Bioefficacy of essential oil from Toddalia asiatica (L.) Lam. against dengue vector mosquitoes Aedes aegypti L. and Aedes albopictus Skuse

Abstract

The present investigation aimed to evaluate the bioefficacy of the essential oil from the leaves of Toddalia asiatica (L.) Lam. against the dengue vector mosquitoes, Aedes aegypti L. and Aedes albopictus Skuse. The essential oil was extracted using Clevenger apparatus and tested at different concentrations (62.5, 125, 250, 500, and 1000 µg/mL) against I, II, III, and IV instar larvae of Ae. aegypti and Ae. albopictus. The larval mortality was recorded after 24 h of treatment. The LC50 values of the essential oil against I, II, III, and IV instar larvae of Ae. aegypti were 29.90, 31.75, 54.70 and 86.63 µg/mL, respectively and LC90 values were 86.00, 110.97, 296.38 and 500.97 µg/mL, respectively. When tested against I, II, III and IV instar larvae of Ae. albopictus, the LC50 values were 31.18, 34.40, 64.24, and 98.52 µg/mL, respectively and the LC90 values were 99.61, 251.03, 383.49, and 542.93 µg/mL, respectively. No mortality was observed in control groups of the two mosquito species. The results suggest that the essential oil of T. asiatica has the potential to be used as an ecofriendly larvicide against Ae. aegypti and Ae. albopictus.