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ID:12166090
大小:7.39 MB
页数:36页
时间:2018-07-16
《杀虫剂对菜蛾绒茧蜂(cotesia plutellae)影响的研究论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、堡堡垒堡垒兰堕.生堡兰Abstract杀虫剂对菜峨绒茧蜂影响的研究Efiectsoffourinsecticidesondiamondbackmonthweretestedunderlaboratorycondition。Fourinsecticidesweremethamidophos、fenvalerate、avermection、fipronil.ResultsindicatedthatfipronilWaShiglllytoxicto2ndinstarofFIlarvaeofPlutellae.xylostella,thenwereavemaectiona
2、ndmethamidophos,thetoxicityoffenvaleratewaslowest.ResistancelevelstothefourinsecticidesinJp.xylostellaevariedduringdifferentseasons.Ingeneral,LC50ofthefourinsecticideswerehi曲inAutumnandlowinSpring.ApairofadultsofCotesia.plutettaewerereleaSedintoacagetoparasitize2ndinstarlarvaeso
3、fdiamondbackmoth2hafterlarvaesofP.xylostelIawerefeedwiththefourinsecticidesatsublethaldoses,respectively.ResultsshowedthatbothcocoonformationandadultemergenceofCptutettaedecreaSedcomparedwithcontr01.Amongdifferenttreatmentsconductedindifferentseasons,theratesofcocoonformationandadult
4、emergencewereonly10.3%~15.2%and54.8%~74.3%inmethamidophostreatment.14.8%~18.7%and75.O%~87.5%infenvaleratetreatment.17.5%~25.1%and80.1%~85.9%inavermectiontreatment.5.8%~7.4%and44.8%"--47.5%infiproniltreatment.respectively.WhiletheratesofCOCOOnformationandadultemergenceincontrolwere27.2
5、%~33.5%and99+2%~100%respectively.Inthefourdifferenttreatments,thedecreaSeofcocoonformationandadultemergenceWaSnotsignificantinavermectiontreatment,butsignificantinmthamidophosandfenvaleratetreatment,inparticular,extremelysignificantdecreasewasfoundinfipruniltreatment.Thedepression0nc
6、ocoonformationandadultemergenceofCvlutellaebythefourinsecticideswasfipronil>methamidophos>fenvalerate>avermection.Avermecfionwasrecommendedtouse4福建农林犬学硕:}二论文杀虫剂对菜蛾绒茧蜂影响的研究tocontroldiamondbackmothduringseasonswhenC.plutellaearerelativelyabundantinordertoprotectC.plutellae,whilefipr
7、onil,methamidophosandfenvaleratewerethoughttobeavoidtouseinthefieldfortheirhightoxicitytoCplutellae.TherateofcocoonformationandadultemergenceofC.plutellaevariedwhenthelarvaesofP.xylostellaigerefedwiththefourinsecticidesrespectivelyindifferenttimeinterval
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