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Filtering by: Subject Conifers -- Diseases and pests Remove constraint Subject: Conifers -- Diseases and pests Committee Member Johnson, Ken Remove constraint Committee Member: Johnson, Ken Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • Studies on the etiology and epidemiology of bull's eye rot of pears

    Creator:
    Henriquez, Jose Luis, 1961-
    Abstract:
    The objective of this dissertation is to introduce low-cost processing methods for the fabrication of ZnO transparent thin-film transistors (TTFTs). A novel method for depositing ZnO body layers via spin-coating of a zinc nitrate-based spin solution is presented. The processing conditions of spin-coated ZnO are optimized to produce continuous and...
    Resource Type:
    Dissertation
    Full Text:
    , where the highest levels of disease were found at 10°C and at 30°C, respectively. Wetness duration did

  • 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:
    ), pest control, efficient use of nutrients, and, of interest to us here, disease control (14). One must

  • Histological comparisons of needle tissues of four species of white pine infected by Cronartium ribicola

    Creator:
    Sweeney, Katarina
    Abstract:
    Hypersensitive response-like (HR-like) needle reactions to infection by the white pine blister rust pathogen, Cronartium ribicola, have been reported for several species of five needle pines native to western North America. The best-studied examples are in Pinus monticola and P. lambertiana. In these species a "needle spot" phenotype has been...
    Resource Type:
    Masters Thesis
    Full Text:
    . flexilis, P. strobiformis, P.aristata, P. longaeva, and P. balfouriana. The pathogen and the disease is

  • 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:
    populations that reduce disease severity. In the center of coevolution for the rusts and small grains

  • 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:
    disease of winter wheat. Resistance and pathogenicity generally vary quantitatively. The pathogen