂对二点委夜蛾4龄幼虫72 h的LC50值分别为0.244、0.308和0.406 mg·L-1,相对毒力指数分别是30%乙酰甲胺磷乳油的5.9、4.7和3.6倍。杀虫剂对二点委夜蛾幼虫的触杀活性与活性测定方法、杀虫剂种类、剂型、当地用药情况以及幼虫的龄期等因素有关。建议生产上优先选用辛硫磷乳油、毒死蜱乳油和高效氯氰菊酯微乳剂在二点委夜蛾低龄幼虫期进行喷雾、灌根或毒土防治。Athelis lepigone （M（o）schler） is a new pest doing serious damage to summer corn.Selecting effective insecticides can guide its field prevention and control.We employed dipping method to determine the contact toxicity of 12 kinds of insecticides to field-collected 5th and the laboratory bred 4th instar larvae.Results indicate that 40％ phoxim EC,480 g · L-1 chlorpyrifos EC and 4.5％ beta cypermethrin EW have better poisonous effects on 4th and 5th instar larvae.The LC50 of 40％ phoxim EC,480 g · L-1 chlorpyrifos EC and 4.5％ beta cypermethrin EW to 4th instar larvae of A.lepigone are 0.244 mg · L-1,0.308 mg· L-1 and 0.406 mg · L-1 after 72 hours.Their relative toxicity indexes are 5.9,4.7 and 3.6 times that of 30％ acephate EC.Poisonous activity of insecticides to A.lepigone depends on insecticide type,formulation type,local insecticide employment history and the instar of larva.Phoxim EC,chlorpyrifos EC and beta cypermethrin EW should be preferentially selected to perform spraying,root pouring or insecticide mixed earth in the period of low-age instars of A.lepigone.

关 键 词：二点委夜蛾 化学药剂 活性 

分 类 号：S481.4[农业科学—农药学]