Toxicity of Ethanolic Extract of Leaves of Calotropis procera Aiton (Ushar) (Gentianales: Apocynaceae) Against the Larvae of Culex quinquefasciatus Say (Diptera: Culicidae)

Abstract

The Calotropis procera plant (Ushar) which is used in this study, is available in nature, and considered as a promising resource of larvicide. The objectives of this study are to evaluate LC_50% and LC_90% values under laboratory condition after exposure (for 24, 48 and 72 hours) of ethanolic extract of C. procera (Ushar) leaves against the larvae of Cx. quinquefasciatus. The LC₅₀ values (50% mortality) were 360 and 198 ppm for 24 and 48 or 72 hours of exposure, respectively. The LC₉₀ values (90% mortality) were estimated to be 881ppm at 24 hours and 479 ppm for 24 and 48 or 72 hours of exposure to C. procera leaves extract.