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Filtering by: Creator Sutton, Shan C. Remove constraint Creator: Sutton, Shan C. Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • 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:
    , bruising of fruit tissue was greatest when fruit were cooled below 10 °C in a study by Crisosto et al

  • 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:
    symptoms increased when stored at 21-24°C and more than 740 post- harvest DD5C were accumulated

  • Biology of chlamydospores of Phytophthora ramorum

    Creator:
    Smith, Aaron Lee
    Abstract:
    The chlamydospore is a survival spore produced by 35 of the 75 described species of Phytophthora. Phytophthora ramorum Werres, de Cock & Man in't Veld, the causal agent of Sudden Oak Death (SOD), produces abundant chlamydospores in artificial culture and plant tissue. The chlamydospore is likely the most important survival...
    Resource Type:
    Masters Thesis
    Full Text:
    chlamydospores of P. ramorum germinated at low and variable rates after 24 hours of incubation at 20 C in the

  • Functional groups, traits, and the performance of species in restoration

    Creator:
    Roberts, Rachael E. (Rachael Elaine)
    Abstract:
    In ecological restoration, species that are sown to increase the native plant diversity range in establishment ability. Some species readily establish, while others rarely do. This study set out to investigate some of the potential processes influencing species establishment, as well as the traits that are associated with the success...
    Resource Type:
    Masters Thesis
    Full Text:
     possible.   I would also like to thank Paul Reeser and Wendy Sutton in the Hansen lab for always  helping

  • Understanding sporulation and dissemination of Podosphaera macularis, hop powdery mildew

    Creator:
    Peetz, Amy B.
    Abstract:
    Podosphaera macularis causes one of the most important diseases, powdery mildew, of Humulus lupulus (hop). If left unmanaged, hop powdery mildew can cause total crop loss due to disease or browning of hop cones rendering the cones unmarketable to buyers. The Hop Powdery Mildew Infection Risk Index (HOPS) is heavily...
    Resource Type:
    Masters Thesis
    Full Text:
    disease pressure. The effects of constant exposure (5, 10, 15, 20, 25, 30, and 35°C) and 6 hr

  • Susceptibility of coast redwood seedlings to Phytophthora ramorum

    Creator:
    Lucas, Sunny L.
    Abstract:
    Coast redwood (Sequoia sempervirens) (D. Don) Endl. is a host for Phytophthora ramorum but it was unclear if the pathogen represents a significant disease risk to this tree species. In this study the susceptibility of coast redwood seedlings and the likelihood of sporulation on redwood were examined. Two methods were...
    Resource Type:
    Masters Thesis
    Full Text:
    (19°-20°C). Pathogen Colonization Distance Coast redwood seedling stems were

  • Systematics of the genus Otidea in the Pacific Northwest

    Creator:
    Peterson, Eric T.
    Abstract:
    The fungal ascomycete genus Otidea as represented in the Pacific Northwest of North America includes eight well known species and two poorly-known species. Cladistic analysis utilizing characters from ribosomal DNA and morphology allowed the development of a robust phylogenetic species concept for Otidea. The combination of characters from the ribosomal...
    Resource Type:
    Masters Thesis
    Full Text:
    ): 235-243. Hawksworth, D. L., P. M. Kirk, B. C. Sutton, P. N. Pegler. 1995. Ainsworth and Bisby's

  • Histological examination of Phytophthora ramorum in Notholithocarpus densiflorus bark tissues

    Creator:
    Botts, Molly M.
    Abstract:
    Colonization of N. densiflorus tissues by P. ramorum is not well understood. The pathogen is able to colonize nearly all tissues of this host but it is unclear how a tree is ultimately killed. Because this is such a destructive invasive pathogen, it is important to investigate its pathogenic strategy....
    Resource Type:
    Masters Thesis
    Full Text:
    . Wendy Sutton and Jen Britt for sharing knowledge and providing research assistance, particularly with

  • Castilleja and Pedicularis are confirmed as telial hosts for white pine blister rust in whitebark pine ecosystems of Oregon and Washington

    Creator:
    Mulvey, Robin L.
    Abstract:
    The primary objective of this research was to determine if native species within the genera Castilleja and Pedicularis are naturally infected by white pine blister rust (Cronartium ribicola) in whitebark pine ecosystems of the Oregon and Washington Cascade Range. Secondary objectives were to monitor the phenology of aecial and telial...
    Resource Type:
    Masters Thesis
    Full Text:
    of aecial and telial hosts to determine if there is sufficient time for C. ribicola to complete its

  • Examinations of Fusarium sambucinum on Humulus lupulus and co-infection with hop stunt viroid in commercial hop fields

    Creator:
    Cerruti, Natasha R.
    Abstract:
    After an unusually high incidence of Fusarium canker was observed in commercial hop fields of the Pacific Northwest, field surveys were conducted and revealed that canker incidence ranged from 20 to 60% of bines sampled in six commercial fields, as well as wide-spread Hop stunt viroid infection in these six...
    Resource Type:
    Masters Thesis
    Full Text:
    . oxysporum…….…...63 Appendix C- Effect of relative humidity on hop stem colonization by F