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<p><i>Spilosoma obliqua</i> (Lepidoptera: Arctiidae) is a&#xa0;polyphagous pest that causes significant economic losses in India. Conventional chemical insecticides used for its control harm beneficial insects and the environment. This study explores an eco-friendly alternative using <i>Amaranthus powellii</i> extract. Aerial parts of <i>A.&#xa0;powellii</i> were extracted with aqueous ethanol, and its effectiveness was tested against third instar larvae of <i>S.&#xa0;obliqua</i> under laboratory conditions using leaf-dip and topical application to evaluate the toxicity and lethal effects of <i>A.&#xa0;powellii</i> extract against third instars of <i>S.&#xa0;obliqua</i>. The LC<sub>50</sub> value was 46.873 ppm after three days, indicating bioactivity of polar compounds. Feeding activity declined significantly when larvae consumed <i>Ricinus communis</i> leaves treated with <i>A.&#xa0;powellii</i> extract, with consistent effects across developmental stages. The extract affected larval survival, pupation success, and adult emergence in a&#xa0;concentration-dependent manner. Higher concentrations prolonged pupation time, reduced pupal weight, and decreased pupation success. At 100–200 ppm, adult emergence was severely impacted, with deformities observed. These findings highlight <i>A.&#xa0;powellii</i> as a&#xa0;promising botanical insecticide, offering a&#xa0;sustainable alternative for managing <i>S.&#xa0;obliqua</i> while minimizing ecological risks.</p>

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Toxicity and Lethal Effect of Amaranthus powellii Extract Against the Polyphagous Pest Spilosoma obliqua (Lepidoptera: Arctiidae) Under Laboratory Conditions

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Nilay Singh,
  • Arvind Kumar,
  • Promila Sharma,
  • Manoj Kumar Pal,
  • Neetu Sharma,
  • Bhawana Bisht

摘要

Spilosoma obliqua (Lepidoptera: Arctiidae) is a polyphagous pest that causes significant economic losses in India. Conventional chemical insecticides used for its control harm beneficial insects and the environment. This study explores an eco-friendly alternative using Amaranthus powellii extract. Aerial parts of A. powellii were extracted with aqueous ethanol, and its effectiveness was tested against third instar larvae of S. obliqua under laboratory conditions using leaf-dip and topical application to evaluate the toxicity and lethal effects of A. powellii extract against third instars of S. obliqua. The LC50 value was 46.873 ppm after three days, indicating bioactivity of polar compounds. Feeding activity declined significantly when larvae consumed Ricinus communis leaves treated with A. powellii extract, with consistent effects across developmental stages. The extract affected larval survival, pupation success, and adult emergence in a concentration-dependent manner. Higher concentrations prolonged pupation time, reduced pupal weight, and decreased pupation success. At 100–200 ppm, adult emergence was severely impacted, with deformities observed. These findings highlight A. powellii as a promising botanical insecticide, offering a sustainable alternative for managing S. obliqua while minimizing ecological risks.