影响丽蚜小蜂寄主搜寻行为的他感化学物质的分析

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1、塞坐!丛堂!!!!旦堡主竺堑竺堂焦笙苎AbstractEncarsiaformosaGahan，adominantparsitoidspeciesforcontrollingwhiteflyinthenorthofChina，couldparasitealltheinstarsofwhiteflyandcompletedevelopmentinthehosts．BBiotypesofBernisiatabaciandtheTria膪urodesvaporaiorurnWestwood．Theparasitoidusesinfochem

2、icalashostlocationcluewhensearchingforthehosts．Theeffectofplantandinsectinfochemicalsonthehost—searchingbehaviorofEncarsiaformosoGahanwerestudied．Theresultsaresummarizedasfollows：1．StatisticsfromparasitismbvE佑rmosatothehostnymphatsuitablestars(theendof3rdstarandthebegin

3、ningof4thstar)onthecucumberleavesshowedthattheparasitoidrateandthemulti．parasitoidrateofE．formosaonBBiotypesofB．tabactwere59775％and17．25％．whilethoseonTrialeurodesvaporaiorumWestwoodwere47．50％and2．00％respectively．TheresultsindicatethatEformosavisiblyprefersBBiotypesofBem

4、isiatabacitoTrialeurodesvaporaiorumWestwood．2．Comparisontestsamongthecucumberstreatedwithdifferentdensityofwhitefliesandofartificialporingweremadeusing⋯Y’tubeolfactometer．Theresultsshowedthat．ifthecucumbersweredamagedlightly，EformosashowednOsignificantselectiondifferenc

5、eamongthecucumbersinfestedby丑tabaei，rvaporaiorurnanddamagedmechanically．butshowedmoreselectionpreferenceonthemtotheintactcucumber．Whenthecucumbersweredamagedseverely，Eformosabehaveditspreference，andinasequence，fromstrongtoweak，of丑tabacidamaging，rvaporaiorumdamaging，them

6、echanicaldamagingcucumberandtheintact．Andthissuggestedthatthereshouldbesomevolatilesproducedbythedamagedcucumbers．3，Thekairomonesourcesincludingtheegg，1stto4thinstarsnymph，exuviae，bloodlymph，integument，honeydew，imagobodyandplumageofBBiotypesof县tabaeiwerebioassayedbythem

7、eansofnon—choiceandmulti—choicewithpetridishinlaboratoryTheresultsshowedthatB．tabacihoneydewwassignificantlyattractivetoEformosawithalongsearchingtime，tolocatethewhitefly，of518．4seconds；3rdand4thinstarnymphcouldcausetheparasitoidshowingactiveprobingbehavior(averageprobi

8、ngrate55％orhigher)，muchmoresignificantlythanthatcausedbytheothermaterialsused．4．Componentsofwhitefly’shoneydew