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  • Development of Diagnostic Assays for Race Differentiation of Podosphaera macularis

    Creator:
    Block, Mary H.
    Abstract:
    Hop powdery mildew (Podosphaera macularis) was confirmed in the Pacific Northwest in 1996. Before 2012, the most common race of P. macularis was able to infect plants that possessed powdery mildew resistance based on the R-genes Rb, R3, and R5. Post 2012, two additional races of P. macularis were discovered...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: ______________________________________________________ David H. Gent Hop powdery

  • The Influence of Nitrogen Fertility on Hop Quality, Pest Management, and the Stability of Biological Control

    Creator:
    Iskra, Anne E.
    Abstract:
    A multi-year field study was conducted in Oregon and Washington to evaluate the influence of nitrogen fertilization rate and timing on cone quality, nitrate accumulation in cones, severity of powdery mildew (caused by Podosphaera macularis), arthropod pests, and the stability of conservation biological control of the twospotted spider mite (Tetranychus...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ David H. Gent A multi-year field study was conducted in Oregon and Washington to

  • Identification and distribution of the mating-type locus and development of cleistothecia of Podosphaera macularis

    Creator:
    Wolfenbarger, Sierra N.
    Abstract:
    Podosphaera macularis, causal agent of hop powdery mildew, is known to produce cleistothecia (syn. chasmothecia) in eastern North America and Europe, but ascocarps are not reported from the Pacific Northwestern region of North America. Reasons for the apparent absence of cleistothecia in the Pacific Northwest are unknown. We established that...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ David H. Gent Podosphaera macularis, causal agent of hop powdery mildew, is known to

  • Addressing the relationship between Pseudoperonospora cubensis and P. humuli using phylogenetic analyses and host specificity assays

    Creator:
    Mitchell, Melanie N.
    Abstract:
    The two most economically important plant pathogens in the Pseudoperonospora (Peronosporaceae) genus are P. cubensis, causal agent of cucurbit downy mildew, and P. humuli, causal agent of hop downy mildew. These organisms have been shown to be very closely related phylogenetically and morphologically. In 2005, researchers in Korea proposed that...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ David. H. Gent Cynthia M. Ocamb The two most economically important plant pathogens in

  • Investigations of Black Leg and Light Leaf Spot on Brassicaceae Hosts in Oregon

    Creator:
    Claassen, Briana J.
    Abstract:
    The Pacific Northwest is an internationally important region for the production of Brassica seed and other seed crops including grass seed. Oregon lawmakers mandated research into the co-existence of canola (Brassica napus) with other Brassica production in the Willamette Valley and House Bill 2427 was signed into law in 2013,...
    Resource Type:
    Masters Thesis
    Full Text:
    committee members, Dr. David Gent for his help with statistical analyses and for constructive thesis edits

  • Spatiotemporal Assessment of Crop Histories in the Pacific Northwest

    Creator:
    Kumbhakar, Ishika G.
    Abstract:
    The cultivated potato (Solanum tuberosum) is one of the most important food crops in the United States, as well as globally. As demand rises, growers in the Pacific Northwest are revisiting their crop management strategies to determine whether there are additional ways to enhance crop productivity while managing plant and...
    Resource Type:
    Masters Thesis
    Full Text:
    regarding changes due to the COVID-19 pandemic. I also thank Dr. Julia Jones, Dr. David Gent, and Dr

  • Science Takes Flight: Detection of Black Leg on Turnip Gray Mold on Hemp

    Creator:
    Bates, Taylor A.
    Abstract:
    Disease detection through traditional techniques such as scouting fields on foot, molecular assays, or morphological identification of plant pathogens is time consuming and costly. Disease diagnosis in the field can be extremely subjective, and largely depends on the experience and knowledge of pathogen identification and disease quantification. This thesis provides...
    Resource Type:
    Masters Thesis
    Full Text:
    project development and edited all manuscripts. Dr. David H. Gent assisted in statistical analysis for

  • A comparison of the effects of stretch duration and repetitions on hamstring extensibility

    Creator:
    Mende, Gent N.
    Abstract:
    The increase in tissue extensibility and joint range of motion through stretching has often been demonstrated. However, the existence of an optimal stretch duration has not been proven and the identification of an ideal number of repetitions of a stretch has received little attention in the literature. The purpose of...
    Resource Type:
    Masters Thesis
    Full Text:
    repetitions on hamstring extensibility AN ABSTRACT OF THE THESIS OF Gent N. Mende for the degree of

  • Initial study of kiln drying clear Douglas fir planks

    Creator:
    Stillwell, H. D. and Oregon Forest Products Laboratory
    Abstract:
    Checking was influenced b drying conditions. This influence was greatest before average moisture content reached 20 per cent, but tension in surface layers caused checking even below this point. Neither high initial dry-bulb temperature nor initial conditions of high equilibrium moisture content were conducive to checking. High temperature and high...
    Resource Type:
    Technical Report
    Full Text:
    Planks By H. D. Stiliwell Report No. D-4 January 1957 OREGON FOREST PRODUCTS LABORATORY State Board

  • Concepts of Sustainability, Motivations for Pest Management Approaches, and Implications for Communicating Change

    Creator:
    Sherman, Jennifer and Gent, David H.
    Abstract:
    Impact and relevance are valued by both plant pathologists and the supporters of research and extension. Impact has been characterized as the “So what?” of research results, and in applied research in agriculture typically involves some change in human behavior. This might involve, for instance, avoidance of broad spectrum pesticides,...
    Resource Type:
    Article
    Full Text:
    - Corresponding author: David H. Gent, U.S. Department of Agriculture- Agricultural Research Service, Forage Seed