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<p>In Kochi Prefecture, Japan, <i>Passalora nattrassii</i>, cause of eggplant leaf mold, is the most prevalent pathogen of eggplant because of its fungicide resistance. Sequencing analysis revealed amino acid substitutions including SdhB-H268C, SdhB-H268R, SdhB-I270V, SdhC-N83S, and SdhC-H149R. In efficacy trials of SDHI fungicides, isofetamid and pyraziflumid were effective against all five mutants except for SdhB-I270V and SdhB-H268C, respectively. Pyribencarb provided higher efficacy than azoxystrobin against QoI-resistant isolates with cytb-G143A. These results indicate that different mutations at the target sites are responsible for the different sensitivity patterns in <i>P. nattrassii</i>.</p>

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Mutations in sdhB and sdhC genes confer different cross-resistance patterns to SDHI fungicides in isolates of Passalora nattrassii, causal agent of leaf mold in eggplant, and high efficacy of pyribencarb against cytb-mutant isolates

  • 期刊论文

  • 发表日期：

    2026年2月7日

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  • Yoshifumi Shimomoto,
  • Kensuke Seto,
  • Kazutaka Yano

摘要

In Kochi Prefecture, Japan, Passalora nattrassii, cause of eggplant leaf mold, is the most prevalent pathogen of eggplant because of its fungicide resistance. Sequencing analysis revealed amino acid substitutions including SdhB-H268C, SdhB-H268R, SdhB-I270V, SdhC-N83S, and SdhC-H149R. In efficacy trials of SDHI fungicides, isofetamid and pyraziflumid were effective against all five mutants except for SdhB-I270V and SdhB-H268C, respectively. Pyribencarb provided higher efficacy than azoxystrobin against QoI-resistant isolates with cytb-G143A. These results indicate that different mutations at the target sites are responsible for the different sensitivity patterns in P. nattrassii.