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  • Comparative epidemiology of Phytophthora diseases of Rhododendron

    Creator:
    Taylor, Clare Rebecca
    Abstract:
    Rhododendron species are host to many Phytophthora species and are an important crop in the nursery industry. The foliar epidemiology of twelve Phytophthora diseases on Rhododendron was studied in field and growth chamber experiments on two Rhododendron cultivars. The relative aggressiveness of Phytophthora spp. was assessed using disease incidence, severity,...
    Resource Type:
    Masters Thesis
    Full Text:
    ., McAlonan M., Hill C. (2007) Phytophthora kernoviae in New Zealand, Fourth Meeting of IUFRO Working Party

  • 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:
    one of the most destructive pathogens of agricultural crops and forest trees, Phytophthora is a

  • 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:
    : Phytophthora Diseases of Forest Trees. 1st International IUFRO Working Party 7.02.09 Meeting. Corvallis

  • 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:
    update. Issue #4. USDA Forest Service. Milbrath, J. A. 1940. A Phytophthora disease of Chamaecyparis

  • 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:
    contains some of the most destructive pathogens of forest trees, including the most destructive pathogen

  • MARTIN_THESIS.pdf

    Creator:
    Martin, Danielle K. H.
    Abstract:
    Since around 1923 Port-Orford-cedar (Chamaecyparis lawsoniana (A. Murray) Parl.) has been affected by Phytophthora root disease caused by the virulent introduced pathogen Phytophthora lateralis. A systematic resistance testing and breeding program located at the USDA Forest Service Dorena Genetic Resource Center in Cottage Grove, Oregon was initiated in 1997 with...
    Full Text:
    the heritability of susceptibility of Port-Orford-cedar families in the Phytophthora root disease

  • The epidemiology of sudden oak death in Oregon forests

    Creator:
    Peterson, Ebba K.
    Abstract:
    The phytopathogen Phytophthora ramorum (Werres, DeCock & Man in't Veld), causal agent of Sudden Oak Death (SOD) of oaks (Quercus spp.) and tanoaks (Notholithocarpus densiflorus syn. Lithocarpus densiflorus), is established in coastal forests of the western United States. Since the discovery of SOD in the Douglas-fir / tanoak forests of...
    Resource Type:
    Dissertation
    Full Text:
    Oregon…………………………………….. 3 Dispersal of forest Phytophthora spp…………………………….......... 9 Concluding

  • Phytophthora ramorum within an Oregon tanoak forest : quantifying inoculum within canopy throughfall vs. soil splash

    Creator:
    Benemann, Silvia, E.
    Abstract:
    Phytophthora ramorum continues to cause extensive mortality of tanoaks in southwestern Oregon. Rain readily washes inoculum down through the canopy, causing new infections on the lower parts of the tree and neighboring host plants. Although this aspect of dispersal is well understood, the relative importance of infested soil and leaf...
    Resource Type:
    Masters Thesis
    Full Text:
    IUFRO Working Party 7.02.09 Meeting, Freising, Germany 11th –17th September 2004. Forest Research

  • The Phytophthora species assemblage and diversity in riparian alder ecosystems of western Oregon, USA

    Creator:
    Sims, Laura Lee, Sutton, Wendy, Reeser, Paul, and Hansen, Everett M.
    Abstract:
    Phytophthora species were systematically sampled, isolated, identified and compared for presence in streams, soil and roots of alder (Alnus species) dominated riparian ecosystems in western Oregon. We describe the species assemblage and evaluate Phytophthora diversity associated with alder. We recovered 1250 isolates of 20 Phytophthora species. Only three species were...
    Resource Type:
    Article
    Full Text:
    . Phytophthora species rank prominently in lists of threats to forest tree health (Hansen 2007). Examples include

  • Phytosanitation of Douglas-fir (Pseudotsuga menziesii) logs to mitigate the risk of artificially disseminating Phytophthora ramorum within the global trade of timber

    Creator:
    Hulbert, Joseph M.
    Abstract:
    Phytophthora ramorum is a plant pathogen that was accidentally introduced to the United States. This invasive microorganism has killed over a million trees in California and Oregon, and continues to spread to new areas. Diseased areas have been nationally quarantined to prevent further spread and more than ninety countries include...
    Resource Type:
    Masters Thesis
    Full Text:
    by forest diseases annually (FAO, 2009). This statistic is expected to climb because of increasing