Pathogenic Variability in Uromyces appendiculatus from Tanzania and Rust Resistance in Tanzanian Bean Cultivars. M. T. Mmbaga, Department of Botany, University of Dar es Salaam, Box 35060, Dar es Salaam, Tanzania. J. R. Stavely, Microbiology and Plant Pathology Laboratory, Plant Sciences Institute, USDA-ARS, Beltsville, MD 20705. Plant Dis. 72:259-262. Accepted for publication 10 October 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, 1988. DOI: 10.1094/PD-72-0259.

Nine Tanzanian races of the rust pathogen, Uromyces appendiculatus, were identified on 19 differential bean lines and cultivars. All nine races differed from previously described races. Differential cultivars Ecuador 299, Mexico 235, Mexico 309, and Compuesto Negro Chimaltenango were resistant and cultivars Kentucky Wonder 780, Golden Gate Wax, U.S. 3, and Pinto 650 were susceptible to all of these races. Some Tanzanian bean cultivars previously selected for field resistance in Tanzania were resistant to most Tanzanian and several U.S. races of the pathogen.