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<p>For this study, phytoseiid mite species composition was examined using quantitative sequencing (QS) at six Japanese pear orchards with different pesticide practices in 2024 and 2025. Results indicate <i>Amblyseius eharai</i> Amitai et Swirski (Acari: Phytoseiidae) as the most dominant species at study sites where commercialized <i>Neoseiulus californicus</i> (McGregor) (Acari: Phytoseiidae) were introduced or where reduced use of chemical pesticides and fertilizers was conducted. By contrast, phytoseiid mites were rarely found or <i>N. californicus</i> was temporarily dominant at study sites for which conventional pesticide practices were applied. The proportion of sodium channel mutation (M918L) involved in pyrethroid resistance was also examined for phytoseiid mites using another QS. Results demonstrated that the resistant amino acid (L) was distributed in <i>A. eharai</i> and indigenous <i>N. californicus</i>. The spider mite survey, based on morphological characteristics, revealed <i>Tetranychus urticae</i> Koch (Acari: Tetranychidae) as present at study sites using conventional pesticide practices. At the other sites, <i>Tetranychus kanzawai</i> Kishida (Acari: Tetranychidae) infestation was observed in addition to that of <i>T. urticae</i>. Collectively, these results suggest that while pesticide practices are associated with the dominant species of phytoseiid mite and spider mite species in Japanese pear orchards, M918L is widespread among major indigenous phytoseiid mites, irrespective of pesticide practices.</p>

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Species composition of phytoseiid mites and spider mites, and distribution of sodium channel mutations in indigenous phytoseiids in Japanese pear orchards

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Mungunzaya Munkhtumur,
  • Fumiya Kikuchi,
  • Hidenari Kishimoto,
  • Masatoshi Toyama,
  • Shoji Sonoda

摘要

For this study, phytoseiid mite species composition was examined using quantitative sequencing (QS) at six Japanese pear orchards with different pesticide practices in 2024 and 2025. Results indicate Amblyseius eharai Amitai et Swirski (Acari: Phytoseiidae) as the most dominant species at study sites where commercialized Neoseiulus californicus (McGregor) (Acari: Phytoseiidae) were introduced or where reduced use of chemical pesticides and fertilizers was conducted. By contrast, phytoseiid mites were rarely found or N. californicus was temporarily dominant at study sites for which conventional pesticide practices were applied. The proportion of sodium channel mutation (M918L) involved in pyrethroid resistance was also examined for phytoseiid mites using another QS. Results demonstrated that the resistant amino acid (L) was distributed in A. eharai and indigenous N. californicus. The spider mite survey, based on morphological characteristics, revealed Tetranychus urticae Koch (Acari: Tetranychidae) as present at study sites using conventional pesticide practices. At the other sites, Tetranychus kanzawai Kishida (Acari: Tetranychidae) infestation was observed in addition to that of T. urticae. Collectively, these results suggest that while pesticide practices are associated with the dominant species of phytoseiid mite and spider mite species in Japanese pear orchards, M918L is widespread among major indigenous phytoseiid mites, irrespective of pesticide practices.