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Filtering by: Creator Carilli, Patrick B. Remove constraint Creator: Carilli, Patrick B. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology

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  • Genetic Structure in Populations of the Douglas-fir Swiss Needle Cast Fungus Nothophaeocryptopus gaeumannii

    Creator:
    Bennett, Patrick I.
    Abstract:
    The fungus Nothophaeocryptopus gaeumannii is the causative agent of Swiss needle cast (SNC), a foliar disease of Douglas-fir. Disease is characterized by premature loss of foliage and reduced growth resulting from the inhibition of photosynthesis due to the occlusion of stomata by the ascocarps of N. gaeumannii. Although the disease...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Patrick I. Bennett for the degree of Doctor of Philosophy in

  • Identification of Viruses Associated with Raspberry Leaf Curl Disease

    Creator:
    Guzman Martinez, Melinda
    Abstract:
    Raspberries are an important commodity worldwide, with the United States (U.S.) leading fourth in global production in 2017. An important factor when shipping propagated Rubus across the globe is the security of clean plant material verified through pathogen detection methods which is vital in preventing disease spread. A raspberry virus...
    Resource Type:
    Masters Thesis
    Full Text:
    . He also collected and provided the plant material utilized for Chapter 2 and Chapter 3. Patrick Di

  • Ozone flux in Helianthus annuus (L.)

    Creator:
    Smith, Elaine D.
    Abstract:
    Sunflower (Helianthus annuus L., cv. NK894) seedlings, grown hydroponically, were exposed to ozone concentrations of 0.0, 0.1, 0.2, and 0.3 ppm at 60% RH, or 0.0 and 0.3 ppm at 30% and 90% RH, for 6 h/d, for four consecutive days, at ages 15 to 18 days from seeding. Plant...
    Resource Type:
    Masters Thesis
    Full Text:
    Quatrano, and Dr. Patrick Breen, who served on my committee. I am indebted to the U. S. Environmental

  • The effects of Phytophthora ramorum infection on hydraulic conductivity and tylosis formation in tanoak sapwood

    Creator:
    Collins, Bradley R.
    Abstract:
    Tanoak (Lithocarpus densiflorus), along with some other members of Fagaceae, are susceptible to sudden oak death caused by the oomycete Phytophthora ramorum. Symptoms of the disease include dying crowns, bleeding cankers, and eventually death of infected trees. The cause of mortality is not well understood, but recent research indicates that...
    Resource Type:
    Masters Thesis
    Full Text:
    , D. J., Jules, E. S., & Ullian, B. (2000). Managing Port-Orford cedar and the introduced pathogen

  • Toward a flexible and accurate approach to null network sampling

    Creator:
    Bright, Zachary A.
    Abstract:
    Null networks are a type of random graph that is favored for the analysis of a wide variety of real-world networks, including gene-regulatory networks, food webs, and species co-occurrence matrices. As a hypothesis-generating tool, null networks are invaluable because they can reveal network motifs and unusual large-scale properties of networks...
    Resource Type:
    Masters Thesis
    Full Text:
    committee members, Patrick De Leenheer, John Fowler, and Mark Novak for their time and their helpfulness. I

  • Invasion by trees into a grassy bald on Marys Peak, Oregon Coast Range

    Creator:
    Magee, Teresa K.
    Abstract:
    Grassy balds are meadows that occur on or near the summits of montane peaks and ridges. The sites on which balds are located generally fall within the climatic tolerance ranges of associated tree species. This study evaluates the stability of a forest-meadow transition zone of such a bald on Marys...
    Resource Type:
    Masters Thesis
    Full Text:
    would also like to thank my committee members Dr. Kenton Chambers, Dr. Charles Warren, and Dr. Patrick

  • Plant-Pollinator Interactions in a Changing World: Cryptic Specialization, Pollinator Movement, and Landscape Genetics of Pollinator-Dependent Plants

    Creator:
    Gannon, Dustin G.
    Abstract:
    Plant-pollinator mutualisms are one of the most prevalent and economically important mutualisms in nature. Like many other ecological systems, plant-pollinator communities are threatened by anthropogenic activity, both directly (e.g., habitat conversion and fragmentation) and indirectly (e.g., climate change). While we are aware of many of the activities that adversely impact...
    Resource Type:
    Dissertation
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . . . 120 B Supplementary material for Chapter 2 . . . . . . . . . . . . . . . . . . . . . . 128 C

  • The Primary Disease Gradient of Wheat Stripe Rust (Puccinia striiformis f. sp. tritici) Across Spatial Scales

    Creator:
    Farber, Daniel
    Abstract:
    Wheat stripe rust (WSR), also called yellow rust of wheat (Tricitum spp.), causal agent Puccinia striiformis f.sp. tritici (Pst), is a foliar disease of major economic importance on wheat, especially grown in temperate locations. WSR causes major losses of wheat yield, estimated at nearly $ 1 billion per year, and...
    Resource Type:
    Dissertation
    Full Text:
    arising close to the source, and when fit to a modified inverse-power distribution had a slope (b) of

  • Biology and control of Fusarium spp. on Douglas-fir (Pseudotsuga menziesii)

    Creator:
    Hoefnagels, Mariëlle Henriette, 1965-
    Abstract:
    Fusarium spp. are among the most important pathogens of Douglas-fir (Pseudotsuga menziesii) seedlings in bareroot nurseries. Currently the most effective disease control method is soil fumigation with methyl bromide. As methyl bromide is phased out, however, other disease management strategies may become more important. We explored two alternative approaches to...
    Resource Type:
    Dissertation
    Full Text:
    : Joyce Loper, Peter Bottomley, Randy Molina, and Patrick Breen. I am especially grateful to Joyce Loper

  • Evolution and ecology of the Ceanothus-Frankia symbiosis

    Creator:
    Jeong, Soon-Chun
    Abstract:
    The evolutionary relationship between Frankia and actinorhizal plants was evaluated by reconstructing molecular phylogenetic trees from nifH, 16S rDNA, and rbcL nucleotide sequences. Subgroupings in Frankia phylogenetic trees reconstructed from nifH and from 16S rDNA sequences were consistent in terms of plant origins of Frankia strains. Although the branching order...
    Resource Type:
    Dissertation
    Full Text:
    would like to thank my committee Dr. Daniel Arp, Dr. Patrick Breen, Dr. Mark Daeschel, and Dr. Jeffrey