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Filtering by: Creator Oregon State Library Remove constraint Creator: Oregon State Library Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • Fescue taxonomy in the Pacific coast states

    Creator:
    Wilson, Barbara L.
    Abstract:
    Accurate taxonomy is essential to preservation and management of native grasses. Four problems in fescue taxonomy were investigated: the identity of the native fescue that dominates western Oregon and Washington prairies, the relationship of native Festuca roemeri to closely related grasses, the status of F. howellii and F. washingtonica, and...
    Resource Type:
    Dissertation
    Full Text:
    the Pacific Coast States by Barbara L. Wilson A THESIS submitted to Oregon State University in

  • 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:
    submitted to Oregon State University in partial fulfillment of the requirements for the degree of

  • Biology and management of Meloidogyne chitwoodi using oxamyl on potato in the western United States

    Creator:
    David, Nicholas L.
    Abstract:
    Field trials were conducted during 2001 to 2003 to investigate soil population dynamics of Meloidogyne chitwoodi, tuber symptom suppression using oxamyl, and post-harvest tuber symptom development on short-season potato varieties Russet Norkotah and Russet Nugget (San Luis Valley only). The experiments were located in the San Luis Valley in Colorado,...
    Resource Type:
    Dissertation
    Full Text:
    A DISSERTATION submitted to Oregon State University in partial fulfillment of

  • A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

    Creator:
    Lint, Harold LeRoy
    Abstract:
    A study was made of the subgenus Genuini of the genus Juncus in the Pacific States, California, Oregon and Washington. Extensive morphological comparisons, geographical distributions, habitat differences and observations of apparent presence or absence of natural hybrids provided the major data sources. Cytological studies were made, but were inconclusive. Eleven...
    Resource Type:
    Dissertation
    Full Text:
    States by Harold LeRoy Lint A THESIS submitted to Oregon State University in partial fulfillment of

  • Ecological thresholds, climate extremes, and tree species' distributions across the Pacific coastal United States

    Creator:
    Lintz, Heather E.
    Abstract:
    Species' distributions across the landscape are perhaps the least understood yet most conspicuous features of life on earth. Ecologists have long studied species' distributions; yet, many questions remain about why species occur where they do. Such questions persist largely because species' distributions are complex systems with challenging properties like non-linearity,...
    Resource Type:
    Dissertation
    Full Text:
    States by Heather E. Lintz A DISSERTATION submitted to Oregon State University

  • Below ground biology of Botrychium pumicola (Ophioglossaceae)

    Creator:
    Camacho, Francisco J.
    Resource Type:
    Dissertation
    Full Text:
    Botrych;um pum;cola (Ophioglossaceae) by Francisco J. Camacho A THESIS submitted to Oregon State

  • Coniothyrium rose canker in Oregon

    Creator:
    Intrama, Siriphong
    Abstract:
    An isolate of Coniothyrium obtained from a stem canker on Nocturne rose from the Botany Department Farm, Corvallis, Oregon was studied with respect to morphological and cultural characters, pathogenicity and mineral nutrition. The hyphae of the isolate were smooth, septate and branched. The hyphal cells averaged 16.37 X 3.52 microns....
    Resource Type:
    Dissertation

  • 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:
    Douglas-fir in Coastal Oregon by Pablo H. Rosso A DISSERTATION submitted to Oregon State University

  • Dynamics of Zymoseptoria tritici Fungicide Resistance in the Willamette Valley of Oregon

    Creator:
    Hagerty, Christina H.
    Abstract:
    The development of resistance to multiple fungicide classes is currently limiting disease management options for many pathogens, while the discovery of new fungicide classes has become less frequent. To address this pressing issue, a three-part study with different layers of complexity, objectives, and experimental approaches was conducted using the model...
    Resource Type:
    Dissertation
    Full Text:
    A DISSERTATION submitted to Oregon State University in partial

  • Description of the plant communities and succession of the Oregon coast grasslands

    Creator:
    Ripley, James Douglas
    Abstract:
    In an effort to describe the plant communities and succession of the Oregon coastal grasslands, vegetation and environmental data were collected from 75 stands at 24 separate locations ranging from Cape Falcon in Tillamook County to Cape Ferrelo in Curry County. The vegetation data consisted of cover and frequency values...
    Resource Type:
    Dissertation
    Full Text:
    Oregon State University in partial fulfillment of the requirements for the degree of Doctor of