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  • 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:
    attempts to exploit this mechanism for practical pest management (Jonsson et al. 2008). A number of

  • A model of trophic evolutionary pathways

    Creator:
    Morris, A. Kimo
    Abstract:
    Calow (1983) realized that differences between parasites and their free-living relatives can be explained by the differences in nutrient richness. I propose a model that is based on Calow's idea which identifies the relative position of different trophic strategies (e.g. predation, grazing, parasitism and others) based on (1) the differences...
    Resource Type:
    Masters Thesis
    Full Text:
    parasitoids have (Berry et al., 1997). Justification for this iconoclastic classification will be given

  • 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:
    1985 1990 1995 2000 2005 Y ie ld (m et ri c to ns /h ec ta re ) 10 12 14 16 18 20 22

  • 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:
    coast (Biron et al. 2000). Its crop host range includes: rutabagas, tuips, canola, broccoli