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Filtering by: Subject Douglas fir -- Diseases and pests -- Oregon Remove constraint Subject: Douglas fir -- Diseases and pests -- Oregon Committee Member Jepson, Paul Remove constraint Committee Member: Jepson, Paul

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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:
    ............................................................................................... 103 SEASONAL OVIPOSITION BY DELIA RADICUML. IN RUTABAGA AND TURNIP CROPS IN OREGON

  • Habitat management for beneficial insects on Willamette Valley vegetable and berry farms

    Creator:
    Russell, Michael C.
    Abstract:
    Conservation biological control involves manipulating farm landscapes or management systems to enhance populations of beneficial predators of agricultural pests. Farmscaping is one aspect of conservation biological control where predators of important pests are identified, the availability on the farm landscape of resources and habitat components needed by the beneficials to...
    Resource Type:
    Dissertation
    Full Text:
    scale is often associated with increased insect pest problems in agriculture (Altieri and Nichols 2004

  • Responses and relationships among Fusarium species, sweet corn, and western spotted cucumber beetles

    Creator:
    Miller, Nathan L. (Nathan Louis)
    Abstract:
    Sweet corn (Zea mays L.) yields in the Willamette Valley of Oregon have been declining since the early 1990’s. Studies were done to determine if there is a relationship between ear weight and several disease parameters including necrotic crowns or stalk nodes, nodal root rot, radicle root rot, and sub-crown...
    Resource Type:
    Dissertation
    Full Text:
    . Studies were done to determine if there is a relationship between ear weight and several disease