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<p><i>Coccinella septempunctata</i> L. (Coleoptera: Coccinellidae) is a key bio-control agent in agro-ecosystems, feeding on aphids and other soft-bodied insects. We investigated the toxicity and sublethal impacts of chlorantraniliprole on <i>C. septempunctata</i> under controlled conditions at 27 ± 2&#xa0;°C, 65–70% RH, and a 16:8&#xa0;h (L: D) photoperiod through age-stage, two-sex life table analysis. Our findings showed that chlorantraniliprole sublethal concentrations (LC<sub>10</sub>: 4.56&#xa0;mg a.i./L and LC<sub>30</sub>:14.84&#xa0;mg a.i./L) caused significantly impaired development and reproduction. Sublethal exposure at LC<sub>10</sub> and LC<sub>30</sub> significantly extended larval (particularly second and fourth instars) and pupal development, while adult longevity was significantly reduced. In contrast, adult and total pre-oviposition periods were not significantly affected. Fecundity declined markedly in a concentration-dependent way, resulting in significant reductions in key demographic parameters, including the intrinsic rate of increase (<i>rₘ</i>), finite rate of increase (<i>λ</i>), and net reproductive rate (<i>R</i><sub>0</sub>), particularly at LC<sub>30</sub>. Sublethal treatments also reduced age-stage reproductive value and life expectancy across developmental stages. These findings demonstrate that chlorantraniliprole, even at low concentrations; can disrupt the development, reproduction, and population growth of <i>C. septempunctata</i>, stressing the need for careful consideration of its use in integrated pest management programs.</p>

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Toxicity and sub-lethal impacts of chlorantraniliprole on the demographic parameters of Coccinella septempunctata L. (Coleoptera: Coccinellidae)

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Mst. Dilara khanom,
  • Md. Munem Shariar Rahman,
  • Md. Moshiur Rahman,
  • Md. Raihan Kabir,
  • Asma Ul Husna,
  • Mohammad Shaef Ullah,
  • Md. Nizam Uddin

摘要

Coccinella septempunctata L. (Coleoptera: Coccinellidae) is a key bio-control agent in agro-ecosystems, feeding on aphids and other soft-bodied insects. We investigated the toxicity and sublethal impacts of chlorantraniliprole on C. septempunctata under controlled conditions at 27 ± 2 °C, 65–70% RH, and a 16:8 h (L: D) photoperiod through age-stage, two-sex life table analysis. Our findings showed that chlorantraniliprole sublethal concentrations (LC10: 4.56 mg a.i./L and LC30:14.84 mg a.i./L) caused significantly impaired development and reproduction. Sublethal exposure at LC10 and LC30 significantly extended larval (particularly second and fourth instars) and pupal development, while adult longevity was significantly reduced. In contrast, adult and total pre-oviposition periods were not significantly affected. Fecundity declined markedly in a concentration-dependent way, resulting in significant reductions in key demographic parameters, including the intrinsic rate of increase (rₘ), finite rate of increase (λ), and net reproductive rate (R0), particularly at LC30. Sublethal treatments also reduced age-stage reproductive value and life expectancy across developmental stages. These findings demonstrate that chlorantraniliprole, even at low concentrations; can disrupt the development, reproduction, and population growth of C. septempunctata, stressing the need for careful consideration of its use in integrated pest management programs.