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1、中國農(nóng)業(yè)科學院碩士學位論文蝗蟲綠僵菌病流行病學初探姓名：宋樹人申請學位級別：碩士專業(yè)：農(nóng)業(yè)昆蟲與害蟲防治指導教師：張澤華20080501AbstractEpidemiologyofMetarrhiziumanisopliaewasmadeintheDuolunCaimuMountainReservationAreainInnerMongolianThereale18grasshopperspeciesbelongingto7subfam

2、iliesincludingArcypteridae，Oedipodidae，Catantopidae，Oomphocefidae，Acrididae，PamphagidaeandTetrigidaewererecordedintheexperimentareaThecharacteristicsofgrasshopperpopulationdiversityindifferenthabitatenvironmentWasanalyze

3、dandtheresultshowedthatthepredominantspeciesWaSDasyhippusbarbipes(F一W：)intheearlyoccurrenceperiodChorthippusalbonemusChengetTuinthemiddleandChrothgppusfOIlax(zuboysky)inthelateTheShannon—WienerindexofdegradedgrasslandWas

4、lessthanthatoftypicalsteppeandtransitionaltypebetweenmeadowsteppetypeandtypicalsteppe，InadditiondesertificationofgrasslandresultsinthedecreaseofgrasshoppersdiversityindexandtheamountofOedipodidaeandPamphagidaewithbiggera

5、ppetiteandbiggersomatotypeindegradedgrasslandWashigherthanthatinothershabitatenvironmentMathematicalmodelsofpopulationdynamicshowedtheamountofmainpopulationswerefluctuatinginsinglepeakanddifferentfullincidenceperiodofspe

6、ciesresultedinthelongestdurationofhighpopulationdensityThus，theoptimumcontrolperiodshouldbebeforeJune22incurrentyearResultsofcageexperimentshowedthataffectedgrasshoppercouldspreaddiseaseofMetarrhiziumanisopBaetohealthWhe

7、ntheproportionofaffectedandhealthgrasshopperWas10：50，20：40，30：30and40：20，thetransmissionratebetweenindividualswithinsamespeciesWas246％，310％，390％and520％respectivelywhilethetransmissionratefromspeciesoccurringearlyinthesea

8、SontothoseoccurringlateWaS156％，235％，327％and400％respectivelyandthismayberesultedfrominterspecificdifferenceDiseaseofMetarrhiziumanisopliaecallspread400metersfarawayfromsprayingareaandtheaverageofinfectionratesfrom8directi

9、onsaroundtreatmentareawas895％at40daysaftersprayingandtheinfectionrateincreasedwithtimedelayingThelevelofinfectionratesfromdifferentdirectionsWasdifferentanditWasthehighestinnorthwestandsouthwesteast，north，southandnorthea

10、sttooksecondplace，southeastandwestwerethelowestThemigratorytendencyofgrasshopperandwinddirectionmayaffectthespreadofdiseaseDecreaseofgrasshopperpopulationhasbeenobtainedwiththespreadofdiseasefromsprayareaAt200metresdista

11、ncetothetreatmentareatheaverageofcorrectedmortalityfrom8directionswas4405％at42daysaltersprayingThecorrectedmortalityofdifferentdirectionsweredifferentfromeachotherthelevelofcorrectedmortalitykeepconsistentwithinfectionra

12、teindirectionsMetarrhiziumanisopliaeoilWaSsprayedonbandpattern，andtheresultSshowedthatmovingandfeedingbehaviorofgraSshoppercouldspreaddisease，alleffectivecontrolWasobtainedinnonsprayinginsecticideareabetweensprayedbandsT

13、hespatialdistributionofresidualgrasshoppersandcadaversafterMetarhiziumflavovirideoilsprayingwereanalyzedbysomeindexescomprehensivelyindifferentsampleintervalandverifiedwithTaylor’SPowerLawandimproved1wao’Sregressionmetho

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