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Received for publication September 6, 1973. This work is part of a cooperative project of the OR Agr. Exp. Sta. and the Western Region, ARS, USDA, and is published as Technical Paper No. 3605, OR Agr. Exp. Sta.
Research Plant Pathologist, Western Region, ARS, USDA and Dept. of Bot. and Plant Path., Oregon State University, Corvallis.
Superintendent, North Willamette Experiment Station, Oregon State University, Aurora.
The assistance of David Passon, Agr. Ext. Ser., Douglas County, and Thomas P. Davidson, Superintendent, Umatilla Experiment Station, Hermiston, is gratefully acknowledged, as is the contribution of the Dow Chemical Company, Midland, Michigan, in arranging for fumigation of the plots.
All agricultural chemicals recommended for use in this report have been registered by the Environmental Protection Agency. They should be applied in accordance with the directions on the manufacturer’s label as registered under the Federal Insecticide, Fungicide, and Rodenticide Act. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture, and does not imply its approval to the exclusion of other products that may also be suitable.
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