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  • 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:
    Phytophthora Species and Riparian Alder Tree Damage in Western

  • 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:
    alder is not susceptible to the twelve Phytophthora species recovered from western Oregon riparian

  • 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:
    . Lithocarpus densiflorus), is established in coastal forests of the western United States. Since the

  • 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:
    Integrated Pest Management Conference. Univ. Alaska, Anchorage, AK. Coop. Ext. Serv. 112p. Lawrence, D.B

  • 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:
    dark. Germination was significantly higher on nutrient-rich V8 agar (max. 12.9 %, min. 0.2%) than

  • Port-Orford-cedar and Phytophthora lateralis : grafting and heritability of resistance in the host, and variation in the pathogen

    Creator:
    McWilliams, Michael G.
    Abstract:
    Port-Orford-cedar (Chamaecyparis lawsoniana) is a forest tree native to a small area of Oregon and California. A root disease caused by Phytophthora lateralis causes widespread mortality of Port-Orford-cedar. This dissertation examines three important elements of the Port-Orford-cedar P. lateralis pathosystem related to breeding for disease resistance: use of resistant rootstocks...
    Resource Type:
    Dissertation
    Full Text:
    grafted to western redcedar (Thuja plicata), incense cedar (Calocedrus decurrens), and Alaska yellow

  • 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:
    , Proceedings of the 5 1st Annual Western International Forest Disease Work Conference, August 18-22 2003

  • Distribution and prediction of Swiss needle cast of Douglas-fir in coastal Oregon

    Creator:
    Rosso, Pablo H.
    Abstract:
    This study was directed to improve our understanding of the ecology of Swiss needle cast (SNC) of Douglas-fir, a disease that produces extensive damage to forests and plantation in the coastal region of Oregon and Washington. A disease prediction model for the coastal area of Oregon was built by establishing...
    Resource Type:
    Dissertation
    Full Text:
    prediction surface, more suitable for testing and appropriate for assisting in disease management and

  • Epidemiology and population biology of Inonotus tomentosus as a pathogen of forests of British Columbia

    Creator:
    Lewis, Katherine JoAnn
    Abstract:
    The root disease fungus Inonotus tomentosus, common in the old growth boreal forests of British Columbia, poses a threat to the health of second growth forests established on sites with a previous history of root disease. Colonized stumps occur in groups of 1 to 6; the groups are clumped within...
    Resource Type:
    Dissertation
    Full Text:
    cutting and alternative uses has initiated a major change in emphasis from old growth management to

  • 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:
    Interior, Bureau of Land Management; U.S. Department of Agriculture, Forest Service, Pacific Northwest