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Filtering by: Subject Roots (Botany) -- Diseases and pests -- Control Remove constraint Subject: Roots (Botany) -- Diseases and pests -- Control Committee Member Johnson, Kenneth Remove constraint Committee Member: Johnson, Kenneth

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  • Response of downy brome (Bromus tectorum) and Kentucky bluegrass (Pao pratensis) to primisulfuron

    Creator:
    Hendrickson, Paul E.
    Abstract:
    Glasshouse and growth-chamber experiments were conducted to evaluate primisulfuron phytotoxicity and the influence of adjuvants on downy brome and Kentucky bluegrass. GR₅₀ (50% growth reduction) values were 0.97 ± 0.57 and 8.07 ± 1.85 g/ha for downy brome and Kentucky bluegrass, respectively. Primisulfuron was applied to downy brome and Kentucky...
    Resource Type:
    Masters Thesis
    Full Text:
    expressed as a percent of the control 3 wk after treatment with primisulfuron 13 1-3. Downy brome and

  • 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:
    1.3 Disease cycle of sweet cherry powdery mildew………...8 1.4 Disease forecasting and control

  • Multiple pest suppression with cover crops in strawberry

    Creator:
    Datta, Braja Bandhu
    Abstract:
    The experiment was conducted to compare multiple pest (weed, soil arthropod and diseases) suppression by cereal cover crops in 'Selva' and 'Totem' strawberry. In addition, perlite was used to compare improvement of soil and root aeration which might modify strawberry black root rot complex. Small-seeded summer annual weeds were suppressed...
    Resource Type:
    Masters Thesis
    Full Text:
    in both F. virginiana and F. chiloensis, including architecture, disease and pest resistance

  • Small broomrape (Orobanche minor) management using wheat (Triticum aestivum) as a false host

    Creator:
    Al-thahabi, Salam A.
    Abstract:
    Small broomrape (Orobanche minor) is an obligate, chlorophyll-lacking parasite that parasitizes red clover (Trifolium pratense) roots. This study was conducted to develop and implement an integrated, biologically based control program for small broomrape by using wheat as a false host to reduce the soil seed bank. The relationship between temperature...
    Resource Type:
    Dissertation
    Full Text:
    and implement an integrated, biologically based control program for small broomrape by using wheat

  • Investigation of novel sources of genetic resistance to eastern filbert blight

    Creator:
    Lunde, China F.
    Abstract:
    To identify novel host genetic resistance to eastern filbert blight, caused by the fungus Anisogramma anomala (Peck) E. Muller, ninety European hazelnut {Corylus avellana L.) varieties and interspecific hybrids (with C. americana Marsh, or C. colurna L.) were screened for response to the eastern filbert blight pathogen after inoculation in...
    Resource Type:
    Masters Thesis
    Full Text:
    the disease in Clackamas County near Damascus and Boring, OR. Planning for the control area was

  • 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:
    Carlson, H.L., B.B. Westerdahl, and H. Ferris. 1990. Columbia root-knot nematode biology and control

  • Overwintering survival of stem rust on perennial ryegrass : construction of a simulation model, and effects of the mycoparasite Sphaerellopisis filum

    Creator:
    Gordon, Tyler C.
    Abstract:
    Stem rust, caused by the fungus Puccinia graminis subsp. graminicola, can cause yield reductions exceeding 90% on perennial ryegrass (Lolium perenne L.) crops grown for seed if not treated with fungicide in the spring. There is evidence that late-spring stem rust epidemics are initiated by populations that survived the winter....
    Resource Type:
    Masters Thesis
    Full Text:
    Tyler C. Gordon for the degree of Master of Science in Botany and Plant Pathology presented on

  • Mulching to Manage Mummy Berry of Blueberry

    Creator:
    Florence, Jade
    Abstract:
    Monilinia vaccinii-corymbosi pseudosclerotia overwinter on the soil surface and produce apothecia in early spring, providing primary inoculum for Mummy Berry Disease of blueberry. Burial under 2.5 cm of soil or the absence of light have previously been identified as critical factors preventing the development of apothecia. Mulches were applied to...
    Resource Type:
    Dissertation
    Full Text:
    differentiation. Mulches were tested at the OSU Botany and Plant Pathology Field Lab, Corvallis, OR and at two