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Filtering by: Subject Hazel -- Diseases and pests -- Northwestern States Remove constraint Subject: Hazel -- Diseases and pests -- Northwestern States Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • Classical biological control of the filbert aphid, Myzocallis coryli (Goetze) (Homoptera:Aphididae) in western Oregon

    Creator:
    Messing, Russell H.
    Abstract:
    A classical biological control project was undertaken against the filbert aphid, Myzocallis coryli (Goetze), in western Oregon. Hazelnut orchards in Spain, France, and Italy were searched for natural enemies of the aphid, and a parasitic wasp, Trioxys pallidus Haliday, was imported, quarantined, mass-reared, and released in Oregon orchards. The wasp...
    Resource Type:
    Dissertation
    Full Text:
    and Stebbins 1981). The filbert aphid, Myzocallis coryli (Goetze), is a perennial, serious pest in

  • Biology of sweet cherry powdery mildew

    Creator:
    Calabro, Jill M.
    Abstract:
    The Pacific Northwest has become one of the nation’s premier sweet cherry, Prunus avium, production areas. As production of sweet cherries has flourished in Oregon and Washington, so has powdery mildew, caused by the fungus Podosphaera clandestina, which infects both foliage and fruit causing severe economic damage to growers. Sweet...
    Resource Type:
    Dissertation
    Full Text:
    disease evaluations indicated that the training system, rootstock, and cherry cultivar influence the

  • Interactions of Amphorophora agathonica Hottes with raspberry viruses and resistant red and black raspberry

    Creator:
    Lightle, Danielle
    Abstract:
    In recent years, red raspberry production in Washington and British Columbia has been severely limited by a newly emerged virus complex that causes symptoms of crumbly fruit. The complex is comprised of three viruses: Raspberry bushy dwarf virus (RBDV), Raspberry leaf mottle virus (RLMV) and Raspberry latent virus (RpLV). Both...
    Resource Type:
    Dissertation
    Full Text:
    complexes, including black raspberry decline in black raspberry and raspberry crumbly fruit disease in red