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Filtering by: Subject Apples -- Diseases and pests -- Control Remove constraint Subject: Apples -- Diseases and pests -- Control Academic Affiliation Crop and Soil Science Remove constraint Academic Affiliation: Crop and Soil Science Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • Small broomrape (Orobanche minor) management using wheat (Triticum aestivum) as a false host

    Creator:
    Al-thahabi, Salam A.
    Abstract:
    Small broomrape (Orobanche minor) is an obligate, chlorophyll-lacking parasite that parasitizes red clover (Trifolium pratense) roots. This study was conducted to develop and implement an integrated, biologically based control program for small broomrape by using wheat as a false host to reduce the soil seed bank. The relationship between temperature...
    Resource Type:
    Dissertation
    Full Text:
    and implement an integrated, biologically based control program for small broomrape by using wheat

  • Phenotypic response and quantitative trait loci for resistance to Cephalosporium gramineum in winter wheat

    Creator:
    Quincke, Martin C.
    Abstract:
    Cephalosporium stripe (Cephalosporium gramineum) is an important disease limiting adoption of conservation tillage practices in the Pacific Northwest. The disease can cause severe loss of grain yield and quality in winter wheat (Triticum aestivum L.). Modified cultural practices can reduce disease incidence, but are not always dependable because of variation...
    Resource Type:
    Dissertation
    Full Text:
    conditions and conflicts with soil conservations goals. The most desirable method of control would be

  • Cultural controls for suppressing Phytophthora cinnamomi root rot of blueberry

    Creator:
    Yeo, John R.
    Abstract:
    Phytophthora cinnamomi is a soilborne pathogen that causes root rot disease of highbush blueberry (Vaccinium corymbosum L.). When new installations of susceptible blueberry cultivars are infected with P. cinnamomi, plants often fail to grow significant new tissue, greatly reducing yields over the life of the planting. Chemical fungicides are available...
    Resource Type:
    Dissertation
    Full Text:
    disease control vs. a chemical alternative. The fungicide treatment was mulched with sawdust and

  • Phenology and monitoring of the cabbage maggot, Delia radicum (L.), in brassica root crops

    Creator:
    Dreves, Amy J.
    Abstract:
    In Oregon’s northern Willamette Valley, cabbage maggot (CM), Delia radicum (L.) (Diptera: Anthomyiidae) often renders Brassica root crops unmarketable. Scheduled insecticides are the only current control. Studies were conducted to: 1) describe and characterize spring emergence of CM flies and their seasonal flight activity relative to degree-day (DD) accumulations; 2)...
    Resource Type:
    Dissertation
    Full Text:
    control. Studies were conducted to: 1) describe and characterize spring emergence of CM flies and their

  • ALS-inhibitor resistant downy brome (Bromus tectorum L.) biotypes in Oregon : Mechanism of resistance, fitness, and competition

    Creator:
    Park, Kee-Woong
    Abstract:
    Understanding the mechanism of resistance, relative fitness and competitiveness of herbicide resistant biotypes is important to predict population dynamics and to establish resistance management strategies. This study was conducted to determine the level of resistance to acetolactate synthase (ALS) inhibitors and the mechanism of resistance of ALS-inhibitor resistant downy brome...
    Resource Type:
    Dissertation
    Full Text:
    Stahlman 1984). SU herbicides have been used successfully to control downy brome in winter wheat and