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<p>The diamondback moth <i>Plutella xylostella</i> is a devastating pest of cruciferous crops known to develop high levels of insecticide resistance. Here, we examined the possibility of classical biological control against this pest in the USA via the introduction of a specialist larval parasitoid, <i>Diadegma semiclausum</i>. We compared life-history traits of three populations of <i>D. semiclausum</i> from France, Greece, and the Netherlands, as well as their performance on their local <i>P. xylostella</i> host population and two novel host populations from the USA (one resistant to insecticides and one susceptible). In addition, the performance of <i>D. semiclausum</i> was evaluated under semi-field conditions with four commercial varieties of cruciferous crops, and a competition experiment was conducted with <i>Diadegma insulare</i>, the main parasitoid of diamondback moth in North America. Results revealed that all parasitoid populations were able to successfully develop in the two USA host populations, but parasitism success was lower on insecticide-resistant hosts. Parasitism success and parasitism rates were higher on the original host populations than on the USA host populations. In semi-field cages, parasitism rate was similar on the four crop varieties and was positively correlated with ambient temperature. Finally, <i>D. semiclausum</i> parasitism rate was 6.7&#xa0;times higher than that of <i>D. insulare</i>, and parasitism rates of the two parasitoids were additive when they were placed together. These findings provide baseline data to support the selection of a <i>D. semiclausum</i> population likely to succeed if introduced in the USA and improve control of diamondback moth alongside <i>D. insulare</i>.</p>

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Evaluation of three European populations of Diadegma semiclausum as potential biological control agents for Plutella xylostella in the USA

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月24日

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  • Gaylord A. Desurmont,
  • Rieta Gols,
  • Marie-Claude Bon,
  • Javid Kashefi,
  • Arnaud Blanchet,
  • Benjamin Coelho,
  • Fatiha Guermache,
  • Elven Kerdellant,
  • Milla Menouillard,
  • Ricky Lara

摘要

The diamondback moth Plutella xylostella is a devastating pest of cruciferous crops known to develop high levels of insecticide resistance. Here, we examined the possibility of classical biological control against this pest in the USA via the introduction of a specialist larval parasitoid, Diadegma semiclausum. We compared life-history traits of three populations of D. semiclausum from France, Greece, and the Netherlands, as well as their performance on their local P. xylostella host population and two novel host populations from the USA (one resistant to insecticides and one susceptible). In addition, the performance of D. semiclausum was evaluated under semi-field conditions with four commercial varieties of cruciferous crops, and a competition experiment was conducted with Diadegma insulare, the main parasitoid of diamondback moth in North America. Results revealed that all parasitoid populations were able to successfully develop in the two USA host populations, but parasitism success was lower on insecticide-resistant hosts. Parasitism success and parasitism rates were higher on the original host populations than on the USA host populations. In semi-field cages, parasitism rate was similar on the four crop varieties and was positively correlated with ambient temperature. Finally, D. semiclausum parasitism rate was 6.7 times higher than that of D. insulare, and parasitism rates of the two parasitoids were additive when they were placed together. These findings provide baseline data to support the selection of a D. semiclausum population likely to succeed if introduced in the USA and improve control of diamondback moth alongside D. insulare.