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<p>The fall armyworm, <i>Spodoptera frugiperda</i> (J.E. Smith) (Lepidoptera: Noctuidae), is a globally significant agricultural pest capable of devastating cereal crops and other economically important plants. The present study investigates the in vitro inhibitory effects of copper(II) sulfate (CuSO₄), ethylenediaminetetraacetic acid (EDTA), and sodium chloride (NaCl) on key carbohydrate-digesting enzymes in the fourth instar of <i>S. frugiperda</i>, with a particular emphasis on invertase. Enzyme activity profiling revealed that invertase dominates carbohydrate metabolism in adults, while trehalase and amylase are more active in larvae. CuSO₄ exhibited the strongest inhibition, completely suppressing invertase, trehalase, and amylase activity at 0.5&#xa0;M (<i>P</i> &lt; 0.01), with significant dose-dependent suppression evident even at 0.01&#xa0;M. EDTA exerted significant but less potent inhibition, reducing enzyme activities by approximately 24–38% at 0.5&#xa0;M (<i>P</i> &lt; 0.01). NaCl showed negligible inhibitory effects across all tested concentrations (0.1–2.0&#xa0;M; <i>P</i> &gt; 0.05 at ≤ 0.1&#xa0;M for amylase). Notably, CuSO₄ inhibition was rapid, requiring less than two minutes to achieve near-complete suppression at 25&#xa0;°C, and was significantly influenced by temperature. The strong inhibitory effect of CuSO₄ suggests that it disrupts key metabolic pathways in <i>S. frugiperda</i>, likely through protein denaturation and metal ion interference. These findings highlight the potential of CuSO₄ as a biochemical disruptor that could be further explored as a novel pest control strategy. Future research should focus on in vivo assessments of CuSO₄ toxicity, its interactions with insect physiological processes, and its potential integration into sustainable pest management programs.</p>

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Inhibition of carbohydrate-digesting enzymes in Spodoptera frugiperda (Lepidoptera: Noctuidae): implications for pest control

  • 期刊论文

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  • 发表日期：

    2026年5月18日

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  • Nedal M. Fahmy,
  • Abeer M. Alkhaibari,
  • Lobna R. Amin,
  • Fatma H. Galal

摘要

The fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is a globally significant agricultural pest capable of devastating cereal crops and other economically important plants. The present study investigates the in vitro inhibitory effects of copper(II) sulfate (CuSO₄), ethylenediaminetetraacetic acid (EDTA), and sodium chloride (NaCl) on key carbohydrate-digesting enzymes in the fourth instar of S. frugiperda, with a particular emphasis on invertase. Enzyme activity profiling revealed that invertase dominates carbohydrate metabolism in adults, while trehalase and amylase are more active in larvae. CuSO₄ exhibited the strongest inhibition, completely suppressing invertase, trehalase, and amylase activity at 0.5 M (P < 0.01), with significant dose-dependent suppression evident even at 0.01 M. EDTA exerted significant but less potent inhibition, reducing enzyme activities by approximately 24–38% at 0.5 M (P < 0.01). NaCl showed negligible inhibitory effects across all tested concentrations (0.1–2.0 M; P > 0.05 at ≤ 0.1 M for amylase). Notably, CuSO₄ inhibition was rapid, requiring less than two minutes to achieve near-complete suppression at 25 °C, and was significantly influenced by temperature. The strong inhibitory effect of CuSO₄ suggests that it disrupts key metabolic pathways in S. frugiperda, likely through protein denaturation and metal ion interference. These findings highlight the potential of CuSO₄ as a biochemical disruptor that could be further explored as a novel pest control strategy. Future research should focus on in vivo assessments of CuSO₄ toxicity, its interactions with insect physiological processes, and its potential integration into sustainable pest management programs.