Abstract
Abstract Isolates of Botrytis cinerea Pers.: Fr. collected from a range of crops in New Zealand, were tested for resistance to the dicarboximide fungicides by measuring radial growth on agar media amended with iprodione. In addition, each isolate was tested for resistance to the benzimidazole fungicides, by growing on medium amended with carbendazim, and for sensitivity to high osmotic pressure, by growing on medium amended with 0.68 M NaCl. In outdoor crops (grape, kiwifruit, strawberry, boysenberry) dicarboximide-resistant strains were found on only 2 of the 18 properties examined, one a vineyard and the other a strawberry planting. In neither instance was any loss of disease control apparent. No dicarboximide resistance was found on the single glasshouse grape property sampled, but on glasshouse vegetable crops (tomato, French bean, cucumber) dicarboximide resistance was found on all 7 properties. In these vegetable houses resistant strains were often predominant and in some instances there appeared to...
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