Evaluation of Larvicidal Activity of Kaempferia galanga Extracts Against Aedes aegypti Larvae

Abstract

Background and Objective: The resistance of Aedes aegypti larvae against temephos become an obstacle in controlling the arboviral vector. This condition triggered researchers to investigate the larvicidal activity of phytochemical compounds that are effective, safe, biodegradable and eco-friendly from various medicinal plants. This study evaluated the larvicidal activity of Kaempferia galanga extracts against Ae. aegypti larvae. Materials and Methods: Four solvents with different polarities, namely ethanol, ethyl acetate, n-hexane and water were used in the sequential extraction. The final larvicidal bioassay test of the four extract types was designed in five replicates of five concentration ranges, namely 1.0, 8.75, 17.5, 35.0 and 70.0 ppm. A total of 20 3rd instar larvae of Ae. aegypti were contacted with each replicate in a plastic cup. Larval mortality and effective concentration of larvicide were calculated and determined after 24 and 48 hrs of exposure. Results: The average range of larval mortality according to the concentration of larvicide extracts of ethanol, ethyl