番茄灰叶斑病病原鉴定与其生物学特性的研究

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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