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Filtering by: Alternative title ssim Agriculture monograph no. 13 Remove constraint Alternative title ssim: Agriculture monograph no. 13 Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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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:
    and Plant Pathology presented on February 13, 2014. Title: Phytophthora Species and Riparian Alder

  • Biology of sweet cherry powdery mildew

    Creator:
    Calabro, Jill M.
    Abstract:
    The Pacific Northwest has become one of the nation’s premier sweet cherry, Prunus avium, production areas. As production of sweet cherries has flourished in Oregon and Washington, so has powdery mildew, caused by the fungus Podosphaera clandestina, which infects both foliage and fruit causing severe economic damage to growers. Sweet...
    Resource Type:
    Dissertation
    Full Text:
    presented on April 13, 2007. Title: Biology of Sweet Cherry Powdery Mildew Abstract approved

  • Conservation of Sidalcea nelsoniana through habitat management : effects of burning, mowing, and altered flooding regime on a rare Willamette Valley perennial

    Creator:
    Bartels, Marilynn R.
    Abstract:
    Active habitat management plays a key role in the preservation of native ecosystems and rare species, especially in the Willamette Valley of Oregon, where natural succession to woodlands threatens the few wetland prairies remaining after 150 years of agriculture and urbanization. Sidalcea nelsoniana, listed as threatened under the federal Endangered...
    Resource Type:
    Masters Thesis
    Full Text:
    of Master of Science in Botany and Plant Pathology presented on March 13, 2000. Title: Conservation

  • Effects of intercropping beans with maize on angular leaf spot and rust of beans

    Creator:
    Boudreau, Mark Alan, 1958-
    Abstract:
    Experiments were performed to determine the nature of maize influence on bean disease in additive-type intercrops. Overall effects of intercrops on angular leaf spot (caused by Phaeoisariopsis griseola) in Kenya indicated >23% reductions (P<0.05) in area under the disease progress curve (AUDPC) in two of three season-site combinations. Fertilization tended...
    Resource Type:
    Dissertation
    Full Text:
    Philosophy in Botany and Plant Pathology presented on September 13, 1991. Title: Effects of Intercropping

  • 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:
    and Plant Pathology presented on Friday, May 13 2011 . Title: Evaluation of Kasugamycin

  • Symbiosis in the Pacific Ring of Fire : evolutionary-biology of Rhizopogon subgenus Villosuli as mutualists of Pseudotsuga

    Creator:
    Mujic, Alija Bajro
    Abstract:
    Rhizopogon is a large genus of ectomycorrhizal (EM) fungi that grows in association with host trees of the family Pinaceae. We have conducted a series of studies investigating the ecology and evolutionary biology of the EM symbiosis shared between R. subgenus Villosuli and trees of the genus Pseudotsuga. Two members...
    Resource Type:
    Dissertation
    Full Text:
    Plant Pathology presented on March 13, 2015 Title: Symbiosis in the Pacific Ring of Fire

  • The role of Verticillium albo-atrum Reinke and Berth in seed transmission and induction of a latent disease of Pelargonium

    Creator:
    Koocheki, Hormozdyar Khodadad
    Abstract:
    Many initially healthy Pelargonium seedlings developed symptoms of Verticillium wilt in an Oregon State University greenhouse when they attained blooming age. The symptoms first appeared in May as "edge burning," yellowing, and wilting of leaves. In late summer, these seedlings which were the offspring of Verticillium infected plants, became severely...
    Resource Type:
    Masters Thesis
    Full Text:
    Pathology Dean of Graduate School Date thesis is presented April 13, 1964 Typed by Betty Hostetter

  • Fungitoxicity of silver salts

    Creator:
    Guilford, Roger Kirby
    Abstract:
    The demand for new fungicides to control plant diseases has led to experimentation with both previously used and newly developed fungicides. Silver, an older but little used fungicide, was selected for evaluation because of its high toxicity to microorganisms. Silver nitrate and a silver electrolytic cell were tested as potential...
    Resource Type:
    Masters Thesis
    Full Text:
    presented May 13, 1963 Title FUNGITOXICITY OF SILVER SALTS Abstract approved (Major Professor) The

  • Mediation of conifer root growth by mycorrhizal fungi and plant growth regulators

    Creator:
    Scagel, Carolyn F.
    Abstract:
    Many mycorrhizosphere microorganisms can produce plant growth regulating compounds in vitro. Plant growth regulating compounds are known to mediate root growth and development. In reforestation practices, conifer tree seedling growth and survival are linked to rapid root growth and development after outplanting. Multifactorial experiments were conducted to document variations in...
    Resource Type:
    Dissertation
    Full Text:
    Philosophy in Botany and Plant Pathology presented December 13, 1993. Title: Mediation of Conifer Root

  • Sweet corn decline syndrome in Oregon's Willamette Valley

    Creator:
    Hoinacki, Elisabeth V.
    Abstract:
    For the past several years vegetable growers in Oregon's Willamette Valley have experienced reduced yields in their sweet corn plantings. We conducted studies to 1) describe the symptomology and etiology of the disease, 2) test a root rot rating system we developed to evaluate factors in the disease syndrome, and...
    Resource Type:
    Dissertation
    Full Text:
    . Atrazine, metolachior + benoxacor and benoxacor alone generally had no effect on plant dry weight or root