Angular Leaf Spot of Red Kidney Beans in Michigan. F. J. Correa, Graduate Student, Department of Botany and Plant Pathology, Agricultural Research Service, U.S. Department of Agriculture, Michigan State University, East Lansing 48824-1312. A. W. Saettler, Research Plant Pathologist, Agricultural Research Service, U.S. Department of Agriculture, Michigan State University, East Lansing 48824-1312. Plant Dis. 71:915-918. Accepted for publication 26 January 1987. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1987. DOI: 10.1094/PD-71-0915.

Numerous outbreaks of angular leaf spot (ALS), caused by Phaeoisariopsis griseola, were noted in Michigan fields of red kidney beans in 1982 and 1983. Variety tests revealed that navy, tropical black, and pinto beans were resistant, whereas red kidney and cranberry beans were susceptible. In some cases, foliage and pod reactions differed within the same cultivar. The pathogen survived at least two winters under Michigan conditions both in buried tissue and in infected standing plants. Strategies for control of ALS in Michigan should include crop rotation and incorporation of disease resistance into commercial red kidney bean cultivars.