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Filtering by: Subject Vegetables -- Diseases and pests -- Control -- Oregon Remove constraint Subject: Vegetables -- Diseases and pests -- Control -- Oregon Creator Dreves, Amy J. Remove constraint Creator: Dreves, Amy J. Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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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:
    control. Studies were conducted to: 1) describe and characterize spring emergence of CM flies and their

  • Seasonal abundance, distribution, and migration of the clover aphid, Nearctaphis bakeri (Cowen) in red clover

    Creator:
    Dreves, Amy J.
    Abstract:
    Four sampling techniques were evaluated to estimate clover aphid, Nearctaphis bakeri (Cowen), abundance in red clover fields in the Willamette Valley. The Berlese funnel method detected one to four times more aphids than other sampling techniques. Visual assessment often underestimated the high aphid densities during the flowering and seeding of...
    Resource Type:
    Masters Thesis
    Full Text:
    untreated 1st and 2nd year red clover fields (A and C) and 2nd year clover field (B) in Corvallis, Oregon