Yield Response and Resistance of Dry Beans to Powdery Mildew in Colombia. Howard F. Schwartz, Plant Pathologist, Bean Program, Centro International de Agricultura Tropical (CIAT), Apartado Aereo 6713, Cali, Colombia. Mary J. Katherman, Research Associate, and Michael D. T. Thung, Agronomist, Bean Program, Centro Internacional de Agricultura Tropical (CIAT), Apartado Aereo 6713, Cali, Colombia. Plant Dis. 65:737-738. Accepted for publication 9 January 1981. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-737.

An epidemic of powdery mildew (Erysiphe polygoni) reduced dry bean yields 17–69%, depending on the cultivar or breeding line. The pathogen was controlled by benomyl, and several resistant dry bean cultivars and breeding lines were identified.

Keyword(s): Phaseolus vulgaris.