摘要
[目的]筛选出对美国白蛾高效低毒药剂,明确其致死、亚致死效应;延缓害虫抗性进程.[方法]室内采用饲毒法进行生物测定,统计农药的致死和亚致死效应.[结果]25％吡虫啉粉剂和4.5％高效氯氰菊酯乳油对美国白蛾2龄幼虫48 h LC50值分别为10.93、6.02 mg/L;当20％灭幼脲Ⅲ乳油、1.8％阿维菌素乳油、3％高渗苯氧威乳油有效含量分别为400、3.6、4 mg/L时,96 h对3龄美国白蛾校正死亡率分别达到20.0％、30.0％和10.0％;化蛹率分别降低43.0％、57.0％、50.5％;幼虫期较对照分别延长4、5、4d.[结论]美国白蛾密度高时,可以采用高效氯氰菊酯乳油和吡虫啉交替用药,密度低时,建议用另外3种药剂.
Abstract
[Aims] The fall webworm,Hyphantria cunea Drury (Lepidoptera:Arctiidae) is a pest case rampantly damage in forestry in recent years.To determine the lethal and sub-lethal effect of pesticides and to delay the process of resistance to webworm,the research was conducted in the lab.[Methods] The lethality of five kinds of pesticides,which are used to prevent the larvae ofH.cunea in practice,was tested and compared respectively by Feeding method in this experiment.And the lethal and sub-lethal effect of the pesticides to the growth was analyzed by reared in the lab.[Results] The results showed that the LC50 of imidacloprid 25％ DP and β-cypermethrin 4.5％ EC to the 2nd instar larvae of web worm was 10.93 and 6.02 mg/L respectively.While the corrected mortality to the 3rd instar larvae of fall webworm's achieved to 20,30 and 10％ treated by diflubenzuron Ⅲ20％ EC,abamectin 1.8％and high penetrable fenoxycarb 3％ EC at the effective concentration 400,4,3.6 mg/L in the field,respectively.Moreover,the pupation rate decreased by 43.0,57.0 and 50.5％,respectively,and 4,5,4 d of the larvae stage longer than CK group.[Conclusions] The β-cypermethrin 4.5％ EC and imidacloprid 25％ DP was chosen when the pests population is large enough,while the others were recommended to prevent the pests when they are in small quantities.The altemate of pesticides maybe slow down the resistance speed of the web worms in the practice.
基金项目
河北省“十二五”重点科技支撑计划资助项目(11230115D)
国家林业公益性行业科技专项资助项目(201004093)
河北农业大学博士基金()
NETL
NSTL
维普
万方数据