Index Catalog // ScholarsArchive@OSU

Sweet corn decline syndrome in Oregon's Willamette Valley

Creator:: Hoinacki, Elisabeth V.
Abstract:: For the past several years vegetable growers in Oregon's Willamette Valley have experienced reduced yields in their sweet corn plantings. We conducted studies to 1) describe the symptomology and etiology of the disease, 2) test a root rot rating system we developed to evaluate factors in the disease syndrome, and...
Resource Type:: Dissertation
Full Text:: Decline Syndrome in Oregon's Willamette Valley Abstract approved: Mary L. Powelson For the past several

A potato growth and production model

Creator:: Apple, Jeanne Debons
Abstract:: A potato plant growth and production model is developed with the objectives of analyzing management alternatives and exploring the nature of the early dying syndrome. The geographic area of focus was the centerpivot irrigated circles of Oregon's Columbia Basin. A problem analysis of the potato production system of this area,...
Resource Type:: Dissertation
Full Text:: ....", .r , le Mary L. Powelson A potato plant growth and production model is developed with the

Effects of intercropping beans with maize on angular leaf spot and rust of beans

Creator:: Boudreau, Mark Alan, 1958-
Abstract:: Experiments were performed to determine the nature of maize influence on bean disease in additive-type intercrops. Overall effects of intercrops on angular leaf spot (caused by Phaeoisariopsis griseola) in Kenya indicated >23% reductions (P<0.05) in area under the disease progress curve (AUDPC) in two of three season-site combinations. Fertilization tended...
Resource Type:: Dissertation
Full Text:: Phaeoisariopsis griseola) in Kenya indicated >23% reductions (P<0.05) in area under the disease progress curve

The application of mathematical models in the epidemiology of foot rot of wheat caused by Cercosporella herpotrichoides Fron.

Creator:: McCoy, Mary Lois
Resource Type:: Dissertation
Full Text:: MARY LOIS McCOY for the DOCTOR OF PHILOSOPHY (Name) (Degree) in Plant Pathology presented on (Major

Production dynamics of a Zostera marina L. bed in Netarts Bay, Oregon

Creator:: Kentula, Mary E.
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF Mary E. Kentula for the degree of

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:: the Western United States. Abstract approved: Russell E. Ingham Field trials were

Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

Creator:: Geddens, Ray M.
Abstract:: Eight postemergence herbicides were evaluated to determine their influence on the incidence and severity of take-all disease caused by the fungus Gaeumannomyces graminis var. tritici in winter wheat. Mecoprop ((+)-2-(4-chloro-2-methylphenoxy)propanoic acid), difenzoquat (1,2- dimethyl- 3,5- diphenyl -1H- pyrazolium), dinoseb amine (amine salt of 2-(1-methylpropy1)-4,6-dinitrophenol), and diclofopmethyl (methyl ester of (+)-2-[4-(2,4-dichlorophenoxy)...
Resource Type:: Dissertation
Full Text:: : Redacted for Privacy Arnold P. Appleby Redacted for Privacy Robert L. Powelson Eight postemergence

Phenotypic variation in diploid and tetraploid populations of Claytonia perfoliata (s.l.) (Portulacaceae)

Creator:: Miller, John M.
Abstract:: Meiotic chromosome counts from 200 populations of Claytonia (Montia) perfoliata (sensu lato) reveal a polyploid pillar complex based on three morphologically different, chemically distinct, and geographically defined diploids. The basic chromosome number is x=6. Diploid C. perfoliata Willdenow with linear juvenile leaves and deltoid mature basal leaves ranges southeastward from...
Resource Type:: Dissertation
Full Text:: presented March 29, 1978 Typed by Mary Jo Stratton for John M. Miller ACKNOWLEDGEMENTS I wish to convey

Factors influencing the effects of host diversity on plant disease epidemics for wheat stripe rust and potato late blight

Creator:: Garrett, Karen A.
Abstract:: Most studies of plant disease epidemiology have focused on epidemics in host populations composed of a single genotype. But crop plant diversity can be a useful means of improving the deployment of resistance genes. In a series of experiments with wheat stripe rust and potato late blight, we studied factors...
Resource Type:: Dissertation
Full Text:: , Ken Johnson, Mary Powelson, and Tim Schowalter, for their support in the preparation of this work

Bioindication of air quality in forests of northern and central California using epiphytic macrolichen communities

Creator:: Jovan, Sarah
Abstract:: The unifying purpose of this dissertation was to describe, model, and map relationships between epiphvtic macrolichen communities and air quality in Ibrests of northern and central California. First, multivariate analyses were used to subdivide the large study area into three model areas with similar climate, topography, and lichen communities: the...
Resource Type:: Dissertation
Full Text:: Commencement June 2005 Doctor 0! Philosophy dissertation o! Surah Jovan presented on May 19 2005. A P P ROy

ScholarsArchive@OSU

Sweet corn decline syndrome in Oregon's Willamette Valley

A potato growth and production model

Effects of intercropping beans with maize on angular leaf spot and rust of beans

The application of mathematical models in the epidemiology of foot rot of wheat caused by Cercosporella herpotrichoides Fron.

Production dynamics of a Zostera marina L. bed in Netarts Bay, Oregon

Biology and management of Meloidogyne chitwoodi using oxamyl on potato in the western United States

Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

Phenotypic variation in diploid and tetraploid populations of Claytonia perfoliata (s.l.) (Portulacaceae)

Factors influencing the effects of host diversity on plant disease epidemics for wheat stripe rust and potato late blight

Bioindication of air quality in forests of northern and central California using epiphytic macrolichen communities

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