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Benthic algal communities of the Metolius River

Creator:: Sherman, Barbara Jane Powell, 1938-
Abstract:: Samples of benthic algae were collected from the Metolius River of central Oregon at two-week intervals between April 15, 1967 and March 9, 1968. Species of filamentous algae and diatoms present were recorded for every sampling station on each sampling date. Permanent mounts of diatom frustules were prepared. This sampling...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE THESIS OF BARBARA JANE POWELL SHERMAN for the Ph. D. (Name) (Degree) in BOTANY (Major

Post-dispersal seed fates in a Western Oregon native prairie

Creator:: Clark, Deborah L.
Abstract:: Knowledge of post-dispersal seed fates and other regeneration characteristics is crucial for predicting abundances and distributions of populations and, ultimately, community species composition and diversity. Seed fate studies, however, are rare primarily due to the difficulty of determining seed fates and causes of mortality. This thesis investigated post-dispersal seed fates...
Resource Type:: Dissertation
Full Text:: Native Prairie. Abstract approved: Mark V. Wilson Knowledge of post-dispersal seed fates and other

Effect of iron on biological control of fire blight by Pseudomonas fluorescens A506

Creator:: Temple, Todd N.
Abstract:: Competitive exclusion has been the mechanism hypothesized to account for the biological control of fire blight disease of pear and apple by the bacterium Pseudomonas fluorescens A506 (A506). Recent laboratory assays demonstrated, however, that A506 produces an antibiotic that is toxic to the fire blight pathogen, Erwinia amylovora, when cultured...
Resource Type:: Masters Thesis
Full Text:: stigmas on the tips of the styles (Thomson, 1986). On the stigmas, the pathogen multiplies to attain

Lichen Functional Trait Variation Along an East-West Climatic Gradient in Oregon and Among Habitats in Katmai National Park, Alaska

Creator:: Spickerman, Kaleigh
Abstract:: Functional traits of vascular plants have been an important component of ecological studies for a number of years; however, in more recent times vascular plant ecologists have begun to formalize a set of key traits and universal system of trait measurement. Many recent studies hypothesize global generality of trait patterns,...
Resource Type:: Masters Thesis
Full Text:: -Espuny, L., Falczuk, V., Guerrero- Campo, J., Hynd, A., Jones, G., Kowsary, E., Kazemi-Saeed, F

Pendent Usnea (Lichens; Ascomycetes; Parmeliaceae) in Western Oregon : taxonomy; morphological characters; and geographical distribution

Creator:: Pittam, Sherry K.
Abstract:: Pendent Usnea species were collected in western Oregon and examined. Character states, such as cortex-medulla-axis ratio; fibril length; papilla diameter; branching patterns; and presence or absence of fibrils, papillae, soredia, isidia; plus chemistry, were recorded and analyzed by inspection for differences. Historical names were researched in the literature. A comparison...
Resource Type:: Masters Thesis
Full Text:: support through many years of my education. Dr. John Thomson provided me with several pages of Herre's

Evaluation of kasugamycin-use strategies designed to delay development of resistance in Erwinia amylovora

Creator:: Hubbard, Andrew Robert
Abstract:: The antibiotics, streptomycin sulfate and oxytetracycline, are used widely for fire blight suppression in the Pacific Northwest region of the United States. The efficacy of streptomycin, however, is compromised by widespread streptomycin-resistance in E. amylovora populations, and oxytetracycline is only partially effective. Consequently, for several years, the aminoglycoside antibiotic, kasugamycin...
Resource Type:: Masters Thesis
Full Text:: colony forming units (CFU) (i.e., bacterial cells) (Thomson, 1986). Pathogen colonies on styles are

Epidemiology of stripe rust (Puccinia striiformis west.) of wheat in Oregon

Creator:: Shaner, Gregory Ellis
Resource Type:: Dissertation
Full Text:: the western Columbia Basin (Wasco and Sherman Counties). Spore trapping records also showed that few

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:: plots were established at Sherman Experiment Station, Moro, Oregon, Pendleton Experiment Station

Comparative gibberellin relationships in tall and dwarf peas (Pisum sativum L.)

Creator:: Anderson, James David
Abstract:: Experiments were performed to determine whether a direct correlation exists between the growth rates of tall and dwarf peas grown either in the light or in the dark and endogenous gibberellin (GA) content. Three separate but related experimental approaches were utilized: (1) the determination of possible qualitative and /or quantitative...
Resource Type:: Dissertation
Full Text:: . , Galston, Tuttle and Penny, 1964; Lockhart, 1956; Parker et al. , 1949; Thomson, 1954; Thomson and Miller

Investigations of Black Leg and Light Leaf Spot on Brassicaceae Hosts in Oregon

Creator:: Claassen, Briana J.
Abstract:: The Pacific Northwest is an internationally important region for the production of Brassica seed and other seed crops including grass seed. Oregon lawmakers mandated research into the co-existence of canola (Brassica napus) with other Brassica production in the Willamette Valley and House Bill 2427 was signed into law in 2013,...
Resource Type:: Masters Thesis
Full Text:: first reported by Greville in 1823 on cabbage in Scotland (Thomson 1936), who named the fungus

ScholarsArchive@OSU

Benthic algal communities of the Metolius River

Post-dispersal seed fates in a Western Oregon native prairie

Effect of iron on biological control of fire blight by Pseudomonas fluorescens A506

Lichen Functional Trait Variation Along an East-West Climatic Gradient in Oregon and Among Habitats in Katmai National Park, Alaska

Pendent Usnea (Lichens; Ascomycetes; Parmeliaceae) in Western Oregon : taxonomy; morphological characters; and geographical distribution

Evaluation of kasugamycin-use strategies designed to delay development of resistance in Erwinia amylovora

Epidemiology of stripe rust (Puccinia striiformis west.) of wheat in Oregon

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

Comparative gibberellin relationships in tall and dwarf peas (Pisum sativum L.)

Investigations of Black Leg and Light Leaf Spot on Brassicaceae Hosts in Oregon

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