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Intraspecific variability of Geosmithia morbida the causal agent of thousand cankers disease, and effects of temperature, isolate and host family (Juglans nigra) on canker development

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dc.contributor.authorFreeland, Emily, author
dc.contributor.authorTisserat, Ned, advisor
dc.contributor.authorLeach, Jan, committee member
dc.contributor.authorCranshaw, Whitney, committee member
dc.contributor.authorKlett, James, committee member
dc.date.accessioned2007-01-03T08:06:06Z
dc.date.available2007-01-03T08:06:06Z
dc.date.issued2012
dc.description.abstractSince the mid-1990's widespread mortality of Black Walnut (Juglans nigra) in the western United States has been noted. This mortality is the result of aggressive feeding of the Walnut twig beetle (Pityophthorus juglandis) and subsequent canker development caused by the newly named fungus Geosmithia morbida. Thousand Canker Disease (TCD) has been confirmed in Oregon, Washington, Idaho, Utah, California, Colorado, New Mexico, Arizona and recently in the native range of J. nigra, in Tennessee, Pennsylvania, and Virginia. Intraspecific variability of isolates was determined using rDNA ITS partial sequences and partial beta tubulin sequences. Nested clade phylogeographic analysis was used to look for correlations between haplotype trees and geography of isolates collected in screenings for the disease. Patterns of restricted dispersal by distance were found for both markers and high variability was found in isolates from single locations. Indicating that the populations causing disease throughout the western United States are not the result of recent point introductions. G. morbida isolate and J. nigra family had inconsistent effects on canker development, while temperature had a consistent effect. At higher temperatures (32°C) canker development was reduced compared to 25°C. Several genetically different G. morbida isolates were compared and repeated differences in pathogenicity were produced.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierFreeland_colostate_0053N_10946.pdf
dc.identifierETDF2012500040BSPM
dc.identifier.urihttp://hdl.handle.net/10217/65340
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectcanker development
dc.subjectintraspecific variability
dc.subjectGeosmithia morbida
dc.subject.lcshJuglans nigra
dc.titleIntraspecific variability of Geosmithia morbida the causal agent of thousand cankers disease, and effects of temperature, isolate and host family (Juglans nigra) on canker development
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineBioagricultural Sciences and Pest Management
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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