Genotypic Diversity of Common Phytophthora Species in Maryland Nurseries and Characterization of Fungicide Efficacy

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dc.contributor.advisorBalci, Yilmazen_US
dc.contributor.authorBeaulieu, Justineen_US
dc.contributor.departmentPlant Science and Landscape Architecture (PSLA)en_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2015-07-17T05:34:03Z
dc.date.available2015-07-17T05:34:03Z
dc.date.issued2015en_US
dc.description.abstractThe genetic diversity of P. plurivora, P. cinnamomi, P. pini, P. multivora, and P. citrophthora, five of the most common species found in Maryland ornamental nurseries and mid-Atlantic forests, was characterized using amplified fragment length polymorphism (AFLP). Representative isolates of genotypic clusters were then screened against five fungicides commonly used to manage Phytophthora. Three to six populations were identified for each species investigated with P. plurivora being the most diverse and P. cinnamomi the least. Clonal groups that originated from forest or different nurseries suggest an ongoing pathway of introduction. In addition, significant molecular variation existed for some species among nurseries an indication that unique genotypes being present in different nurseries. Insensitive isolates to fungicides were detected with P. plurivora (13), P. cinnamomi (3), and P. multivora (2). Interestingly, insensitive isolates primarily belonged to the least common genotypic clusters. Because all but two isolates were sensitive to dimethomorph and ametoctradin, the ability of these chemicals to manage Phytophthora is promising. Nevertheless, the presence of two insensitive isolates could portend general insensitivity to these chemicals as well. Results from this study provide a foundation to future population determination and fungicide sensitivity of the plant pathogenic genus Phytophthora in Maryland's ornamental nursery industry.en_US
dc.identifierhttps://doi.org/10.13016/M2B92M
dc.identifier.urihttp://hdl.handle.net/1903/16790
dc.language.isoenen_US
dc.subject.pqcontrolledPlant pathologyen_US
dc.subject.pqcontrolledPlant sciencesen_US
dc.subject.pquncontrolledAFLPen_US
dc.subject.pquncontrolledFungicidesen_US
dc.subject.pquncontrolledMefenoxamen_US
dc.subject.pquncontrolledNurseriesen_US
dc.subject.pquncontrolledPhytophthoraen_US
dc.titleGenotypic Diversity of Common Phytophthora Species in Maryland Nurseries and Characterization of Fungicide Efficacyen_US
dc.typeThesisen_US

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