Multiple fungicide resistance to benzimidazoles, dicarboximides and diethofencarb in field isolates of Botrytis cinerea in Israel |
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Authors: | Y. ELAD H. YUNIS T. KATAN |
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Affiliation: | Department of Plant Pathology, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel |
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Abstract: | During the period January-March 1989, 15 greenhouses at 12 sites in Israel were surveyed for the presence of fungicide-resistant strains of Botrytis cinerea , using a fungicide-amended Botrytis -selective medium. Resistance to benzimidazoles (BenR) and to dicarboximides (DicR) was frequent in most sites. Resistance to carbendazim + diethofencarb (BenR NPCR) was found in all eight sites in which a mixture of these fungicides had been used against grey mould, but not in other sites. A new phenotype of multiple fungicide resistance was found among these isolates. The new phenotype, designated BenR DicR NPCR, combines the three previously described characteristics of resistance to benzimidazole, dicarboximide and N -phenylcarbamate fungicides. It was found only in cucumber greenhouses that had been sprayed with the fungicide mixture carbendazim + diethofencarb against grey mould. Isolates of this phenotype were pathogenic in artificial inoculation of cucumber cotyledons treated with carbendazim, iprodione or carbendazim + diethofencarb. |
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