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Apple Powdery Mildew and Scab Control Studies in the Pacific Northwest. R. A. Spotts, Associate Professor, Department of Botany and Plant Pathology, Oregon State University, Mid-Columbia Experiment Station, 3005 Experiment Station Drive, Hood River 97031. R. P. Covey, Associate Plant Pathologist, Washington State University, Tree Fruit Research Center, Wenatchee 98801; and Iain C. MacSwan, Extension Plant Pathologist, Oregon State University, Corvallis 97331. Plant Dis. 65:1006-1009. Accepted for publication 17 February 1981. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-1006.

The sterol-inhibiting fungicides bitertanol, triadimefon, fenapanil, and CGA 64251 were all effective in the control of apple mildew and scab. Factors influencing the occurrence of these diseases in the major fruit-growing areas of the Pacific Northwest are discussed.