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Survival of Verticillium dahliae in soil

Creator:: Carlstrom, Robert Charles, 1928-
Abstract:: Three Oregon soil types (Chehalis silt loam (CSL), an alluvial soil from the Willamette Valley; Ayre sandy loam (ASL), a volcanic pumice soil from the Central high desert; and Klamath fine sandy loam (KFSL), a basaltic mineral soil from the Klamath Basin) were collected adjacent to fields which had been...
Resource Type:: Dissertation
Full Text:: OF VERTICILLIUM DAHLIAE IN SOIL Abstract approved; Redacted for Privacy R. L. Powelson Three Oregon

The influence of environment and pathogen variability on the infection of wheat by Puccinia striiformis West

Creator:: Beaver, Richard Gary, 1939-
Abstract:: Race identification of stripe rust (Puccinia striiformis West. ) is influenced by environment, pathogen variability and host age. Isolates of stripe rust were collected in the Pacific Northwest and characterized on two sets of differential varieties; the "Oregon" and the United States. Six of the seven isolates tested on the...
Resource Type:: Dissertation
Full Text:: STRIIFORMIS WEST. Abs,.ract approved: Redacted for Privacy R. L. Powelson Race identification of stripe rust

Factors affecting development of iris rhizome rot caused by Botrytis convoluta Whetzel and Drayton

Creator:: Maas, J. L.
Abstract:: Abundant conidial and sclerotial production occurs on iris plants infected with Botrytis convoluta Whetzel and Drayton during the cool moist months of the year. Experiments were designed to study the survival and inoculum potential of conidia and sclerotia. Basic nutritional requirements of the fungus in culture were also studied. Results...
Resource Type:: Dissertation
Full Text:: DRAYTON Abstract approved: Robert L. Powelson Abundant conidial and sclerotial production occurs on

Etiological studies on foot rot of wheat caused by Cercosporella herpotrichoides Fron.

Creator:: Byther, Ralph S.
Abstract:: Abundant conidial production occurs from colonized straws and plants infected with Cercosporella herpotrichoides Fron during the cool moist months of the growing season. Experiments were designed to study the survival, inoculum potential and competitive saprophytic ability of conidia in soil. Laboratory results indicated that cool moist soil favors the saprophytic...
Resource Type:: Dissertation
Full Text:: Robert L. Powelson Abundant conidial production occurs from colonized straws and plants infected with

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

Creator:: Shaner, Gregory Ellis
Resource Type:: Dissertation
Full Text:: Hansen for Gregory Ellis Shaner ACKNOWLEDGEMENTS I wish to thank Dr. R. L. Powelson for his

Quantitative epidemiology of stripe rust (Puccinia striiformis West.) in wheat cultivars (Triticum aestivum Vill.) with general resistance

Creator:: Young, Stanford Adams
Resource Type:: Dissertation
Full Text:: . Robert L. Powelson Stripe rust (Puccinia striiformis West.) resistance in wheat which does not allow

Suppression of take-all [Gaeumannomyces graminis (Sacc.) Arx & Olivier var. tritici Walker] of wheat (Triticum aestivum L.) by banded ammonium and chloride fertilizers

Creator:: Halsey, Mark Evan
Resource Type:: Dissertation
Full Text:: major professor, Dr. R. L. Powelson, this work would have been entirely impossible; I am very grateful

Forecasting Pseudocercosporella herpotrichoides foot rot of winter wheat

Creator:: Grybauskas, Arvydas P.
Abstract:: The use of fungicides for the control of foot rot of winter wheat, caused by Pseudocercosporella herpotrichoides (Fron) Dei., requires a forecast of disease risk to optimize this management practice ecologically and economically. Foot rot occurs in both the mild, wet (100+ cm, ppt./year) annual cropped areas in western Oregon,...
Resource Type:: Dissertation
Full Text:: - ture. Phytopathology 63:413-419. ROWE, R. C., and R. L. POWELSON. 1973. Epidemiology of Cercosporella

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:: . V. Homacki, M. L. Powelson, R. Ludy ABSTRACT For the past several years, vegetable growers in

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

ScholarsArchive@OSU

Survival of Verticillium dahliae in soil

The influence of environment and pathogen variability on the infection of wheat by Puccinia striiformis West

Factors affecting development of iris rhizome rot caused by Botrytis convoluta Whetzel and Drayton

Etiological studies on foot rot of wheat caused by Cercosporella herpotrichoides Fron.

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

Quantitative epidemiology of stripe rust (Puccinia striiformis West.) in wheat cultivars (Triticum aestivum Vill.) with general resistance

Suppression of take-all [Gaeumannomyces graminis (Sacc.) Arx & Olivier var. tritici Walker] of wheat (Triticum aestivum L.) by banded ammonium and chloride fertilizers

Forecasting Pseudocercosporella herpotrichoides foot rot of winter wheat

Sweet corn decline syndrome in Oregon's Willamette Valley

A potato growth and production model

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