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Susceptiblity of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

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dc.contributor.advisor Hansen, Everett M.
dc.creator Saavedra, Angel Luis
dc.date.accessioned 2011-08-12T17:54:38Z
dc.date.available 2011-08-12T17:54:38Z
dc.date.copyright 2006-03-29
dc.date.issued 2006-03-29
dc.identifier.uri http://hdl.handle.net/1957/22566
dc.description Graduation date: 2006 en_US
dc.description.abstract In early 2000, unusual mortality of a native North American tree, golden chinquapin, was reported by the USDA-Forest Service. Dying trees exhibited girdling cankers in the inner bark of the lower bole, branch flagging and defoliation. Isolations from necrotic tissues and soil associated with diseased or killed trees yielded Phytophthora cambivora, a pathogen that is known to infect and kill chestnut species in Europe and in the United States. Morphological, physiological and molecular testing confirmed the identity of isolates recovered as P. cambivora. Pairing tests showed that both mating types, A1 and A2, of this species were present in forest soil in Oregon. Pathogenicity tests were conducted to confirm the susceptibility of golden chinquapin to P. cambivora. Two inoculation trials were conducted: 1) Trees were wound inoculated with mycelial plugs of P. cambivora; after 35 days necrotic tissues were formed in the inner bark of all the inoculated trees, as seen in natural infections. 2) Seedlings were inoculated with a zoospore suspension of P. cambivora; after 38 days all inoculated seedlings were killed, the roots were rotted and the inner bark of lower stems was necrotic. Phytophthora cambivora was re-isolated from necrotic tissues in both trials, completing Koch's postulates. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Fagaceae -- Diseases and pests -- Oregon en_US
dc.subject.lcsh Phytophthora cambivora -- Oregon en_US
dc.title Susceptiblity of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Botany and Plant Pathology en_US
dc.degree.level Master's en_US
dc.degree.discipline Science en_US
dc.degree.grantor Oregon State University en_US
dc.description.digitization File scanned at 300 ppi (Monochrome, 256 Grayscale, 24-bit Color) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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