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Chemical and biological investigation of Plectranthus amboinicus essential oil in the control of Sitophilus oryzae L
Rajashekar, Yallappa and Krishnaiah Hullukere, Eraiah and Chikkarasanahalli Shivegowda, Vivek Babu (2025) Chemical and biological investigation of Plectranthus amboinicus essential oil in the control of Sitophilus oryzae L. Journal of Scientific Reports, 15. pp. 1-8.
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Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Plectranthus amboinicus, essential oil, Sitophilus oryzae L |
| Subjects: | 600 Technology > 03 Agriculture > 05 Insect/Pest Control 600 Technology > 09 Industrial oils, fats, waxes, gases > 03 Essential oils |
| Divisions: | Food Protectants and Infestation Control |
| Depositing User: | Somashekar K S |
| Date Deposited: | 07 Oct 2025 06:27 |
| Last Modified: | 07 Oct 2025 06:27 |
| URI: | http://ir.cftri.res.in/id/eprint/19894 |
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