Browsing Extension Service -- Fact Sheets by Author "Powelson, R. L."

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Combating take-all root rot of winter wheat in western Oregon

Oregon State University. Extension Service.; Jackson, T. L. (Thomas Lloyd), 1922-; Powelson, R. L.; Christensen, Neil Walter, 1944- (Corvallis, Or. : Extension Service, Oregon State University, 1983-09)
Combating take-all root rot of winter wheat in western Oregon

Oregon State University. Extension Service.; Jackson, T. L. (Thomas Lloyd), 1922-; Powelson, R. L.; Christensen, Neil Walter, 1944- (Corvallis, Or. : Extension Service, Oregon State University, 1984)
Combating take-all root rot of winter wheat in western Oregon

Oregon State University. Extension Service; Jackson, T. L.; Christensen, N. W.; Powelson, R. L. (Corvallis, Or. : Extension Service, Oregon State University, 1981-09)
Recognizing and controlling Cephalosporium stripe, a disease of cereal grains

Oregon State University. Extension Service.; Karow, Russell S.; Powelson, R. L.; Koepsell, Paul A. (Corvallis, Or. : Extension Service, Oregon State University, 1985)
Use of soil fumigation for control of Verticillium wilt of potatoes

Oregon State University. Extension Service.; Powelson, R. L.; Carter, George E. (Corvallis, Or. : Extension Service, Oregon State University, 1964)