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Disease Control and Pest Management

Fitness of Venturia pirina Isolates Resistant to Benzimidazole Fungicides. E. Shabi, Division of Plant Pathology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel; Talma Katan, Division of Plant Pathology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. Phytopathology 70:1172-1174. Accepted for publication 28 May 1980. Copyright 1980 The American Phytopathological Society. DOI: 10.1094/Phyto-70-1172.

The competitive ability of carbendazim-resistant Venturia pirina, isolated from four pear orchards in Israel, was tested in greenhouse experiments and in the orchard, in the absence of the fungicide. Pear plants were inoculated with a mixture containing equal proportions of sensitive and resistant conidia. After 510 consecutive inoculations, the resistant isolates showed competitive ability equal to, or greater than, that of the sensitive wild type. V. pirina resistant to benzimidazole fungicides has persisted in pear orchards 4 yr after the withdrawal of these fungicides.

Additional keywords: adaptability, benomyl, pear scab, tolerance.