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<p>The two-spotted spider mite, <i>Tetranychus urticae</i> Koch is a major pest of horticultural and agricultural crops. It causes damage across all growth stages and quickly develop the resistance to most of acaricides. The aim of the study was to estimate the effect of chlorfenapyr on the demographic parameters of <i>T. urticae</i>, using the age-stage, two-sex life table tools. The experiment was conducted based on leaf dip bioassay method under laboratory conditions (27 ± 2°C, 65–80% RH and 16:08 (L:D) photoperiod) with the application of sublethal concentrations of chlorfenapyr (LC<sub>10</sub>, LC<sub>20</sub>, LC<sub>30</sub>) on <i>T. urticae</i>. Chlorfenapyr significantly reduced developmental stages at LC<sub>10</sub>, LC<sub>20</sub> and LC<sub>30</sub> treatment. The total lifespan of mites was significantly shortened in LC<sub>20</sub> (15.27 days for female and 14.56 days for male) and LC<sub>30</sub> treatments (14.06 days for females and 11.94 days for males). The lowest fecundity was recorded in LC<sub>20</sub> and LC<sub>30</sub> treatments with 28.73 and 23.30 offspring per female, respectively. The net reproductive rate (<i>Ro</i>) and the intrinsic rate of increase (<i>r</i>) decreased at LC<sub>30</sub> treatment with 14.09 offspring per individual and 0.14 day<sup>−1</sup>, respectively. In F<sub>2</sub> generation, egg period, larval duration, protonymph and deutonymph periods were prolonged in LC<sub>20</sub> and LC<sub>30</sub> treatment. Female longevity decreased with 8.04 days in LC<sub>20</sub> and 6.94 days in LC<sub>30</sub> treatment. The reduced fecundity was observed in LC<sub>20</sub> (28.75 offspring/female) and LC<sub>30</sub> treatment (22.87 offspring/female) in F<sub>2</sub> generation. The gross reproductive rate (<i>GRR</i>) was 16.87 offspring per individual at LC<sub>30</sub> treatment, which was found reduced compared to control with 42.75 offspring per individual. The intrinsic rate of increase (<i>r</i>) significantly decreased to 0.13 day<sup>−1</sup> at LC<sub>30</sub> treatment. Finally, the results concluded that the study underscores the importances of the potential application of chlorfenapyr in integrated mite management and the ecological risks linked to its multigenerational effects of <i>T. urticae</i>.</p>

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Lethal and sublethal effects of chlorfenapyr on the life history and population parameters of F1 and F2 generation of Tetranychus urticae Koch (Acari: Tetranychidae)

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Sandeep Veerabhadrappa,
  • Rajashekharappa Kenchappa,
  • Sharanabasappa S. Deshmukh,
  • Jayalaxmi Narayan Hegde,
  • Nagarajappa Adivappar,
  • Mallikarjuna Hosamane Basavarajappa

摘要

The two-spotted spider mite, Tetranychus urticae Koch is a major pest of horticultural and agricultural crops. It causes damage across all growth stages and quickly develop the resistance to most of acaricides. The aim of the study was to estimate the effect of chlorfenapyr on the demographic parameters of T. urticae, using the age-stage, two-sex life table tools. The experiment was conducted based on leaf dip bioassay method under laboratory conditions (27 ± 2°C, 65–80% RH and 16:08 (L:D) photoperiod) with the application of sublethal concentrations of chlorfenapyr (LC10, LC20, LC30) on T. urticae. Chlorfenapyr significantly reduced developmental stages at LC10, LC20 and LC30 treatment. The total lifespan of mites was significantly shortened in LC20 (15.27 days for female and 14.56 days for male) and LC30 treatments (14.06 days for females and 11.94 days for males). The lowest fecundity was recorded in LC20 and LC30 treatments with 28.73 and 23.30 offspring per female, respectively. The net reproductive rate (Ro) and the intrinsic rate of increase (r) decreased at LC30 treatment with 14.09 offspring per individual and 0.14 day−1, respectively. In F2 generation, egg period, larval duration, protonymph and deutonymph periods were prolonged in LC20 and LC30 treatment. Female longevity decreased with 8.04 days in LC20 and 6.94 days in LC30 treatment. The reduced fecundity was observed in LC20 (28.75 offspring/female) and LC30 treatment (22.87 offspring/female) in F2 generation. The gross reproductive rate (GRR) was 16.87 offspring per individual at LC30 treatment, which was found reduced compared to control with 42.75 offspring per individual. The intrinsic rate of increase (r) significantly decreased to 0.13 day−1 at LC30 treatment. Finally, the results concluded that the study underscores the importances of the potential application of chlorfenapyr in integrated mite management and the ecological risks linked to its multigenerational effects of T. urticae.