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

Abstract

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.