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Filtering by: Subject Pear -- Diseases and pests -- Control -- Oregon -- Willamette River Valley Remove constraint Subject: Pear -- Diseases and pests -- Control -- Oregon -- Willamette River Valley Decade 2000-2009 Remove constraint Decade: 2000-2009

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  • 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:
    (.). ......................................................................8 3.1. Map offield study sites in northern Wilamete Valley, Oregon (Clackamas and Marion counties

  • Enhancing the predatory potential of hoverflies on aphids in Oregon broccoli fields with floral resources

    Creator:
    Ambrosino, Mario D.
    Abstract:
    Four key aspects of the relationship between predatory hoverflies and the aphid pest Brevicoryne brassicae L. on broccoli were investigated in the Willamette Valley, Oregon USA: 1) the relationship between aphid density and hoverfly oviposition, 2) the larval voracity of key hoverfly species, 3) the preferences of hoverflies and broccoli...
    Resource Type:
    Dissertation
    Full Text:
    Brevicoryne brassicae L. on broccoli were investigated in the Willamette Valley, Oregon USA: 1) the

  • New sources and linked AFLP markers for Eastern filbert blight resistance in hazelnut

    Creator:
    Chen, Honglin
    Abstract:
    Eastern filbert blight (EFB), caused by Anisogramma anomala (Peck) E. Miiller, is a devastating disease to orchards of the European hazelnut (Corylus avellana L.) in the Willamette Valley, Oregon. Host resistance is the most desirable means of disease control. Fifty-eight hazelnut accessions, including European cultivars and interspecific hybrids were evaluated...
    Resource Type:
    Masters Thesis
    Full Text:
    to orchards of the European hazelnut (Corylus avellana L.) in the Willamette Valley, Oregon. Host

  • Cover crop effects on root rot of sweet corn and soil properties

    Creator:
    Miyazoe, Mikio
    Abstract:
    Root rot of sweet corn in western Oregon and Washington is a significant disease that can reduce yield of intolerant cultivars of processed sweet corn by fifty percent. Root rot is caused by a complex of soilborne organisms, including Drechslera sp., Phoma terrestris, and Pythium arrhenomanes. Processors have adopted tolerant...
    Resource Type:
    Masters Thesis
    Full Text:
    cover crops in the Willamette Valley (Putnam, Oregon state Univ. disease clinic). BYDV is also an