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Genetics

Genetics, Pathogenicity, and Stability of Carbendazim-Resistant Isolates of Venturia pirina. E. Shabi, Division of Plant Pathology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel; T. Katan, Division of Plant Pathology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. Phytopathology 69:267-269. Accepted for publication 18 September 1978. Copyright 1979 The American Phytopathological Society. DOI: 10.1094/Phyto-69-267.

Nine single-spored cultures of carbendazim-resistant Venturia pirina were isolated from different pear orchards in which benomyl failed to control scab. These cultures retained resistance in the absence of the fungicide, produced typical sporulating lesions on Spadona pear plants, and transmitted the carbendazim resistance to the new conidiospores. All isolates had the same resistant phenotype. Crosses between resistant isolates and sensitive wild types, as well as among different resistant isolates, showed that carbendazim-resistance is conferred by a mutation in a single Mendelian gene and is not affected by modifying genes or cytoplasmic components.