First Report of Melampsora occidentalis on Populus trichocarpa in the Central United States. B. D. Moltzan, Department of Plant Pathology, North Dakota State University, Fargo 58105. R. W. Stack, P. A. Mason, and M. E. Ostry. Department of Plant Pathology, North Dakota State University, Fargo 58105; and USDA Forest Service, St. Paul, MN 55108. Plant Dis. 77:953. Accepted for publication 13 April 1993. Copyright 1993 The American Phytopathological Society. DOI: 10.1094/PD-77-0953D.