Biological and Cultural Plant Disease Controls: Alternatives and Supplements to Chemicals in IPM Systems. Barry J. Jacobsen, Dean, College of Agriculture, Montana State University, Bozeman 59717, and Paul A. Backman, Professor, Department of Plant Pathology, Auburn University, Auburn, AL 36849-5409. Plant Dis. 77:311-315. Copyright 1993 American Phytopathological Society. DOI: 10.1094/PD-77-311.