Search Constraints

Start Over
Filtering by: Has journal Entomologia Experimentalis et Applicata Remove constraint Has journal: Entomologia Experimentalis et Applicata License All rights reserved Remove constraint License: All rights reserved

Search Results

  • Assessing the safety of weed biological control : a case study of the cinnabar moth Tyria jacobaeae

    Creator:
    Fuller, Jason L.
    Abstract:
    The cinnabar moth, Tyria jacobaeae (L.) (Lepidoptera:Arctiidae), was released in 1959 to control the grassland weed tansy ragwort, Senecio jacobaea L. (Asteraceae), despite evidence that caterpillars of this species can feed on native plants within the genera Senecio and Packera. Previous studies confirmed the moth's ability to develop on the...
    Resource Type:
    Masters Thesis
    Full Text:
    , Simberloff and Stiling 1996, Follett and Duan 2000, Louda and Arnett 2000, Pemberton 2000, Wajnberg et al

  • Negative effect of purple loosestrife and reed canary grass on the diversity of wetland plant and moth communities

    Creator:
    Schooler, Shon
    Abstract:
    Invasive plants have the potential to reduce the diversity of species in plant and animal communities. I examined the negative effect of two invasive wetland plants, purple loosestrife and reed canary grass, on the species richness and diversity of plant and moth communities within 24 wetland study sites in the...
    Resource Type:
    Dissertation
    Full Text:
    been shown to reduce biological diversity and alter ecosystem processes (Randall 1996, Wilcove et al

  • Enhancing the predatory potential of hoverflies on aphids in Oregon broccoli fields with floral resources

    Creator:
    Ambrosino, Mario D.
    Abstract:
    Four key aspects of the relationship between predatory hoverflies and the aphid pest Brevicoryne brassicae L. on broccoli were investigated in the Willamette Valley, Oregon USA: 1) the relationship between aphid density and hoverfly oviposition, 2) the larval voracity of key hoverfly species, 3) the preferences of hoverflies and broccoli...
    Resource Type:
    Dissertation
    Full Text:
    . Ambrosino, P.C. Jepson, J.M. Luna JOURNAL: To be submitted to: Entomologia Experimentalis et Applicata

  • 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

  • Biology and management of Meloidogyne chitwoodi using oxamyl on potato in the western United States

    Creator:
    David, Nicholas L.
    Abstract:
    Field trials were conducted during 2001 to 2003 to investigate soil population dynamics of Meloidogyne chitwoodi, tuber symptom suppression using oxamyl, and post-harvest tuber symptom development on short-season potato varieties Russet Norkotah and Russet Nugget (San Luis Valley only). The experiments were located in the San Luis Valley in Colorado,...
    Resource Type:
    Dissertation
    Full Text:
    Golden et al., commonly referred to as the Columbia root-knot nematode. Potato production in states

  • 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

  • Biotic barriers to colonizing new hosts by the cinnabar moth Tyria jacobaeae (L.)(Lepidoptera: Arctiidae)

    Creator:
    Karacetin, Evrim
    Abstract:
    The cinnabar moth (Tyria jacobaeae (L.), Lepidoptera: Arctiidae) is an icon in population ecology and biological control that has recently lost its shine based on evidence that (1) it is less effective than alternatives (such as the ragwort flea beetle Longitarsus jacobaeae (Waterhouse) (Coleoptera: Chrysomelidae) for controlling ragwort Senecio jacobaea...
    Resource Type:
    Dissertation
    Full Text:
    to Idaho and Montana (Coombs et al. 2004). Although it is an icon in population ecology and

  • Assessing the impact of temperature on grape phenolic metabolism

    Creator:
    Cohen, Seth D.
    Abstract:
    Many climatic factors influence grape berry composition including nutrient status, water availability, biotic stress, sun exposure and temperature. Previous research examined the effects of many factors listed above and much progress has been made. It is often difficult, however, to separate effects that typically confound each other, such as sun...
    Resource Type:
    Masters Thesis
    Full Text:
    stresses (Swain, 1975; Stumpf and Conn, 1981; Bennett and Wallsgrove, 1994; Robards et al., 1997, 1999

  • Effects of esfenvalerate on native macroinvertebrates representative of Pacific Northwest streams

    Creator:
    Johnson, Katherine R.
    Abstract:
    Aquatic insects are essential components of healthy stream ecosystems, contributing to nutrient cycling, trophic dynamics and other ecological functions. Aquatic insect species, particularly those in the orders Ephemeroptera, Plecoptera and Trichoptera (EPT taxa) are however, extremely sensitive to insecticide contamination. Given that urban and agricultural use of synthetic pyrethroid insecticides...
    Resource Type:
    Dissertation
    Full Text:
    restoration exceeds $100 billion per year (Bonada et al. 2006). Since aquatic ecosystem restoration is a

  • Graphical models for multivariate spatial data

    Creator:
    Irvine, Kathryn M.
    Abstract:
    In this thesis we focus on a graphical model for multivariate spatially correlated data--isomorphic chain graphs (ICG; Gitelman and Herlihy, 2007). We feel ICG allow flexibility for modeling spatial correlation and are intuitively appealing because each model has an associated graph that visually represents a complex multivariate system. We examine...
    Resource Type:
    Dissertation
    Full Text:
    factorization for each model. We are able to rely on results provided in Andersson et al. (2001) and Gitelman