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<p><i>Alternaria brassicicola</i> isolates that were resistant to SDHI fungicides were found on broccoli in Kagawa Prefecture, Japan, in 2023 and 2024. The 11 isolates were resistant to boscalid, penthiopyrad, pyraziflumid, and inpyrfluxam (minimum inhibitory concentration [MIC] ≥ 2700&#xa0;ppm) on YB agar, with intermediate resistance to isofetamid (MIC 5&#xa0;ppm). In fungicide tests using a resistant isolate, only isofetamid significantly reduced disease severity compared with that in untreated controls. All resistant isolates had a point mutation (A to G) in the <i>SdhC</i> gene, leading to an amino acid substitution from histidine to arginine at position 134.</p>

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First report of SDHI-fungicide-resistant isolates of Alternaria brassicicola from broccoli in Japan

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Fumihiro Nishimura,
  • Takahiro Katayama,
  • Kenichi Ikeda

摘要

Alternaria brassicicola isolates that were resistant to SDHI fungicides were found on broccoli in Kagawa Prefecture, Japan, in 2023 and 2024. The 11 isolates were resistant to boscalid, penthiopyrad, pyraziflumid, and inpyrfluxam (minimum inhibitory concentration [MIC] ≥ 2700 ppm) on YB agar, with intermediate resistance to isofetamid (MIC 5 ppm). In fungicide tests using a resistant isolate, only isofetamid significantly reduced disease severity compared with that in untreated controls. All resistant isolates had a point mutation (A to G) in the SdhC gene, leading to an amino acid substitution from histidine to arginine at position 134.