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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:
    Response of downy brome (Bromus tectorum) and Kentucky

  • 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:
    disease evaluations indicated that the training system, rootstock, and cherry cultivar influence the

  • 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:
    of'Zimmerman' fits a 3:1 ratio 45 3.3 Field and greenhouse data for disease response are congruent 46 3.4

  • The Primary Disease Gradient of Wheat Stripe Rust (Puccinia striiformis f. sp. tritici) Across Spatial Scales

    Creator:
    Farber, Daniel
    Abstract:
    Wheat stripe rust (WSR), also called yellow rust of wheat (Tricitum spp.), causal agent Puccinia striiformis f.sp. tritici (Pst), is a foliar disease of major economic importance on wheat, especially grown in temperate locations. WSR causes major losses of wheat yield, estimated at nearly $ 1 billion per year, and...
    Resource Type:
    Dissertation
    Full Text:
    spread of WSR, bridging theoretical dispersal and disease ecology with plant epidemiology to provide

  • Genetic resistance to eastern filbert blight

    Creator:
    Coyne, Clarice Jean
    Abstract:
    Eastern filbert blight, caused by Anisogramma anomala (Peck) E. Muller, is a serious threat to hazelnut (Corylus avellana L.) production. Resistant cultivars offer the best control. Screening systems were needed to reliably identify disease, particularly in immune progeny derived from 'Gasaway'. An indirect enzyme-linked immunosorbant assay (ELISA) was developed using...
    Resource Type:
    Dissertation
    Full Text:
    1993. Disease incidence and proportion of wood cankered as determined by the two methods were

  • 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

  • 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:
    vitro tests. Plant Disease 73:957-959. Brown, C.R., H. Mojtahedi, and G.S. Santo. 1991. Resistance

  • 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:
    with the area under the disease progress curve (AUDPC) between 1 March and 15 April calculated from

  • Evaluation of genetic diversity in wild populations of black raspberry (Rubus occidentalis L.)

    Creator:
    Dossett, Michael
    Abstract:
    In recent years, there has been renewed interest in black raspberry (Rubus occidentalis L.) breeding. This has been spurred, in part, by an increase in black raspberry consumption due to studies that have shown them to be particularly high in anthocyanin content indicating high levels of antioxidants. Present cultivars are...
    Resource Type:
    Dissertation
    Full Text:
    . .......................................................................................... 44 Vigor, disease resistance, and fruit weight