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Tolerance in Cercospora arachidicola to Benomyl and Related Fungicides. R. H. Littrell, Assistant Professor, Department of Plant Pathology, University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton 31794; Phytopathology 64:1377-1378. DOI: 10.1094/Phyto-64-1377.

Isolates of Cercospora arachidicola tolerant to 5 µg/ml benomyl in vitro were found in six locations in four Georgia counties. Sensitive isolates did not grow on potato-dextrose agar with 0.5 µg/ml, while tolerant isolates grew with 160 µg/ml benomyl. Approximately one-third of the lesions collected from experimental plots that received six applications of Benlate, yielded tolerant isolates. No reduction in peanut yields was evident, however, when compared to other fungicides. Cross-tolerance was also found to methyl thiophanate (Topsin M) and 2-(methoxycarbamoyl)-benzimidazole (BAS 3460).

Additional keywords: methyl thiophanate, peanut, Arachis hypogaea.