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Insecticidal properties of essential plant oils against the mosquito Culex pipiens molestus (Diptera: Culicidae)

Traboulsi, Abdallah F., Taoubi, K., El-Haj, Samih, Bessiere, J.M., Rammal, Salma
Pest management science 2002 v.58 no.5 pp. 491-495
Culex pipiens form molestus, Lavandula stoechas, Mentha, Myrtus communis, Origanum, Pistacia lentiscus, carvacrol, cineole, essential oil crops, essential oils, extracts, flowers, insect larvae, insecticidal properties, leaves, lethal concentration 50, linalool, menthone, pest management, plant fats and oils, terpineol, thymol, toxicity
The insecticidal activities of essential oil extracts from leaves and flowers of aromatic plants against fourth-instar larvae of the mosquito Culex pipiens molestus Forskal were determined. Extracts of Myrtus communis L were found to be the most toxic, followed by those of Origanum syriacum L, Mentha microcorphylla Koch, Pistacia lentiscus L and Lavandula stoechas L with LC50 values of 16, 36, 39, 70 and 89 mg litre−1, respectively. Over 20 major components were identified in extracts from each plant species. Eight pure components (1,8-cineole, menthone, linalool, terpineol, carvacrol, thymol, (1S)-(−)-α-pinene and (1R)-(+)-α-pinene) were tested against the larvae. Thymol, carvacrol, (1R)-(+)-α-pinene and (1S)-(−)-α-pinene were the most toxic (LC50 = 36–49 mg litre−1), while menthone, 1,8-cineole, linalool and terpineol (LC50 = 156–194 mg litre−1) were less toxic.