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Filtering by: Creator Shearer, Gilbert Marshall Remove constraint Creator: Shearer, Gilbert Marshall Advisor Mundt, Christopher C. Remove constraint Advisor: Mundt, Christopher C.

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  • Pathogenic variability and adaptation of Septoria tritici to different wheat cultivars

    Creator:
    Ahmed, Hafiz Uddin
    Abstract:
    Experiments were done to determine pathogenic variability and pathogenic adaptation of Septoria tritici to different wheat cultivars. Fifteen S. tritici isolates from California, Oregon, and Texas were evaluated on seedlings of two sets of geographically diverse wheat cultivars under greenhouse conditions. Significant isolate effects, cultivar effects, and isolate X cultivar...
    Resource Type:
    Dissertation
    Full Text:
    & Marshall, 1990). The most important objective of plant breeders and plant pathologists is to develop

  • Effect of wheat cultivar mixtures on populations of Puccinia striiformis races

    Creator:
    DiLeone, Julie A.
    Abstract:
    This study quantified the frequency of simple versus complex races of Puccinia striiformis Westend. in mixtures of wheat cultivars possessing different race-specific resistance genes. A simple race of a pathogen can infect only one component, and a complex race of the pathogen can infect two or more components of an...
    Resource Type:
    Masters Thesis
    Full Text:
    , and for always coming home. To my parents, Gilbert and Rosemary, I owe the deepest thank you. They

  • Effects of host resistance on Mycosphaerella graminicola populations

    Creator:
    Cowger, Christina
    Abstract:
    Mycosphaerella graminicola (anamorph Septoria tritici) causes Septoria tritici blotch, a globally important disease of winter wheat. Resistance and pathogenicity generally vary quantitatively. The pathogen reproduces both sexually and asexually, and the pathogen population is highly genetically variable. Several unresolved questions about the epidemiology of this pathosystem are addressed by this...
    Resource Type:
    Dissertation

  • Ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae)

    Creator:
    Campanella, Donald M.
    Abstract:
    A study consisting of three parts was undertaken to investigate how variation in species interactions, population genetic structure, epidemiological parameters, and plant breeding system may influence the ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae). Interactions between natural enemy species may modify their net effect on...
    Resource Type:
    Dissertation
    Full Text:
    and Marshall, 1981). Asexuality may act to retain successful genotypes following founder effects in

  • Effects of single and multiple stressors on communities of wheat and wild oats

    Creator:
    Pfleeger, Thomas G.
    Abstract:
    Most plant toxicology tests developed in support of environmental laws use a single stress applied to an individual plant. While tests using individual species or stresses require fewer resources and are easier to interpret, they are under increasing criticism for being unrealistic and missing important ecological interactions. The objective of...
    Resource Type:
    Dissertation