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Filtering by: Has journal Potato Research Remove constraint Has journal: Potato Research Decade 2000-2009 Remove constraint Decade: 2000-2009 Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • Assessment of potato tuber blight caused by Phytophthora infestans

    Creator:
    Glass, Jenny Rebecca
    Abstract:
    Late blight, caused by Phytophthora infestans, is a devastating problem to potato production in many parts of the world. While the foliar phases of this disease are well characterized, tuber infection, leading to quality losses and disease perpetuation, is less well understood. Experiments were conducted during 1998 and 1999 in...
    Resource Type:
    Masters Thesis
    Full Text:
    Assessment of Potato Tuber Blight Caused by Phytophthora

  • 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

  • Seedborne Phytophthora infestans : effect of pathogen clonal lineage and potato cultivar on seed transmission of late blight and plant growth responses

    Creator:
    Partipilo, Heather M.
    Abstract:
    Seed piece to plant transmission of the potato late blight pathogen, Phytophthora infestans, occurred with isolates of the clonal lineages US-8 in Oregon and US-11 in Washington in field trials. Average transmission rate across potato cultivars was 0.5 and 2.4% with US-8, and 0.8 and 1.0% with US-11 in 1999...
    Resource Type:
    Masters Thesis
    Full Text:
    Phytophthora infestans: Effect of Pathogen Clonal Lineage and Potato Cultivar on Seed Transmission of Late

  • Hop cone tip blight : a new disease in the Pacific Northwest

    Creator:
    Bienapfl, John C.
    Abstract:
    A necrosis at the tip of cones was observed on hop (Humulus lupulus), cultivar "Nugget", grown in Oregon in the early 1990's. Fusarium sambucinum and F. avenaceum were recovered from symptomatic cones in 1998 and preliminary inoculation experiments suggested both Fusarium species could cause hop cone necrosis. Studies were carried...
    Resource Type:
    Masters Thesis
    Full Text:
    . sambucinum recovered from a diseased potato tuber, individual isolates of F. equiseti and F. oxysporum from

  • 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:
    , has not been investigated previously. In this research, P. ramorum infected N. densiflorus bark

  • Effects of host resistance on Mycosphaerella graminicola populations

    Creator:
    Cowger, Christina
    Abstract:
    Mycosphaerella graminicola (anamorph Septoria tritici) causes Septoria tritici blotch, a globally important disease of winter wheat. Resistance and pathogenicity generally vary quantitatively. The pathogen reproduces both sexually and asexually, and the pathogen population is highly genetically variable. Several unresolved questions about the epidemiology of this pathosystem are addressed by this...
    Resource Type:
    Dissertation
    Full Text:
    professional judgment. Without his consistent, generous support and good management, the research would have

  • 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:
    cause of mortality is not well understood, but recent research indicates that stem water transport is

  • Examination of the role host-selective toxins play in fungal-plant interactions

    Creator:
    Andrie, Rachael M.
    Abstract:
    Pyrenophora tritici-repentis, causal agent of tan spot of wheat, produces multiple host-selective toxins (HSTs), including Ptr ToxA, encoded for by ToxA, Ptr ToxB, encoded for by ToxB, and Ptr ToxC. Variable distribution of these three HSTs among different isolates of P. tritici-repentis, both singularly and in all possible combinations, defines...
    Resource Type:
    Dissertation
    Full Text:
    of applications in fungal-related research areas. © Copyright by Rachael M. Andrie April 21

  • 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:
    effective disease mitigating measures, but more research is necessary to attain this important goal

  • Specificity of quantitatively expressed host resistance to Mycosphaerella graminicola

    Creator:
    Krenz, Jennifer E.
    Abstract:
    The specificity of quantitative host resistance to plant disease has long been a controversial issue. We examined interactions between wheat (Triticum aestivum) and Mycosphaerella graminicola, causal agent of Septoria tritici blotch, to determine whether specific interactions occur between host and pathogen genotypes that could be involved in eroding quantitatively expressed...
    Resource Type:
    Masters Thesis
    Full Text:
    resistance (55). Research on the quantitatively expressed resistance of potato to Phytophthora infestans