Control of Downy Mildew of Hops. C. B. Skotland, Irrigated Agriculture Research and Extension Center Washington State University, Prosser. Dennis A. Johnson, Irrigated Agriculture Research and Extension Center Washington State University, Prosser. Plant Dis. 67:1183. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-1183.