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Filtering by: Creator Washington, Betsy B. Remove constraint Creator: Washington, Betsy B. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology

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  • Responses of forest understory plants to burial by volcanic tephra from Mount St. Helens, Washington

    Creator:
    Antos, Joseph A.
    Abstract:
    The effects of burial by tephra (volcanic aerial ejecta) on forest understory plants were examined northeast of Mount St. Helens, Washington, in the area where the 18 May 1980 eruption deposited tephra but did not destroy canopy trees. At six sites along a tephra depth gradient from 2-15 cm, understory...
    Resource Type:
    Dissertation
    Full Text:
    volcanic tephra from Mount St. Helens, Washington AN ABSTRACT OF THE THESIS OF Joseph A. Antos for the

  • Influence of a sudangrass green manure on microorganisms and early dying of potatoes in two soils

    Creator:
    Parks, Robin L.
    Abstract:
    Effect of a sudangrass green manure in two soil types on the activity, populations and community structure of soil microorganisms, populations of Verticillium dahliae in soil and on potato roots, and potato early dying, were evaluated in a field microplot experiment in the Columbia Basin. Potato cv. Russet Burbank was...
    Resource Type:
    Masters Thesis
    Full Text:
    Washington where sudangrass previously suppressed or enhanced early dying of potatoes, respectively

  • The detection of ilarvirus (subgroup B) by enzyme-linked immunosorbent assay

    Creator:
    McMorran, Jeffrey P.
    Abstract:
    The reliability and sensitivity of enzyme-linked immunosorbent assay (ELISA) in the detection of ilarvirus (isometric labile ringspot virus) subgroup B and prune dwarf virus (PDV) isolates in Prunus and Malus species has been well established. To use this technique in large scale virus indexing programs more information was required on...
    Resource Type:
    Masters Thesis
    Full Text:
    The detection of ilarvirus (subgroup B) by enzyme-linked

  • Genetic variability in the eastern filbert blight pathosystem

    Creator:
    Osterbauer, Nancy K.
    Abstract:
    The heritability of resistance to eastern filbert blight, caused by Anisogramma anomala, in European hazelnut (Corylus avellana) was evaluated in the progeny of seven cultivars crossed in 12 combinations. Progeny produced by crossing 'VR6-28' with three susceptible cultivars segregated 1:1 for complete resistance to eastern filbert blight. Histograms of disease...
    Resource Type:
    Dissertation
    Full Text:
    , Oregon, and Washington 109 B.1. Histograms showing the frequency distribution for number of

  • Ecology of Corydalis aquae-gelidae, a rare riparian plant

    Creator:
    Goldenberg, Douglas M.
    Abstract:
    Corydalis aquae-gelidae is a large herbaceous perennial in the Fumariaceae that has high habitat specificity. It is endemic to the western Cascade Range of Oregon and Washington, almost entirely on the Mt. Hood and Gifford Pinchot National Forests. It is a federal C2 candidate under the Endangered Species Act and...
    Resource Type:
    Masters Thesis
    Full Text:
    Riparian Plant. Abstract approved: Donald B obel Corydalis aquae-gelidae is a large herbaceous perennial

  • 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:
    identity of the native fescue that dominates western Oregon and Washington prairies, the relationship of

  • The relation of soil characteristics to growth and distribution of Chamaecyparis lawsoniana and Thuja plicata in southwestern Oregon

    Creator:
    Imper, David Kimberly
    Abstract:
    Twelve plots at six sites in southwestern Oregon were studied to determine the degree to which various soil characteristics are related to the occurrence and growth of Chamaecyparis lawsoniana and Thuja plicata. Soil profiles and vegetation were described in each plot, and measurements were made of insolation, soil and litter...
    Resource Type:
    Masters Thesis
    Full Text:
    lkoLltcT B. Zobel Twelve plots at six sites in southwestern Oregon were studied to determine the degree

  • Evaluation of kasugamycin-use strategies designed to delay development of resistance in Erwinia amylovora

    Creator:
    Hubbard, Andrew Robert
    Abstract:
    The antibiotics, streptomycin sulfate and oxytetracycline, are used widely for fire blight suppression in the Pacific Northwest region of the United States. The efficacy of streptomycin, however, is compromised by widespread streptomycin-resistance in E. amylovora populations, and oxytetracycline is only partially effective. Consequently, for several years, the aminoglycoside antibiotic, kasugamycin...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: ______________________________________________________ Kenneth B. Johnson The

  • Epiphytic yeasts isolated from apple leaves to control of gray and blue mold fruit rots of apple

    Creator:
    Falconi, Cesar E.
    Abstract:
    Eight phylloplane yeasts were isolated from backyard apple trees in Corvallis, OR. Yeast isolates were classified to genus or species level. All isolates were tested in vitro for antagonistic activity against the postharvest pathogens Botrytis cinerea and Penicillium expansum. Of these isolates, Aureobasidium pullulans, Sporobolomyces roseus Rhodotorula sp., consistently reduced...
    Resource Type:
    Masters Thesis
    Full Text:
    , Aureobasidium pullulans, Sporobolomyces roseus Rhodotorula sp., consistently reduced mycelial growth of B

  • Comparison of the water relations characteristics of woody plants in western Oregon

    Creator:
    Davis, Kent J.
    Abstract:
    I studied the water relations traits, twig conductivity, C'3 isotopic composition, and wood density of three conifer and five angiosperm species in western Oregon. This study took place from spring 2002 to fall 2003 on four sites. Species were selected to represent the diversity of drought tolerance of woody plants...
    Resource Type:
    Masters Thesis
    Full Text:
    , 2005. Major Professor, representing B Plant Pathology Chair of the Department of Botany ñd Plant