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Use of Dry Inoculum to Evaluate Beans for Resistance to Anthracnose and Angular Leaf Spot. D. A. Inglis, Former Research Associate, Department of Plant Pathology, University of Wisconsin-Madison, 53706. D. J. Hagedorn, and R. E. Rand. Emeritus Professor, and Research Specialist, Department of Plant Pathology, University of Wisconsin-Madison, 53706. Plant Dis. 72:771-774. Accepted for publication 24 March 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0771.

A simple method was developed for testing beans in the field for resistance to Colletotrichum lindemuthianum, cause of anthracnose, and Phaeoisariopsis griseola, cause of angular leaf spot. Dry inoculum prepared from diseased leaves of greenhouse-inoculated beans and from fungal cultures grown on perlite-cornmeal V-8 juice agar medium was dried, pulverized, and then dusted onto moistened bean plants. Data from field plots indicated that dry inoculum of C. lindemuthianum and P. griseola was as effective as an aqueous conidial suspension for inoculating beans. Mean leaflet ratings increased throughout the growing season, and inoculated treatments had significantly lower yields than noninoculated treatments.