杀虫剂对菜蛾绒茧蜂(cotesia plutellae)影响的研究论文

杀虫剂对菜蛾绒茧蜂(cotesia plutellae)影响的研究论文

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时间:2018-07-16

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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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