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Filtering by: Creator Short, Andrew D. Remove constraint Creator: Short, Andrew D. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Advisor Hansen, Everett M. Remove constraint Advisor: Hansen, Everett M.

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  • 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:
    nootkatepsIs (D. Don) Spach) is a valuable tree that is suffering from a serious decline and mortality of

  • 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:
    (Germination Experiment D)………...……………… 53 Chlamydospore Germination and Age of Culture (Germination

  • 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:
    ., Goheen, D. J., Mastrofini, K., Rose, D. L., and White, D. E. (Editors). 2003. A range-wide assessment of

  • Incompatibility reactions and nuclear condition of three Phellinus species

    Creator:
    Hennon, Paul E.
    Abstract:
    Phellinus arctostaphyli (Long) Niemela, P. igniarius (L. ex Fr.) Quel., and P. tremulae (Bond.) Bond. et Boriss., heartrotting hymenomycetes in the family Hymenochaetaceae (Aphyllophorales), all conform to a multi-allelic heterothallic mating system. Both compatible and incompatible reactions result from pairings of homokaryons from the same basidiocarp. Homokaryons isolated from different...
    Resource Type:
    Masters Thesis
    Full Text:
    the basidiocarp; woody context from thick-walled skeletal hyphae; short setae and no setal hyphae in

  • 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:
    26: 245 - 258. Betlejewki, F., Casavan, K., Dawson, A., Goheen, D., Mastrofini, K., Rose, D. and

  • Pathogenesis and intertree transmission of Verticicladiella wageneri in Douglas-fir (Pseudotsuga menziesii)

    Creator:
    Hessburg, Paul F.
    Abstract:
    Verticicladiella wageneri Kendr. is a vascular wilt pathogen of Douglas-fir in the Pacific Northwest, The disease is characterized by black staining of colonized sapwood; crown symptoms are those typical of a wilting syndrome. Histopathological studies revealed that the pathogen is limited to the xylem but causes vascular dysfunction in both...
    Resource Type:
    Dissertation
    Full Text:
    was veri- fi d from field excavations in natural infection centers In potted seedling experiments

  • The infection and colonization of Douglas-fir needles by the Swiss needle cast pathogen, Phaeocryptopus gaeumannii (Rhode) Petrak

    Creator:
    Capitano, Bryan R.
    Abstract:
    Phaeocryptopus gaeumannii is a pathogenic fungus on Douglas-fir needles which has become a serious threat to timber production in the last decade along the Oregon coast This research was undertaken to describe the general biology and pathology of F. gaeumannii on Douglas-fir needles and how environmental variables affect fungal development....
    Resource Type:
    Masters Thesis
    Full Text:
    various pines, also penetrates through the stoma. Several workers have observed that germ tubes from D

  • Phylogenetics, population genetics, molecular epidemiology, and pathogenicity of the Douglas-fir Swiss needle cast pathogen Phaeocryptopus gaeumannii

    Creator:
    Winton, Loretta M.
    Abstract:
    A hierarchical series of studies, based mainly on molecular data, was conducted to elucidate the life history of the Douglas-fir Swiss needle cast pathogen Phaeocryptopus gaeumannii at macro- and micro-evolutionary scales. This information was then utilized to design and evaluate molecular diagnostic tools for use in studies on the epidemiology...
    Resource Type:
    Dissertation
    Full Text:
    ). Scattered, short-lived occurrences of disease in Pacific Northwest forests began in the 1980's and were

  • 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:
    ………………............................................................... 112 Appendix C. Culture identification of Phytophthora spp. ………………......... 116 Appendix D

  • 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:
    pathosystem, considering that C. ribicola reproduces sexually and has a very short generation time compared