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<p>The study investigates the potential of <i>Plectranthus amboinicus</i> essential oil as a natural alternative to synthetic insecticides for controlling the rice weevil (<i>Sitophilus oryzae</i>), a major pest in stored grains. Gas Chromatography-Mass Spectrometry (GC-MS) analysis revealed that the oil contains high concentrations of bioactive compounds such as carvacrol, caryophyllene, γ-terpinene, o-cymene, and caryophyllene oxide, which are likely responsible for its insecticidal effects. The fumigant activity of the oil showed considerable efficacy, with lethal concentration (LC<sub>50</sub>) values of 48.28 µL L<sup>−1</sup> after 24&#xa0;h and 20.16 µL L<sup>−1</sup> after 48&#xa0;h of exposure, demonstrating its potency in killing <i>S. oryzae</i>. Additionally, contact toxicity tests revealed LC<sub>50</sub> values of 6.76 µL/cm<sup>2</sup> at 24&#xa0;h and 3.54 µL/cm<sup>2</sup> at 48&#xa0;h, indicating moderate effectiveness when applied directly. Probit analysis and other statistical methods were employed to determine LC<sub>50</sub> values and dose-response relationships. While the results suggest the potential of <i>P. amboinicus</i> oil as a natural pest control agent, further studies are needed to refine its application and evaluate its feasibility within integrated pest management systems.</p>

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Chemical and biological investigation of Plectranthus amboinicus essential oil in the control of Sitophilus oryzae L

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Rajashekar Yallappa,
  • Krishnaiah Hullukere Eraiah,
  • Chikkarasanahalli Shivegowda Vivek Babu

摘要

The study investigates the potential of Plectranthus amboinicus essential oil as a natural alternative to synthetic insecticides for controlling the rice weevil (Sitophilus oryzae), a major pest in stored grains. Gas Chromatography-Mass Spectrometry (GC-MS) analysis revealed that the oil contains high concentrations of bioactive compounds such as carvacrol, caryophyllene, γ-terpinene, o-cymene, and caryophyllene oxide, which are likely responsible for its insecticidal effects. The fumigant activity of the oil showed considerable efficacy, with lethal concentration (LC50) values of 48.28 µL L−1 after 24 h and 20.16 µL L−1 after 48 h of exposure, demonstrating its potency in killing S. oryzae. Additionally, contact toxicity tests revealed LC50 values of 6.76 µL/cm2 at 24 h and 3.54 µL/cm2 at 48 h, indicating moderate effectiveness when applied directly. Probit analysis and other statistical methods were employed to determine LC50 values and dose-response relationships. While the results suggest the potential of P. amboinicus oil as a natural pest control agent, further studies are needed to refine its application and evaluate its feasibility within integrated pest management systems.