Search Constraints

Start Over
Filtering by: Creator VanderKooi, Scott P. Remove constraint Creator: VanderKooi, Scott P. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Advisor Mundt, Christopher C. Remove constraint Advisor: Mundt, Christopher C.

Search Results

  • 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:
    : Plant Disease Epidemiology. P. R. Scott and A. W. Bainbridge, eds. Blackwell Scientific Pub., Oxford. 4

  • 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:
    stand of winter wheat were inoculated with three races of P. striiformis (CDL 27, CDL 29, and CDL 41

  • 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:
    investigate natural associations in the distribution of damage caused by P. chondrillina, E. chondrillae

  • 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:
    any and Plant P logy Dean of Gradualte Scho Date thesis is presented November 1, 1993 Thesis

  • Interrelationship of wheat cultivar mixtures, stripe rust and yield

    Creator:
    Akanda, Shamsul I.
    Resource Type:
    Dissertation
    Full Text:
    variety mixtures. In Plant Disease Epidemiology, eds P. R. Scott and A. Bainbridge, pages 129-137

  • Interactive effects of stripe rust and plant competition in heterogeneous wheat populations

    Creator:
    Finckh, Maria Renate
    Abstract:
    Disease has been implied as an important selective force acting in plant populations. This study was conducted to determine the effects of stripe rust (Puccinia striiformis) on the population dynamics of wheat (Triticum aestivum) cultivar mixtures. Five wheat cultivars were grown in pure stands and all possible mixtures at three...
    Resource Type:
    Dissertation
    Full Text:
    from plotting logits of the frequencies (2), (ln[p/(1-p)] versus the number of generations for data

  • 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
    Full Text:
    . Jlibene, M., Gustafson, J. P., and Rajaram, S. 1994. Inheritance of resistance to Mycosphaerella

  • 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
    Full Text:
    111-4. The P-values testing for the significance of components from linear and nonlinear regression

  • 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:
    Microsoft Word - Scott Liu Thesis V2 SL.docx

  • Factors influencing the effects of host diversity on plant disease epidemics for wheat stripe rust and potato late blight

    Creator:
    Garrett, Karen A.
    Abstract:
    Most studies of plant disease epidemiology have focused on epidemics in host populations composed of a single genotype. But crop plant diversity can be a useful means of improving the deployment of resistance genes. In a series of experiments with wheat stripe rust and potato late blight, we studied factors...
    Resource Type:
    Dissertation
    Full Text:
    Scott Robbins for management of the field plots at Corvallis. * Thanks to Candelaria and Jesus