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Filtering by: Committee Member Hansen, Everett Remove constraint Committee Member: Hansen, Everett Subject Rhododendrons -- Diseases and pests Remove constraint Subject: Rhododendrons -- Diseases and pests

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  • Pathways of infection of Phytophthora ramorum in rhododendron

    Creator:
    Lewis, Carrie D.
    Abstract:
    Phytophthora ramorum, a plant pathogen, is the cause of sudden oak death and ramorum blight and shoot die-back. It has a wide host range including many native forest species and common nursery plants. The lack of knowledge regarding infection biology of P. ramorum limits our understanding of its ecology and...
    Resource Type:
    Masters Thesis

  • Comparative epidemiology of Phytophthora diseases of Rhododendron

    Creator:
    Taylor, Clare Rebecca
    Abstract:
    Rhododendron species are host to many Phytophthora species and are an important crop in the nursery industry. The foliar epidemiology of twelve Phytophthora diseases on Rhododendron was studied in field and growth chamber experiments on two Rhododendron cultivars. The relative aggressiveness of Phytophthora spp. was assessed using disease incidence, severity,...
    Resource Type:
    Masters Thesis
    Full Text:
    graduate studies committee, Walter Mahaffee, Chris Mundt, Everett Hansen and Shawn Mehlenbacher for

  • Viability and infective potential of Phytophthora pini zoospores in a recirculating irrigation system

    Creator:
    Shay, Sarah D.
    Abstract:
    Phytophthora pini Leonian, recently re-established from P. citricola I, is a pathogen with a wide range of forest and nursery hosts. It causes foliar infections in horticultural nurseries in Oregon, where recirculating irrigation systems are common. Increased use of recirculating irrigation systems may contribute to disease caused by waterborne plant...
    Resource Type:
    Masters Thesis
    Full Text:
    threshold value of propagules needed to initiate a successful disease epidemic (Hansen et al. 2005; Banko