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Filtering by: Has journal Potato Research Remove constraint Has journal: Potato Research Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Factors influencing the effects of host diversity on plant disease epidemics for wheat stripe rust and potato late blight

    Creator:
    Garrett, Karen A.
    Abstract:
    Most studies of plant disease epidemiology have focused on epidemics in host populations composed of a single genotype. But crop plant diversity can be a useful means of improving the deployment of resistance genes. In a series of experiments with wheat stripe rust and potato late blight, we studied factors...
    Resource Type:
    Dissertation
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    disease epidemics for wheat stripe rust and potato late blight AN ABSTRACT OF THE DISSERTATION OF

  • A potato growth and production model

    Creator:
    Apple, Jeanne Debons
    Abstract:
    A potato plant growth and production model is developed with the objectives of analyzing management alternatives and exploring the nature of the early dying syndrome. The geographic area of focus was the centerpivot irrigated circles of Oregon's Columbia Basin. A problem analysis of the potato production system of this area,...
    Resource Type:
    Dissertation
    Full Text:
    A Potato Growth and Production Model AN ABSTRACT OF THE

  • 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:
    Colorado potato beetle control (Lacey et al., 1999). 17 Early aldicarb research on M

  • In vitro culture and growth modeling of Tuber spp. and inoculation of hardwoods with T. melanosporum ascospores

    Creator:
    Michaels, Thomas Joseph
    Abstract:
    In vitro growth of twelve isolates of Tither spp., the true truffles, was quantified by an agar-melt procedure. All isolates grew poorly on media commonly used for the culture of mycorrhizal fungi, but responded markedly to the addition of nitrate, as well as other inorganic ions, to malt and potato-dextrose...
    Resource Type:
    Dissertation

  • Development and Application of Tools for Genetic Analysis of Clonal Populations

    Creator:
    Kamvar, Zhian N.
    Abstract:
    Research on the population genetics of microbial organisms requires the use of specialized analyses designed for clonal organisms to avoid violating the assumptions of traditional population genetic models. The tools necessary for performing these analyses existed as a set of unrelated software with non-overlapping capabilities and did not cover all...
    Resource Type:
    Dissertation
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    approved: Niklaus J. Grünwald Research on the population genetics of microbial organisms requires the use

  • Verticillium wilt of hops : pathogenicity, host range, and temperature relations of the causal agents

    Creator:
    Zehsazian, Hassan
    Abstract:
    Verticillium wilt of hops in Oregon, caused by Verticillium dahliae Kleb., was first reported in 1956. Later, V. albo-atrum Reinke & Berth. was also isolated from infected hop plants, and thus both species of the fungus were shown to be the causal agents of the disease in Oregon. The purpose...
    Resource Type:
    Dissertation
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    of the disease in Oregon. The purpose of this research was to study temperature rela- tions and

  • Production of polygalacturonase and macerating enzymes by Phoma menthae

    Creator:
    Melouk, Hassan Aly
    Abstract:
    The fungus Phoma menthae Strasser causes black lesions and cankers on stems and rhizomes of Mentha piperita L. The purpose of this thesis was to: 1) study the production of polygalacturonase (PG) and macerating enzymes (ME) by P. menthae in vivo and in vitro, 2) study the effects of phenolic...
    Resource Type:
    Dissertation
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    days old. ME activities were determined by an optical density method, using potato discs as substrate

  • Survival of Verticillium dahliae in soil

    Creator:
    Carlstrom, Robert Charles, 1928-
    Abstract:
    Three Oregon soil types (Chehalis silt loam (CSL), an alluvial soil from the Willamette Valley; Ayre sandy loam (ASL), a volcanic pumice soil from the Central high desert; and Klamath fine sandy loam (KFSL), a basaltic mineral soil from the Klamath Basin) were collected adjacent to fields which had been...
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    Dissertation
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    from potato pro- duction due to Verticillium wilt caused by the soil-borne fungus Verticillium

  • Contracting nucleolar vacuoles in somatic tobacco cells growing in microcultures

    Creator:
    Johnson, John Morris
    Abstract:
    Contracting nucleolar vacuoles are a general and consistent feature of somatic tobacco cells growing in microcultures. Nucleolar vacuoles were studied in cells from callus tissues of two single-cell clones, H-196 and H-239, of hybrid tobacco (Nicotiana tabacum X N. glutinosa). Vacuoles periodically contracted either completely or incompletely, apparently releasing a...
    Resource Type:
    Dissertation
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    carota var. sativa), potato (Solanum tuberosum), wheat (Triticum aestivum), annual bristleweed

  • Phylogeography and Evolution of Effector Genes in Phytophthora Species

    Creator:
    Shakya, Shankar K.
    Abstract:
    Plant pathogens in the genus Phytophthora are known to cause disease on field crops, nursery plants, and forest trees. The best known example probably is Phytophthora infestans, which triggered the infamous Irish potato famine. Other important Phytophthora species include: P. ramorum (sudden oak death pathogen), P. sojae (soybean root rot...
    Resource Type:
    Dissertation
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    infamous Irish potato famine. Other important Phytophthora species include: P. ramorum (sudden oak death