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Filtering by: Creator Frost, Kenneth Remove constraint Creator: Frost, Kenneth Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • Spatiotemporal Assessment of Crop Histories in the Pacific Northwest

    Creator:
    Kumbhakar, Ishika G.
    Abstract:
    The cultivated potato (Solanum tuberosum) is one of the most important food crops in the United States, as well as globally. As demand rises, growers in the Pacific Northwest are revisiting their crop management strategies to determine whether there are additional ways to enhance crop productivity while managing plant and...
    Resource Type:
    Masters Thesis
    Full Text:
    :______________________________________________________________ Kenneth Frost The cultivated potato (Solanum tuberosum) is one of the most

  • Diversity and Impact of Soft Rot Pathogens of Potato in the Columbia Basin

    Creator:
    Brazil, Jessie A.
    Abstract:
    Bacterial soft rot of potato (Solanum tuberosum), caused by Pectobacterium and Dickeya species, is among the most common and destructive potato diseases in the United States. These pathogens cause a variety of vascular wilts, and in potato cause a disease complex that includes tuber soft rot, blackleg, aerial stem rot,...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Kenneth Frost Bacterial soft rot of potato (Solanum tuberosum), caused by Pectobacterium

  • Scratching the Surface of the Potato Geocaulosphere: Characterizing the Microbiome of Seed Tuber Tare Soil and its Impact on the Rhizosphere Microbiome

    Creator:
    Delventhal, Kayla D.
    Abstract:
    For tuberizing crops like potato (Solanum tuberosum), the geocaulosphere, or the zone of soil in contact with and influenced by the tuber, is a distinct sphere of microbial life and represents an important interface between the potato crop and the soil environment. Upon potato harvest, specific geocaulosphere soil called tare...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________________ Kenneth Frost Posy Busby For tuberizing crops like potato (Solanum tuberosum), the

  • 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

  • Effect of iron on biological control of fire blight by Pseudomonas fluorescens A506

    Creator:
    Temple, Todd N.
    Abstract:
    Competitive exclusion has been the mechanism hypothesized to account for the biological control of fire blight disease of pear and apple by the bacterium Pseudomonas fluorescens A506 (A506). Recent laboratory assays demonstrated, however, that A506 produces an antibiotic that is toxic to the fire blight pathogen, Erwinia amylovora, when cultured...
    Resource Type:
    Masters Thesis
    Full Text:
    Control of Fire Blight by Pseudomonasfluorescens A506. Abstrard: Kenneth B. Johnson Virginia 0

  • Genomics-enabled exploration of insect toxicity in the Pseudomonas fluorescens group

    Creator:
    Rangel, Lorena I.
    Abstract:
    Pseudomonas is a diverse genus of Gamma proteobacteria that are ubiquitous in the natural environment, including soil, water, plant surfaces, and animals. The Pseudomonas fluorescens group is a diverse collection of seven subgroups and more than 50 named species. This group is known for their production of a variety of...
    Resource Type:
    Masters Thesis
    Full Text:
    frost damage of several crops and fire blight, caused by the bacterium Erwinia amylovora, of pear and

  • 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:
    committee members, Gary G. Grove, Roberto Nunez-Elisea, Kenneth B. Johnson, and Jan F. Stevens, for all 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

  • Post-dispersal seed fates in a Western Oregon native prairie

    Creator:
    Clark, Deborah L.
    Abstract:
    Knowledge of post-dispersal seed fates and other regeneration characteristics is crucial for predicting abundances and distributions of populations and, ultimately, community species composition and diversity. Seed fate studies, however, are rare primarily due to the difficulty of determining seed fates and causes of mortality. This thesis investigated post-dispersal seed fates...
    Resource Type:
    Dissertation
    Full Text:
    , Mark V. Wilson, Kenneth B. Johnson, Patricia S. Muir, Donald B. Zobel, and Jeffrey C. Miller, for

  • Understanding Host-Pathogen Interactions in the Sphaerulina musiva-Populus Pathosystem

    Creator:
    Dunnell, Kelsey Liann
    Abstract:
    Host-parasite interactions between the pathogen, Sphaerulina musiva, and its host, Populus spp., were examined in a series of studies. In the first study, variation in resistance of Populus nigra from 7 locations in Europe was differentiated based on the parameters cankers per cm and disease severity score. The analysis evaluated...
    Resource Type:
    Dissertation
    Full Text:
    my committee members at Oregon State University: Dr. Thomas Wolpert, Dr. Kenneth Johnson, Dr