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1、IdentificationandBiologicalCharacteristicAnalysisofPathogenCausingGrayLeafSpotofTomatoAuthor:HanChang-zhiSupervisors:ProfesswYangWen-xiangProfessorLiuDa-qunMajor:PlantPathologyAbstraetsTomatois011eofthemostwidelygrownvegetablesintheworld.nepopularityoftomatoamongconsumershasmadeit811impo
2、rtantsourceofvitaminsAandCindiets.However,tomatograyleafspotisbecomingmoreandmoreseriousinourcountrywithmoreimportedcultivarsplanted.Thediseaseisakindoffoliardisease,whichinitialsymptomswereleafspotswith2to4衄indiameter,irregularckcIllar,andgray-greenincolor.Thesedevelopwhitetograycenters
3、surtmmdedbyaredtobrownmargin.Lesionsmaybenumerouscausingleavestoturnyellow,thenbrownanddrop.Tomatowilldefoliatewhenthisdiseasehavehappenedseverityinthefiled,whichmayeffectthecharacteroffruit.Berilisavarietywithhi曲yieldandbeautifulfruit,goodrigidity,stronganti-rendingandlongerstoringchara
4、cters,bredintheHoland.Inordertoknowtheresistanceofthetestedvarietiestotomatograyleafspotverywell,thediseaseindexandthefrequencyofdiseaseleafwereanalyzedonthebasisofthesomesymptomsofdamageweredescribedinthefieldfromAp砌toNovemberin2006.Thepathogencausingthetomatograyleafspothasbeenreported
5、c越lsedbydifferentpathogensinthehomeandabroad.Inthisstudy,threepathogenscausingthediseaseweredeterminedbyKoch’SPostulateingreenhOUSt.Witllthebiologycharactersofthepathogen,theeffectivefungicideswerescreened.111emainresultswereshown船follows.1.Accordingtotheinvesteddataaboutthedamageoccurre
6、nceoftomatograyleafspotfromApriltoNovemberin2006,thedamageperiodandcharacterweredeterminedintheBerilvariety.TherelativehumidityWasthekeyfactorwhichaffectsthedevelopmentofgrayleafspotoftomatoduringagrowthperiod,inparticular,whichcanbeimprovedbytherainfallorthefloodingintheagriculturalmana
7、gement,WaSbeneficialtothedevelopmentofdiseaseandtransmissionofpathogen.Buttemperatureandlightwerenotimportantfactors.耵他characterofoccurrenceWasdefinedthatthediseaseatthebottomwasmoreseverethanthatinthemiddleandtopoftheplant,thediseaseinthemiddleoftheplantWasmoreseverethan