Index Catalog // ScholarsArchive@OSU

Spatial and chronological patterns of Purshia tridentata as influenced by Pinus ponderosa overstory

Creator:: Sherman, Robert James
Abstract:: Twelve sites of uniform topography and soils were selected in the Pinus ponderosa/Purshia tridentata/Festuca idahoensis Association. These sites were located in the rain shadow on the east flank of the Oregon Cascades. A fire history in the form of fire scars on ponderosa pine was available for nine of these...
Resource Type:: Masters Thesis
Full Text:: Influenced By Pinus Ponderosa Overstory AN ABSTRACT OF THE THESIS OF ROBERT JAMES SHERMAN for the M. S

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:: BY CERCOSPORELLA HERPOTRICHOIDES FRON Abstract approved: Redacted for Privacy Robert L. Powelson

Impact of raspberry bushy dwarf virus, raspberry leaf mottle virus, and raspberry latent virus on plant growth and fruit crumbliness in red raspberry (Rubus idaeus L.) 'Meeker'

Creator:: Quito-Avila, Diego F.
Abstract:: The United States is the third-largest producer of raspberries in the world. Washington State leads the nation in red raspberry (Rubus idaeus L.) production. 'Meeker', the most grown red raspberry cultivar in the Pacific Northwest (Washington, Oregon and British Columbia, Canada) is highly susceptible to Raspberry crumbly fruit, a virusinduced...
Resource Type:: Dissertation
Full Text:: , Wilhelm Jelkmann, Ioannis E. Tzanetakis, Karen Keller, and Robert R. Martin

Contributions to the plant ecology of the Oregon coastal sand dunes

Creator:: Wiedemann, Alfred M.
Abstract:: Sand dunes are found along the coasts of most of the large land masses of the world. Because of their proximity to man and his activities, the maritime sand dunes of Europe, particularly Germany, France, Holland and Scandinavia, have the longest history of stabilization activities and botanical investigation. There are...
Resource Type:: Dissertation
Full Text:: which this thesis is based. Special appreciation is expressed to the author's major profes- sor, Dr. W

An ecological study of the vegetation of the Bear River Migratory Bird Refuge, Box Elder County, Utah

Creator:: Kaltwasser, Robert George
Abstract:: During the summers of 1971, 1972, and 1973, a general floristic ecological survey of the naturally-occurring vegetation of the Bear River Migratory Bird Refuge in Utah was carried out. Ten community types were identified and characterized. These included two aquatic communities, the Potamogeton pectinatus (Pope) and the Ruppia maritima/ Zannichellia...
Resource Type:: Masters Thesis
Full Text:: Migratory Bird Refuge, Box Elder County, Utah AN ABSTRACT OF THE THESIS OF ROBERT GEORGE KALTWASSER for

An investigation into the ecology and distribution of Kalmiopsis leachiana (Hend.) Rehder

Creator:: Marquis, Robert John
Abstract:: Ecological factors associated with the relictual distribution of the endemic shrub Kalmiopsis leachiana (Ericaceae) were investigated. A prostrate evergreen species with small coriaceous leaves, K. leachiana is restricted to two disjunct populations in the Siskiyou Mountains and southern Cascade Mountains of southwestern Oregon, USA. Exact distributions of individual populations were...
Resource Type:: Masters Thesis
Full Text:: Kalmiopsis leachiana (Hend.) Rehder AN ABSTRACT OF THE THESIS OF Robert John Marquis for the degree of

Biology, epidemiology, and biological and chemical control of Phytophthora vignae

Creator:: Fernando, W. Gerard Dilantha
Abstract:: Phytophthora vignae, causal agent of stem and root rot of cowpea (Vigna unguiculata), was reported for the first time in Sri Lanka. The pathogen was found in cowpea field soils from 3 of 5 geographic regions sampled. Only one site however, had plants exhibiting disease symptoms. Of the eight cowpea...
Resource Type:: Dissertation
Full Text:: control of Phytophthora vignae AN ABSTRACT OF THE THESIS OF W. Gerard Dilantha Fernando for the degree

Taxonomy and host specificity of the genus Agrobacterium

Creator:: Anderson, Arthur Robert
Abstract:: One hundred seventy-eight Agrobacterium isolates, 120 United States (U.S.), 26 Australian and 32 of miscellaneous origin, were characterized for their reactions to 20 biochemical and physiological tests. Isolate pathogenicity and degree of host specificity, utilization of nopaline and octopine, and sensitivity to agrocin-84 also were determined. The U.S. isolates were...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF Arthur Robert Anderson for the degree of Doctor of Philosophy in Plant

The identification and quantification of Pyrenochaeta terrestris (Hansen) Gorenz, Walker, and Larson, propagules in soil and onion roots

Creator:: Flota, James Ernest
Resource Type:: Masters Thesis
Full Text:: approved: Robert L. Powelson Abundant dark-brown pigmented, thick-walled, multicellular microsclerotia of

Factors influencing the development of onion pink root disease incited by Pyrenochaeta terrestris (Hansen) Gorenz, Walker, Larson

Creator:: Pack, Paul Eugene
Abstract:: A study was conducted of the influence of various climatic and soil factors on the development of onion pink root disease and of the influences of temperature, light, pH, carbon and nitrogen sources, and vitamins on the growth in vitro of an Oregon isolate of the pink root fungus, Pyrenochaeta...
Resource Type:: Masters Thesis
Full Text:: experiments. Thanks is expressed to Dr. W. A. Frazier for help with the variety trials and to the

ScholarsArchive@OSU

Spatial and chronological patterns of Purshia tridentata as influenced by Pinus ponderosa overstory

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

Impact of raspberry bushy dwarf virus, raspberry leaf mottle virus, and raspberry latent virus on plant growth and fruit crumbliness in red raspberry (Rubus idaeus L.) 'Meeker'

Contributions to the plant ecology of the Oregon coastal sand dunes

An ecological study of the vegetation of the Bear River Migratory Bird Refuge, Box Elder County, Utah

An investigation into the ecology and distribution of Kalmiopsis leachiana (Hend.) Rehder

Biology, epidemiology, and biological and chemical control of Phytophthora vignae

Taxonomy and host specificity of the genus Agrobacterium

The identification and quantification of Pyrenochaeta terrestris (Hansen) Gorenz, Walker, and Larson, propagules in soil and onion roots

Factors influencing the development of onion pink root disease incited by Pyrenochaeta terrestris (Hansen) Gorenz, Walker, Larson

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