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<p>The release of natural enemies to control pests is generally based on the occurrence of the target pest and the control ability of the released natural enemies. However, under complex field conditions, the efficacy of pest control can be influenced by non-target prey that coexists with the target pest. <i>Neoseiulus bicaudus</i> (Wainstein) (Acari: Phytoseiidae), a generalist predator, feeds on various species, including <i>Tetranychus turkestani</i> (Ugarov et Nikolskii) (Acari: Tetranychidae) and <i>Frankliniella occidentalis</i> Pergande (Thysanoptera: Thripidae). <i>T. turkestani</i> and <i>F. occidentalis</i> often coexist and cause great damage to numerous crops. This study investigated the predation and preference of <i>N. bicaudus</i> towards two coexisting prey species at different prey stages, five prey ratios, and two densities. Additionally, to assess the impact of non-target prey, we evaluated its effect on the predation of target prey by predatory mites, with the two species acting as both target and non-target pests for each other. The results indicated that <i>N. bicaudus</i> preferred <i>T. turkestani</i> over <i>F. occidentalis</i>, showing a higher preference for mite larvae and eggs (17.90 and 17.70 individuals per day, respectively) compared to female adults and the two stages of thrips. The presence of non-target prey can promote the consumption of target prey by predatory mites. The impact index of female adult of <i>T. turkestani</i> on second instar nymphs of <i>F. occidentalis</i> was the highest (2.44). In conclusion, developing effective pest management strategies requires careful consideration of the complex dynamics and interactions among pests.</p>

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Predation efficacy of Neoseiulus bicaudus on a prey mixture of Frankliniella occidentalis and Tetranychus turkestani

  • 期刊论文

  • 发表日期：

    2025年3月16日

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  • An-Di Zhu,
  • Xin-Qi Liang,
  • Si-Qiong Tang,
  • Jie Su,
  • Jing Chen,
  • Zhi-Ping Cai,
  • Jian-Ping Zhang

摘要

The release of natural enemies to control pests is generally based on the occurrence of the target pest and the control ability of the released natural enemies. However, under complex field conditions, the efficacy of pest control can be influenced by non-target prey that coexists with the target pest. Neoseiulus bicaudus (Wainstein) (Acari: Phytoseiidae), a generalist predator, feeds on various species, including Tetranychus turkestani (Ugarov et Nikolskii) (Acari: Tetranychidae) and Frankliniella occidentalis Pergande (Thysanoptera: Thripidae). T. turkestani and F. occidentalis often coexist and cause great damage to numerous crops. This study investigated the predation and preference of N. bicaudus towards two coexisting prey species at different prey stages, five prey ratios, and two densities. Additionally, to assess the impact of non-target prey, we evaluated its effect on the predation of target prey by predatory mites, with the two species acting as both target and non-target pests for each other. The results indicated that N. bicaudus preferred T. turkestani over F. occidentalis, showing a higher preference for mite larvae and eggs (17.90 and 17.70 individuals per day, respectively) compared to female adults and the two stages of thrips. The presence of non-target prey can promote the consumption of target prey by predatory mites. The impact index of female adult of T. turkestani on second instar nymphs of F. occidentalis was the highest (2.44). In conclusion, developing effective pest management strategies requires careful consideration of the complex dynamics and interactions among pests.