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>Limitations in the exploitation ofN‐phenylcarbamates andN‐phenylformamidoximes to control benzimidazole‐resistant Venturia nashicola on Japanese pear
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Limitations in the exploitation ofN‐phenylcarbamates andN‐phenylformamidoximes to control benzimidazole‐resistant Venturia nashicola on Japanese pear
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机译：Limitations in the exploitation ofN‐phenylcarbamates andN‐phenylformamidoximes to control benzimidazole‐resistant Venturia nashicola on Japanese pear
The efficacy ofN‐phenylcarbamates andN‐phenylformamidoximes against benzimidazole‐resistant strains ofVenturia nashicolawas tested experimentally in Japanese pear orchards. Both compounds gave effective control when applied in an orchard where highly benzimidazole‐resistant strains were predominant. However, unsatisfactory control was observed in an orchard where the fungal population was dominated by fungal strains with intermediate or weak benzimidazole resistance. Strains resistant toN‐phenylcarbamates andN‐phenylformamidoximes were widely distributed in Japanese pear orchards, suggesting that effective use of these compounds to control benzimidazole‐resistant strains ofV. nashicolawould not be practicable. Increased sensitivity toN‐phenylformamidoximes in highly benzimidazole‐resistant isolates was shown to be controlled by a single chromosomal gene, but progenies that were highly resistant to both a benzimidazole fungicide and aN‐phenylformamidoximes appeared in crosses between parents resistant to each fungicide alone. Similar strains were also found in pear orchards, and this‘double resistance’wa
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