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时间:2020-05-22
《辣椒白粉病病株田间分布型研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、广东农业科学2014年第2期83辣椒白粉病病株田问分布型研究王萌,范咏梅,李璐,柳志强,张宇,杨叶(海南大学环境与植物保护学院,海南海口570228)摘要:辣椒白粉病是由辣椒拟粉孢[Oidiumtaurica(L6v.)E.S.Salman]危害引起的,利用6种空间分布型聚集度指标和LwaoMm回归法对辣椒白粉病空间分布型、不同发病程度与空间分布的关系进行研究。结果表明:辣椒白粉病发生期病株垂直分布下,病株在所有调查田块均属于聚集分布;植株中部、下部叶片水平分布规律,表明3个田块属于聚集分布,其他7个田块属于均匀分布;病情指数(DI)与频次检
2、验垂直分布型的关系,表明DI无论为何值时,垂直方向上分布型均为聚集分布,表现为点片发生;DI与频次检验下部叶片水平分布型的关系,表明DI在0.1827~0.5160间,呈负二项分布、NeymanA型分布,分布型为聚集分布,表现为点片发生;DI从大于0.5160至等于0.9951时,呈波松分布、二项分布或Poisson一二项分布,分布型为均匀分布,表现为连片发生;病情指数与频次检验中部叶片水平分布型的关系.表明病情指数在0.0623-0.5086问,呈负二项分布、Neyman(n)型分布,分布型为聚集型分布,表现为点片发生:病情指数从大于0.5
3、086至等于0.9858时呈二项分布、波松分布或Poisson一二项分布,分布型为均匀分布,表现为连片发生。关键词:辣椒;白粉病;病情指数;田间分布型中图分类号:$436.418.1文献标识码:A文章编号:1004—874X(2014)02—0083—04FielddistributionpatternofdiseasedplantofpepperpowderymildewWANGMeng,FANYong-mei,LILu,LIUZhi—qiang,ZHANGYu,YANGYe(CollegeofEnvironmentandPlantProt
4、ection,HainanUniversity,Haikou570228,China)Abstract:Pepperpowderymildewisanimportantdiseaseinpeppergrowingarea,causedbyOidiumtauricafL6v.)E.S.Salman.ByaggregateindicesandLwaoM*-mregression,6spatialdistributionpatternsandtherelationshipbetweendifferentdiseaseseverityandspati
5、aldistribution,werestudiedinthisresearch.TheresultshowedthatthediseasedplantsinaI1surveyplotswereaggregateddistributionunderverticaldistributionduringtheoccurrenceperiodofpepperpowderymildew.theleavesincentralandlowerpartofplantwerehorizontaldistribution,indicatingthatthree
6、plotswereaggregateddistribution,andothersevenplotswereevenlydistributed;therelationshipofdiseaseindexfDI1andfrequencvofinspectionoftheverticaldistributiontype,showedthatnomatterwhatvalueoftheDI.thedistributionpatternintheverticaldireetionwereaggregateddistribution,expressed
7、aspointandspaceoccurenceofthedisease.TherelationshipofDIandfrequencyofinspectionoftheleavesoflowerpartofplantwithhorizontaldistributiontype,withDIof0.1827to0.5160,wasthenegativebinomialdistribution,NeymanDistributionA,thedistribution—typewasaggregateddistribution.expresseda
8、spointandspaceoccurenceofthedisease;when0.5160
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