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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 Degree Level Master's Remove constraint Degree Level: Master's

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  • 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

  • Toxicity of some commonly used pesticides to Trioxys Pallidus and its establishment in filbert orchards of Willamette Valley

    Creator:
    Saeed, Mohammad
    Abstract:
    A parasitic wasp, Trioxys pallidus Haliday (Hymenoptera: Aphidiidae) was imported from Europe and initially released against the filbert aphid Mvzocallis coryli (Goetze) in hazelnut (filbert) orchards of the Willamette Valley, Oregon beginning in 1984. In the present study, I investigated the establishment rates of this parasitoid. A total of 13...
    Resource Type:
    Masters Thesis
    Full Text:
    called Corylus californica), make the Willamette Valley of Oregon and the corresponding areas in