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  • Environmental Factors Affecting Phytophthora Root Rot of Rhododendron

    Creator:
    Mestas, Angie
    Abstract:
    Phytophthora root rot decreases availability and quality of rhododendrons produced in the USA. Symptoms of Phytophthora root rot include root necrosis, leaf chlorosis, stunting, and permanent wilt. The purpose of this thesis was to better understand the impact of root damage, soil moisture, nitrogen fertilizer application, and pathogen species on...
    Resource Type:
    Masters Thesis
    Full Text:
    . Title: Environmental Factors Affecting Phytophthora Root Rot of Rhododendron. Abstract

  • Genetic resistance to white mold (Sclerotinia sclerotiorum (Lib.) De Bary) in scarlet runner beans (Phaseolus coccineus L.)

    Creator:
    Gilmore, Barbara S.
    Abstract:
    White mold, caused by Sclerotinia sclerotiorum (Lib.) De Bary, is a destructive yield-limiting disease of common bean (Phaseolus vulgaris L.). Genetic resistance to this pathogen is limited in common bean. Identification of high levels of partial physiological resistance in a genetically cross compatible species, Phaseolus coccineus, is advisable. The objectives...
    Resource Type:
    Dissertation
    Full Text:
    6 1970) or fusarium root rot resistance (Hassan et al. 1971)]. Resistance to S. sclerotiorum in

  • Grape Powdery Mildew Management: The Interaction Between Inflorescence Stage and Fungicide Chemistry

    Creator:
    Warneke, Brent W.
    Abstract:
    Grape powdery mildew (GPM, causal agent Erysiphe necator) is the most economically important disease of grapevine in the Western U.S. Low levels of GPM infection on clusters (1-5%) can negatively affect wine sensory quality, so intensive fungicide programs are common. This may lead to problems like excessive fungicide use and...
    Resource Type:
    Masters Thesis
    Full Text:
    products. Many fungicides effectively control GPM cluster infections, but optimal timing regimes for

  • Breeding and genetics of lilacs and hardy hibiscus

    Creator:
    Lattier, Jason D.
    Abstract:
    Lilacs are a group of ornamental trees and shrubs in the Oleaceae family consisting of 22 to 30 species. There are six series within genus Syringa: Pubescentes, Villosae, Ligustrae, Ligustrina, Pinnatifoliae, and Syringa. Fertility and cross-compatibility among cultivars, species, and series have yet to be formally investigated. Over three years,...
    Resource Type:
    Dissertation
    Full Text:
    , Pubescentes, and Villosae. We report the success of each of these combinations and the fertility

  • Breeding qualitative and quantitative traits for potatoes in the Columbia Basin

    Creator:
    Graebner, Ryan C.
    Abstract:
    The cultivated potato (Solanum tuberosum L.) is one of the world’s most important staple crops, ranked fourth after maize, rice, and wheat. While the potato’s success is due largely to its high yield, it also benefits from its broad global acceptance, and its ability to be used by the consumer...
    Resource Type:
    Dissertation
    Full Text:
    Progress of germplasm improvement efforts in temperate growing regions .... 4 1.4 Clean introgression of

  • Investigation of hop downy mildew through association mapping and observations of the oospore

    Creator:
    Parker, Thomas B.
    Abstract:
    Hop downy mildew is a devastating disease affecting hop requiring expensive fungicide applications throughout the growing season. Plant resistance is highly desirable and theorized as being decidedly quantitative with dominance and epistasis involved in resistance. An association mapping approach using a mixed-model was used to identify AFLP markers associated with...
    Resource Type:
    Dissertation
    Full Text:
    structure…….. 6 Genomic control…………………………………… 6 Structured association

  • Evaluation of carotenoids and anthocyanins in high pigment, processing, heirloom and anthocyanin fruit tomatoes

    Creator:
    Jones, Carl M.
    Resource Type:
    Masters Thesis
    Full Text:
    production in green tomato fruit is apparently under the control of a separate gene Psy-2 (Fraser et al

  • Development and use of molecular tools in Fragaria

    Creator:
    Njuguna, Wambui
    Abstract:
    This dissertation describes the application and development of molecular tools that have great potential for use in studying variation in strawberry germplasm. The first study evaluated 91 microsatellite (simple sequence repeat, SSR) markers for transferability in 22 Fragaria species and their utility in fingerprinting octoploid strawberries. Out of the transferable...
    Resource Type:
    Dissertation
    Full Text:
    ……….……….……….……….………. 11 Origin ...……….……….……….……….……….……….……… 11 Breeding progress ……….……….……….……….……….……. 11