Repellency of Selected Algerian-Origin Essential Oils and Hybrid Formulations Against Two Arbovirus Vectors, Culex pipiens s.l. and Aedes albopictus

Résumé fourni par la source

Mosquitoes are significant public health insects responsible for numerous vector-borne diseases. Injudicious chemical use has developed metabolic and genetic resistance in mosquitoes. This study evaluated the repellent efficacy of five essential oils (EOs) from local plants [Mentha spicata I, Ruta tuberculata, Mentha spicata II, Lavandula latifolia, and L. stoechas]. M. spicata I and R. tuberculata EOs were extracted using Clavenger hydrodistillation. Simultaneously, the remaining EOs were obtained through a local extraction distillation unit. Chemical composition was identified using GC-MS. Repellency was assessed using the arm-in-cage method, by rearing Culex pipiens s.l. and Aedes albopictus in the laboratory. Additionally, mixtures containing 15% DEET, 15% IR3535, 5% vanillin, and 10% M. spicata I EO were tested. Both mosquito species were clearly repelled by all EOs. M. spicata I was most potent at 10% concentration. The complete protection time (CPT) at 10% M. spicata I EO was increased using blended mixtures containing 15% DEET, 15% IR35353, or 5% vanillin. Regional variations in M. spicata EOs were detected. This study may serve as a foundation for cosmetic manufacturers and pest control products. Developing botanical and hybrid (natural and synthetic) formulations could provide strong protection against insect bites, particularly from disease-vector mosquitoes, helping to prevent vector-borne diseases.

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