Repellency and toxicity of aromatic plant extracts against the mosquito Culex pipiens molestus (Diptera: Culicidae)

Abstract

The insecticidal activities of essential oil extracts from leaves, flowers and roots of aromatic plants against fourth-instar larvae of the mosquito Culex pipiens molestus Forskal were determined. Extracts of Foeniculum vulgare Mill were the most toxic, followed by those of Ferula hermonis Boiss, Citrus sinensis Osbeck, Pinus pinea L, Laurus nobilis L and Eucalyptus spp with LC50 values of 24.5, 44.0, 60.0, 75.0, 117.0 and 120.0 mg litre(-1), respectively. Combination tests between the LC50 and the maximum sub-lethal concentration (MSLC) were determined. Over 20 major components were identified in extracts from each plant species tested. Five essential oils and nine pure components were studied for their repellency against mosquito bites. Terpineol and 1,8-cineole were the most effective against Culex pipiens molestus bites offering complete protection for 1.6 and 2 h, respectively.

Larvicidal and irritant activities of hexane leaf extracts of Citrus sinensis against dengue vector Aedes aegypti L.

“…Different parts of the Citrus plant i.e. fruits, seeds, roots and leaves have been tested for their use as mosquitocidal components [9,10] . A number of studies have also been carried out on the larvicidal potential of essential oil extracted from the Citrus leaves and peels [11,12] .…”

“…Bagavan et al [16] tested the crude extracts of Citrus peels against mosquito larvae and obtained the LC 50 value of 58.25 ppm and LC 90 value of 298.31 ppm with the chloroform extract of C. sinensis peels against Anopheles subpictus larvae; and the LC 50 value of 38.15 ppm and LC 90 value of 184.67 ppm with the peel methanolic extract against the larvae of Culex tritaeniorhynchus. Traboulsi et al [9] have accounted the insecticidal activity of essential oil extracts from leaves, flowers and roots of C. sinensis Osbeck against fourth instar larvae of the mosquito Culex pipiens molestus Forskal as 60.0 mg/L.…”

“…for their use as mosquitocidal components [9,10] . Amusan et al [5] have tested the ethanolic extracts of the orange peel of Citrus sinensis (C. sinensis) for the toxicity effect on the larvae of the yellow fever mosquito Aedes aegypti (Ae.…”

Repellent properties of Cardiospermum halicacabum Linn. (Family: Sapindaceae) plant leaf extracts against three important vector mosquitoes

“…quinquefasciatus. Traboulsi et al [44] showed that extracts of Foeniculum vulgare leaves were toxic against Culex pipiens larvae, and terpineol and 1,8-cineole were the most effective components in repellency tests. Omolo et al [45] evaluated six plant species growing in the Kenyan coast for repellency on the forearms of human volunteers against Anopheles gambiae.…”

VARIACIÓN ESTACIONAL DE LA REPELENCIA DE LOS ACEITES ESENCIALES DE MONIMIACEAE SOBRE Sitophilus zeamais Motschulsky (CURCULIONIDAE)

“…Sobre 1-8 cineol como compuesto individual, Obeng-Ofori et al (1997) reportaron repelencia contra S. zeamais y S. granarius (L.), mientras Klocke et al (1987) encontraron repelencia sobre A. aegypti. Con aceites esenciales de otras plantas que también tienen 1-8 cineol como componente principal se reportó efecto contra S. zeamais (Ukeh et al, 2009), Culex pipiens molestus L. (Culicidae) (Traboulsi et al, 2005), Neotoxoptera formosana (Takahashi) (Aphididae) (Hori y Komatsu, 1997) y T. castaneum (Wang et al, 2006). Solo L. sempervirens presentó interacción significativa entre la estacionalidad y la concentración, con diferencias estadísticas entre el aceite esencial extraído en verano en las concentraciones de 2 y 4% con los demás tratamientos y estaciones del año (Tabla 4).…”