Scholarlink

<p>The predatory mites, <i>Neoseiulus longispinosus</i> (Evans), remain one of the most frequently recorded indigenous biological control agent of <i>Tetranychus urticae</i> in India. Understanding the influence of acaricides on predatory mites is essential for the success of a pest management. In this study, we evaluated the effects of sublethal concentrations (LC₁₀ and LC₃₀) of cyenopyrafen on <i>Neoseiulus longispinosus</i> in F₁ generation by leaf dip bioassay method under laboratory conditions using age-stage, two-sex life table analysis. The egg, larval, protonymph, and deutonymph stages were notably prolonged for both sexes with increasing cyenopyrafen concentrations. However, the overall lifespan was significantly reduced at LC₁₀ and LC₃₀ compared to control. The shortest oviposition period was recorded at LC₃₀ (7.53 ± 0.12 days), with the lowest fecundity as females produced only 25.34 ± 0.23 eggs per female, along with the lowest egg hatchability. The marked reduction in male survival and female proportion suggests a potential disruption of reproductive dynamics in the population. The intrinsic rate of increase (<i>r</i>) and finite rate of increase (<i>λ</i>) were significantly lower at LC₃₀ and also mean generation time was significantly shorter at LC₃₀. Survival analysis showed that female survival rates were 77% at LC₁₀ and 62% at LC₃₀, whereas male survival rates were lower, at 25% and 17%, respectively. These findings indicate that sublethal exposure to cyenopyrafen may compromise the population growth potential of <i>N. longispinosus</i>, potentially limiting its role in suppressing <i>T. urticae</i> populations under field conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The sublethal effects of cyenopyrafen on life table and population traits of predatory mite, Neoseiulus longispinosus (Mesostigmata: Phytoseiidae) in F1 generation

  • 期刊论文

  • 发表日期：

    2026年1月29日

查看全文
  • Veerabhadrappa Sandeep,
  • Kenchappa Rajashekharappa,
  • Sharanabasappa S Deshmukh,
  • Rajendra Acharya,
  • Aishwarya Bellanki,
  • Gopalapura Narayanaswamy Tejashree

摘要

The predatory mites, Neoseiulus longispinosus (Evans), remain one of the most frequently recorded indigenous biological control agent of Tetranychus urticae in India. Understanding the influence of acaricides on predatory mites is essential for the success of a pest management. In this study, we evaluated the effects of sublethal concentrations (LC₁₀ and LC₃₀) of cyenopyrafen on Neoseiulus longispinosus in F₁ generation by leaf dip bioassay method under laboratory conditions using age-stage, two-sex life table analysis. The egg, larval, protonymph, and deutonymph stages were notably prolonged for both sexes with increasing cyenopyrafen concentrations. However, the overall lifespan was significantly reduced at LC₁₀ and LC₃₀ compared to control. The shortest oviposition period was recorded at LC₃₀ (7.53 ± 0.12 days), with the lowest fecundity as females produced only 25.34 ± 0.23 eggs per female, along with the lowest egg hatchability. The marked reduction in male survival and female proportion suggests a potential disruption of reproductive dynamics in the population. The intrinsic rate of increase (r) and finite rate of increase (λ) were significantly lower at LC₃₀ and also mean generation time was significantly shorter at LC₃₀. Survival analysis showed that female survival rates were 77% at LC₁₀ and 62% at LC₃₀, whereas male survival rates were lower, at 25% and 17%, respectively. These findings indicate that sublethal exposure to cyenopyrafen may compromise the population growth potential of N. longispinosus, potentially limiting its role in suppressing T. urticae populations under field conditions.