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Filtering by: Creator Sneed, S. B. Remove constraint Creator: Sneed, S. B. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Committee Member Johnson, Kenneth B. Remove constraint Committee Member: Johnson, Kenneth B.

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  • 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

  • Host and Pathogen Genetics in the Sharp Eyespot Disease of Wheat

    Creator:
    Liu, Jiang
    Abstract:
    Wheat sharp eyespot (SES), caused by the soil-borne fungus Rhizoctonia cerealis is a common stem disease of wheat globally. The disease caused a severe and extensive epidemic throughout the Willamette Valley of Oregon in 2014 and has remained one of the most important wheat diseases in this region. However, litte...
    Resource Type:
    Dissertation
    Full Text:
    PCR. Journal of General Plant Pathology 78, 247-54. Gutiérrez-Moya E, Adenso-Díaz B, Lozano S, 2021

  • Pyrenophora tritici-repentis : investigation of factors that contribute to pathogenicity

    Creator:
    Holman, Thomas W.
    Abstract:
    Pyrenophora tritici-repentis (Ptr) is the necrotrophic fungus responsible for tan spot of wheat (Triticum aestivum). Ptr causes disease on susceptible wheat cultivars through the production and secretion of host-selective toxins (HSTs). HSTs are compounds that are only known to be produced by fungi and considered to be primary determinants of...
    Resource Type:
    Masters Thesis
    Full Text:
    ), and the R-gene mediator, Sgt1. Ptr exhibits a complex race structure determined by the HST(s

  • 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:
    se b a ct er ia l g en er a . In P . lu m in es ce n s W 1 4 , T c g en es a

  • 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:
    ., Rossmann, S., Perminow, J., and Brurberg, M. B. 2017. Pectobacterium polaris sp. nov., isolated from

  • Susceptibility of coast redwood seedlings to Phytophthora ramorum

    Creator:
    Lucas, Sunny L.
    Abstract:
    Coast redwood (Sequoia sempervirens) (D. Don) Endl. is a host for Phytophthora ramorum but it was unclear if the pathogen represents a significant disease risk to this tree species. In this study the susceptibility of coast redwood seedlings and the likelihood of sporulation on redwood were examined. Two methods were...
    Resource Type:
    Masters Thesis
    Full Text:
    been designated as hosts or associated hosts (U. S. Department of Agriculture 2008). Koch’s

  • Pathogenicity of Phytophthora species from Oregon waterways

    Creator:
    Navarro, Sarah M.
    Abstract:
    Described as one of the most destructive pathogens of agricultural crops and forest trees, Phytophthora is a genus of microorganisms containing over 100 known species. Phytophthora alni has caused collar and root disease in alders throughout Europe and a form of the species has recently been isolated in North America....
    Resource Type:
    Masters Thesis
    Full Text:
    h y g y n o u s p a ra g y n o u s h y p h a l sw e ll in g s ch la m y d o

  • Ascospore viability and dispersal from pruned branches infected with Anisogramma anomala

    Creator:
    Heckert, Stephanie
    Abstract:
    Viability and dispersal of ascospores of Anisogramma anomala, the cause of eastern filbert blight (EFB) on European hazelnut, from diseased branches pruned from trees were measured. In each of two years, branches bearing stromata of A. anomala were cut in mid-December and compared to branches cut near budbreak in March,...
    Resource Type:
    Masters Thesis
    Full Text:
    … 58 Appendix B Additional Spore Traps and Nursery Trees North of Source

  • 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:
    ., Beauseigle, S., Dhillon, B., Ojeda, D. I., Bilodeau, G., Isabel, N., Gros-Louis, M. C., Kope, H., Zeglen, S

  • Interrelationship of wheat cultivar mixtures, stripe rust and yield

    Creator:
    Akanda, Shamsul I.
    Resource Type:
    Dissertation
    Full Text:
    support and encouragement. Sincere appreciation is also extended to S. A. Miah and A. K. M