Larvicidal Effects of Plant Extract and Bacillus thuringiensis.var israelensis on Aedes aegypti (Diptera: Culicidae)

Abstract

Mosquitoes are the most important group of arthropods that transmits disease causing pathogens. Several plants are used in traditional medicines for the mosquito larvicidal activities in many parts of the world. The use of bacterial toxin in plant extract has a remarkable effect on the larvae of the mosquito. The larvicidal efficacy of plant extract Annona squamosa with B. thuringiensis was tested against third-instar larvae of Aedes aegypti. The mean mortality and percentage mortality of larval populations were noted at different concentrations after 24 and 48 hours period of exposure. Bti and extracts of Annona squamosa showed high insecticidal activity with LC 50 and LC 90. The values of LC 50 at 24 and 48hours exposure are 17.34 and 15.70 respectively. Values of LC 90 at 24 and 48 hours exposure are 31.48 and 28.38 respectively.