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Filtering by: Creator Hayman, Glenn A. Remove constraint Creator: Hayman, Glenn A. Degree Level Doctoral Remove constraint Degree Level: Doctoral File Format application/pdf Remove constraint File Format: application/pdf

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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:
    puparia was monitored using emergence cages. A bimodal spring emergence pattern for CM was observed

  • A comparison of work values of emotionally disturbed adolescents and normal adolescents

    Creator:
    King, Reed Lewis
    Abstract:
    The primary purpose of this study was to determine the work values of the emotionally disturbed adolescents and to compare these values with those indicated by adolescents of the same age level from a regular public school. A secondary objective was to compare the work values of the age levels,...
    Resource Type:
    Dissertation
    Full Text:
    Lundberg, and Mr. Glenn Klein, who offered their constructive criticisms to complement this study. A

  • Distributional patterns and taxonomic structure of diatom assemblages in Netarts Bay, Oregon

    Creator:
    Whiting, Mark Carlos
    Abstract:
    Epiphytic, planktonic and benthic diatom assemblages were investigated in Netarts Bay, Oregon. Samples were collected for a one-year period from February 1980 to March 1981. A planktonic flora was observed only during periods of offshore enrichment when marine neritic species were abundant and were transported into the bay by tidal...
    Resource Type:
    Dissertation
    Full Text:
    investigated in Netarts Bay, Oregon. Samples were collected for a one-year period from February 1980 to March

  • 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:
    significantly reduced with the use of a bi-weekly oxamyl program that began at the hatch of the second

  • Stability of reporter gene expression and RNAi in transgenic poplars over multiple years in the field under vegetative propagation

    Creator:
    Li, Jingyi
    Abstract:
    Stable expression of transgenes is required for commercial uses of genetically engineered trees. To better understand the stability of transgene expression under field conditions, we studied transgene expression and RNA interference (RNAi)-induced transgene suppression in 2,480 transgenic poplars (460 transgene insertion events) over three years. Stability of expression was assessed...
    Resource Type:
    Dissertation
    Full Text:
    based on two reporter genes, green fluorescent protein (GFP) driven by a 35S promoter and the

  • Development of a hybrid modeling framework for intensively managed Douglas-fir plantations in the Pacific Northwest

    Creator:
    Weiskittel, Aaron R.
    Abstract:
    Forest growth models in the Pacific Northwest are predominantly empirical. Predictions of yield under alternative silvicultural regimes cannot rely completely on field trials; yet empirical growth models are often inadequate for extrapolating untested regimes and genotypes. The limitations of current models include (1) long time-steps (e.g. 5-10 years); (2) insufficient...
    Resource Type:
    Dissertation
    Full Text:
    Science presented on December 15, 2006. Title: Development of a Hybrid Modeling Framework for

  • Inner-shelf circulation off the central Oregon Coast

    Creator:
    Kirincich, Anthony R.
    Abstract:
    Inner-shelf circulation and mechanisms of across-shelf transport of water masses were examined using seven years of observations collected by the Partnership for Interdisciplinary Studies of Coastal Oceans (PISCO) program, a long-term monitoring effort along the central Oregon coast. Since 1998, moored velocity and hydrographic measurements have been obtained during the...
    Resource Type:
    Dissertation
    Full Text:
    Circulation off the Central Oregon Coast. Abstract approved: John A. Barth Inner-shelf circulation and

  • Determination of fluorochemicals in waste-dominated aqueous systems

    Creator:
    Huset, Carin A.
    Abstract:
    While fluorochemicals have been detected all over the world and in wastewater treatment plants, the effect of wastewater effluent on the receiving waters has not been evaluated. In the first study, the mass flow of fluorochemicals emanating from wastewater treatment plants along the Glatt River in Switzerland was evaluated. The...
    Resource Type:
    Dissertation
    Full Text:
    ABSTRACT OF THE THESIS OF Carin A. Huset for the degree of Doctor of Philosophy in Chemistry presented on

  • Plant communities and succession in Oregon coastal salt marshes

    Creator:
    Jefferson, Carol A.
    Abstract:
    The purpose of this study was to determine plant species composition, community structure, successional relationships, vegetational development and plant distributions in estuarine salt marshes on the Pacific Coast of Oregon. Quadrat and transect samples of plant presence and cover, collected from April 1971 - June 1974, were subjected to phytosociological...
    Resource Type:
    Dissertation
    Full Text:
    Oregon salt marshes in general. A few major species, including Triglochin maritimum, Salicornia vir

  • Remediation of atrazine in irrigation runoff by a constructed wetland

    Creator:
    Runes, Heather B.
    Abstract:
    Due to its frequent use in agriculture and its frequent detection in surface water, atrazine was chosen as a model compound to study the treatment capability of a surface flow wetland used to remediate irrigation runoff at a container nursery near Portland, Oregon. Further evaluation of treatment of atrazine was...
    Resource Type:
    Dissertation
    Full Text:
    Atrazine in Irrigation Runoff by a Constructed Wetland. Abstract approved: Due to its frequent use in