Chemical profile, insecticidal and repellent activities of four underexplored Moroccan essential oils against Sitophilus oryzae

IF 2.7 2区农林科学 Q1 ENTOMOLOGY

Journal of Stored Products Research Pub Date : 2025-02-01 DOI:10.1016/j.jspr.2025.102552

Mbarek Ouabou , Houssam Annaz , Filippo Maggi , Marta Ferrati , Eleonora Spinozzi , Amal El Amrani

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引用次数: 0

Abstract

This study aims to evaluate the chemical composition and insecticidal and repellent effects of essential oils (EOs) extracted from four underexplored Moroccan plants, i.e., Deverra denudata, Micromeria macrosiphon, Ruta angustifolia, and Thymus riatarum, against the rice weevil Sitophilus oryzae. The chemical composition of the EOs was determined through gas chromatography-mass spectrometry (GC-MS) analysis. Moreover, the insecticidal effect was assessed through fumigant and contact assays, while the repellent effect was evaluated using the area preference assay. Regarding the chemical composition, α-pinene (42.7%) and β-pinene (40.5%) were the major compounds of D. denudata EO, while bornyl acetate (30.2%), borneol (20.4%), and camphor (12.5%) dominated in M. macrosiphon EO. Regarding R. angustifolia EO, 2-undecanone (90.2%) and 2-decanone (7.5%) were identified as the main constituents. Finally, T. riatarum EO was dominated by p-cymene, carvacrol, and borneol in percentages of 26.8, 25.0, and 13.5%, respectively. Regarding the fumigant toxicity, all EOs displayed strong efficacy after 72 h of exposure with LC₅₀ values comprised between 73.9 and 85 μL/L of air, and D. denudata EO appeared to be the most toxic. Regarding the contact toxicity, all EOs exhibited a strong effect, where R. angustifolia EO was the most toxic after 24 h (LC₅₀ of 0.13 μL/insect), and M. macrosiphon after 72 h (LC₅₀ value of 0.08 μL/insect). On the contrary, T. riatarum EO exhibited the highest percentages of repellence (PR of 92%) at the lowest concentration (0.019 μL/cm²) after 30 min, while R. angustifolia EO after 4 h (PR of 90%) at (0.019 μL/cm²). Finally, for the long-term exposure (24 h), T. riatarum exhibited the highest PR of 86 and 94% at 0.019 μL/cm² and 0.156 μL/cm², respectively. Overall, our study has reported for the first time the insecticidal and repellent effects of EOs from the four Moroccan plants against the rice weevil S. oryzae, underscoring their potential as efficient bio-insecticides for the management of stored product pests.

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来源期刊

Journal of Stored Products Research 生物-昆虫学

CiteScore

5.70

自引率

18.50%

发文量

112

审稿时长

45 days

期刊介绍： The Journal of Stored Products Research provides an international medium for the publication of both reviews and original results from laboratory and field studies on the preservation and safety of stored products, notably food stocks, covering storage-related problems from the producer through the supply chain to the consumer. Stored products are characterised by having relatively low moisture content and include raw and semi-processed foods, animal feedstuffs, and a range of other durable items, including materials such as clothing or museum artefacts.