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Filtering by: Subject Roses -- Rootstocks -- Diseases and pests -- Control Remove constraint Subject: Roses -- Rootstocks -- Diseases and pests -- Control Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • Effects of volatile fungicides on Sphaerotheca pannosa on rose

    Creator:
    Gallian, John J.
    Resource Type:
    Dissertation
    Full Text:
    and the most serious disease faced by the cut rose producer. Control in the greenhouse has been

  • Relation of nitrogenous substances in rose leaves to powdery mildew resistance

    Creator:
    Bartlett, Allan B.
    Abstract:
    There is considerable variation among rose varieties in susceptibility to mildew, and as a result of maturation, leaves of most susceptible varieties become resistant to infection. The nature of resistance has been sought in various studies involving environmental, morphological, and physiological factors. An attempt was made in the present investigation...
    Resource Type:
    Dissertation
    Full Text:
    disease. Two or more extracts from healthy and diseased leaves from each of the six rose varieties were

  • Coniothyrium rose canker in Oregon

    Creator:
    Intrama, Siriphong
    Abstract:
    An isolate of Coniothyrium obtained from a stem canker on Nocturne rose from the Botany Department Farm, Corvallis, Oregon was studied with respect to morphological and cultural characters, pathogenicity and mineral nutrition. The hyphae of the isolate were smooth, septate and branched. The hyphal cells averaged 16.37 X 3.52 microns....
    Resource Type:
    Dissertation

  • Studies on the etiology and epidemiology of bull's eye rot of pears

    Creator:
    Henriquez, Jose Luis, 1961-
    Abstract:
    The objective of this dissertation is to introduce low-cost processing methods for the fabrication of ZnO transparent thin-film transistors (TTFTs). A novel method for depositing ZnO body layers via spin-coating of a zinc nitrate-based spin solution is presented. The processing conditions of spin-coated ZnO are optimized to produce continuous and...
    Resource Type:
    Dissertation
    Full Text:
    , where the highest levels of disease were found at 10°C and at 30°C, respectively. Wetness duration did

  • Biology of sweet cherry powdery mildew

    Creator:
    Calabro, Jill M.
    Abstract:
    The Pacific Northwest has become one of the nation’s premier sweet cherry, Prunus avium, production areas. As production of sweet cherries has flourished in Oregon and Washington, so has powdery mildew, caused by the fungus Podosphaera clandestina, which infects both foliage and fruit causing severe economic damage to growers. Sweet...
    Resource Type:
    Dissertation
    Full Text:
    disease evaluations indicated that the training system, rootstock, and cherry cultivar influence the

  • Biology, epidemiology, and biological and chemical control of Phytophthora vignae

    Creator:
    Fernando, W. Gerard Dilantha
    Abstract:
    Phytophthora vignae, causal agent of stem and root rot of cowpea (Vigna unguiculata), was reported for the first time in Sri Lanka. The pathogen was found in cowpea field soils from 3 of 5 geographic regions sampled. Only one site however, had plants exhibiting disease symptoms. Of the eight cowpea...
    Resource Type:
    Dissertation
    Full Text:
    cultivars and other legumes grown in Sri Lanka, and (2) disease control using biological control agents

  • 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:
    control M. chitwoodi densities in the soil. For that reason, internal and external symptoms

  • The epidemiology of sudden oak death in Oregon forests

    Creator:
    Peterson, Ebba K.
    Abstract:
    The phytopathogen Phytophthora ramorum (Werres, DeCock & Man in't Veld), causal agent of Sudden Oak Death (SOD) of oaks (Quercus spp.) and tanoaks (Notholithocarpus densiflorus syn. Lithocarpus densiflorus), is established in coastal forests of the western United States. Since the discovery of SOD in the Douglas-fir / tanoak forests of...
    Resource Type:
    Dissertation
    Full Text:
    understand and control P. ramorum in natural, landscaped, and nursery environments. This work aims to

  • Characterization, epidemiology, and ecology of a virus associated with black raspberry decline

    Creator:
    Halgren, Anne B.
    Abstract:
    The objective of this study was to characterize an unknown agent associated with decline in black raspberry (Rubus occidentalis) in Oregon. A virus was found consistently associated with decline symptoms of black raspberries and was named Black raspberry decline associated virus (BRDaV). Double stranded RNA extraction from BRDaV-infected black raspberry...
    Resource Type:
    Dissertation
    Full Text:
    disease control is not feasible. Often, controlling the invertebrate vector is the primary and most

  • Candidate Genes Associated with Blister Rust Resistance in Whitebark Pine (Pinus albicaulis) Revealed through de novo Transcriptome Assembly and Differential Gene Expression Analysis

    Creator:
    Bair, Zolton J.
    Abstract:
    Whitebark pine (Pinus albicaulis) is an iconic North American high-elevation tree species currently threatened by climate change, mountain pine beetle, and white pine blister rust (WPBR), a lethal disease caused by the non-native fungal pathogen Cronartium ribicola. In collaboration with the USDA Forest Service Dorena Genetic Resource Center, germplasm was...
    Resource Type:
    Dissertation
    Full Text:
    , who was instrumental in advancing my thinking about plant disease dynamics, epidemiology, and