Index Catalog // ScholarsArchive@OSU

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 effects of DMSO on wound periderm formation in potato tuber tissue

Creator:: Davidson, Roy M., 1939-
Abstract:: A study was conducted to determine the influence of DMSO (dimethyl sulfoxide) on suberization and wound periderm formation in cut potato tuber tissue, and to determine the effectiveness of DMSO as a potato seedpiece treatment for prevention of seedpiece decay in the field. The influences of tuber storage conditions, varieties,...
Resource Type:: Masters Thesis
Full Text:: PERIDERM FORMATION IN POTATO TUBER TISSUE Abstract approved: Redacted for Privacy D. Robert L

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

Physiologic specialization of stripe rust (Puccinia striiformis West.) in the Pacific Northwest

Creator:: Beaver, Richard Gary, 1939-
Abstract:: The physiologic specialization of nine isolates of stripe rust (Puccinia striiformis West.) collected in the Pacific Northwest was determined. The separation of races was based on the differential susceptibility of the following wheat varieties: Cappelle Desprez, Chinese 166, Dippes Triumph, Druchamp, Etoile de Choisy, Flamingo, Gaines, Golden, Ibis, Leda, Michigan...
Resource Type:: Masters Thesis
Full Text:: Velda D. Mullins for Richard Gary Beaver ACKNOWLEDGMENT I wish to thank Dr. R. L. Powelson for his

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

The roles of Verticillium dahliae, Colletotrichum atramentarium, Erwinia carotovora subsp. carotovora and E. carotovora subsp. atroseptica in "early dying" disease of potatoes

Creator:: Kirkland, Marjorie Lynn
Abstract:: The primary cause of "early dying" disease of potatoes in Oregon is Verticillium dahliae; however, Colletotrichum atramentarium, Erwinia carotovora subsp. carotovora (Ecc) and E. carotovora subsp. atroseptica (Eca) are also commonly isolated from diseased plants. Therefore, field and greenhouse studies were initiated to determine the relative involvement of each pathogen,...
Resource Type:: Masters Thesis
Full Text:: . atroseptica in "Early Dying" Disease of Potatoes Abstract approved: Redacted for Privacy 'Mary L. Powelson

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

Role of inoculum sources of Botrytis cinerea in the epidemiology of gray mold of snap beans

Creator:: Johnson, Kenneth Bjorn
Abstract:: Spore dispersal gradients and pod disease gradients from point inoculum sources of Botrytis cinerea were measured over time in two snap bean field experiments. Laboratory grown inoculum was placed at ground level in a 30 x 30 cm square at bloom initiation and removed at full bloom. Dispersal of inoculum,...
Resource Type:: Masters Thesis
Full Text:: . Phytopathology 65:657-660. Rowe, R. C. and R. L. Powelson. 1973. Epidemiology of Cercosporella footrot of wheat

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

ScholarsArchive@OSU

Survival of Verticillium dahliae in soil

The effects of DMSO on wound periderm formation in potato tuber tissue

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.

Physiologic specialization of stripe rust (Puccinia striiformis West.) in the Pacific Northwest

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

The roles of Verticillium dahliae, Colletotrichum atramentarium, Erwinia carotovora subsp. carotovora and E. carotovora subsp. atroseptica in "early dying" disease of potatoes

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

Role of inoculum sources of Botrytis cinerea in the epidemiology of gray mold of snap beans

Forecasting Pseudocercosporella herpotrichoides foot rot of winter wheat

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