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Morphological variation, taxonomy, and host specificity of Phytophthora megasperma

Creator:: Hamm, Philip B.
Resource Type:: Masters Thesis
Full Text:: Phytophthora Megasperm AN ABSTRACT OF THE THESIS OF Philip B. Hamm for the degree of Master of Science in

Susceptibility of Pacific yew (Taxus brevifolia Nutt.) to Phytophthora lateralis

Creator:: Murray, Marion S.
Abstract:: In 1991 Pacific yew (Taxus brevifolia Nutt.) was reported as a new host for Phytophthora lateralis Tucker and Milbrath which is an aggressive root rot pathogen thought previously to be specific to Port-Orford-cedar. This study was designed to compare the pathogenicity of P. lateralis on the two hosts, and to...
Resource Type:: Masters Thesis
Full Text:: Phytophthora lateralis AN ABSTRACT OF THE THESIS OF Marion S. Murray for the degree of Master of Science

Pathogenicity of Phytophthora species from Oregon waterways

Creator:: Navarro, Sarah M.
Abstract:: Described as one of the most destructive pathogens of agricultural crops and forest trees, Phytophthora is a genus of microorganisms containing over 100 known species. Phytophthora alni has caused collar and root disease in alders throughout Europe and a form of the species has recently been isolated in North America....
Resource Type:: Masters Thesis
Full Text:: h y g y n o u s p a ra g y n o u s h y p h a l sw e ll in g s ch la m y d o

Phytophthora species and riparian alder tree damage in western Oregon

Creator:: Sims, Laura L.
Abstract:: The genus Phytophthora contains some of the most destructive pathogens of forest trees, including the most destructive pathogen of alder in recent times, Phytophthora alni. Alder trees were reported to be suffering from canopy dieback in riparian ecosystems in western Oregon, which prompted a survey of alder health and monitoring...
Resource Type:: Dissertation
Full Text:: to stay in their home, twice. I sincerely thank Ellen Goheen and her U. S. Forest Service crew

Castilleja and Pedicularis are confirmed as telial hosts for white pine blister rust in whitebark pine ecosystems of Oregon and Washington

Creator:: Mulvey, Robin L.
Abstract:: The primary objective of this research was to determine if native species within the genera Castilleja and Pedicularis are naturally infected by white pine blister rust (Cronartium ribicola) in whitebark pine ecosystems of the Oregon and Washington Cascade Range. Secondary objectives were to monitor the phenology of aecial and telial...
Resource Type:: Masters Thesis
Full Text:: herbaceous plots ………………………… 116 Appendix B. Cronartium ribicola-infected specimens from

Pathological and ecological aspects of decline and mortality of Chamaecyparis nootkatensis in southeast Alaska

Creator:: Hennon, Paul Edward
Abstract:: Alaska-cedar (Chamaecvparis nootkatensIs (D. Don) Spach) is a valuable tree that is suffering from a serious decline and mortality of unknown cause throughout southeast Alaska. Epidemiological and pathological studies were initiated to determine if a pathogen is the primary cause of this problem. By examining old aerial photographs and by...
Resource Type:: Dissertation
Full Text:: not responsible for Alaska-cedar decline and that sane abiotic factor(s) is a more likely cause

Resistance mechanisms of Port-Orford-cedar to Phytophthora lateralis

Creator:: Oh, Eunsung
Abstract:: Breeding Port-Orford-cedar for resistance to Phytophthora lateralis, a causal agent of root disease, begins by screening, through artificial inoculation, phenotypically resistant trees selected from natural stands. The successful program selected tolerant or resistant POC parent trees for the purpose of disease management. Candidate resistant POCs were used in my dissertation...
Resource Type:: Dissertation
Full Text:: root dip (B) inoculation with zoospores of P. lateralis and incubation for 4 weeks

Biology of chlamydospores of Phytophthora ramorum

Creator:: Smith, Aaron Lee
Abstract:: The chlamydospore is a survival spore produced by 35 of the 75 described species of Phytophthora. Phytophthora ramorum Werres, de Cock & Man in't Veld, the causal agent of Sudden Oak Death (SOD), produces abundant chlamydospores in artificial culture and plant tissue. The chlamydospore is likely the most important survival...
Resource Type:: Masters Thesis
Full Text:: )...................................… 52 Chlamydospore Germination on V8 and WA (Germination Experiment B)…………..……………. 53 Wall

Trichoderma spp. : distribution in stumps infested with Phellinus weirii and growth and antagonism in vitro

Creator:: Goldfarb, Barry
Abstract:: To determine which isolates will most rapidly replace Phellinus weirii in stumps and roots, Trichoderma spp. were isolated from P. weirii-infested stumps and roots, identified, and examined for growth rates and lethal effects on P. weirii in vitro. Phellinus weirii-infested Douglas-fir stumps and stump roots were sampled for microorganisms by...
Resource Type:: Masters Thesis
Full Text:: species of Trichoderma (Dennis and Webster, 1971a and b). Variation in the antagonistic abilities of

Susceptibility of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

Creator:: Saavedra, Angel Luis
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...
Resource Type:: Masters Thesis
Full Text:: and downs; Susan, Dave, Nate, Heather, John B., thank you. My mother Corina, my father and all my

ScholarsArchive@OSU

Morphological variation, taxonomy, and host specificity of Phytophthora megasperma

Susceptibility of Pacific yew (Taxus brevifolia Nutt.) to Phytophthora lateralis

Pathogenicity of Phytophthora species from Oregon waterways

Phytophthora species and riparian alder tree damage in western Oregon

Castilleja and Pedicularis are confirmed as telial hosts for white pine blister rust in whitebark pine ecosystems of Oregon and Washington

Pathological and ecological aspects of decline and mortality of Chamaecyparis nootkatensis in southeast Alaska

Resistance mechanisms of Port-Orford-cedar to Phytophthora lateralis

Biology of chlamydospores of Phytophthora ramorum

Trichoderma spp. : distribution in stumps infested with Phellinus weirii and growth and antagonism in vitro

Susceptibility of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

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