Larvicidal activity of coconut fatty alcohol sulfate (CFAS) on Aedes (Stegomyia) aegypti (Linnaeus 1762)
2009
Mesolania, R.L.. Patricio, M.G.D.C., Philippines Univ. Los Baños, College 4031, Laguna (Philippines). Dept. of Veterinary Paraclinical Sciences | Librojo-Basilio, N.T., Philippines Univ. Los Baños, College, Laguna (Philippines). Inst. of Chemistry | Bravo, M.V.A., Ecosystems Research and Development Bureau. Dept. of Environment and Natural Resources, College, Laguna (Philippines)
Mosquito control which primarily uses insecticides, is being plagued by problems consisting of insecticide resistance and environmental effects. Thus, there is a need to find alternatives to chemical insecticides, hence this study. This laboratory experiment aimed to evaluate the larvicidal activity of coconut fatty alcohol sulfate (CFAS) on Aedes (Stegomyia) aegyptis (Linnaeus 1762) in terms of the effects of increasing CFAS concentration and CFAS exposure time on larval mortality rates and determining the LDsub50 of CFAS. Six to seven day old larvae were subjected to 0, 1, 10, 100, 500 and 1000 ppm CFAS concentrations for 24 hr in the toxicity range finding test followed by the actual assay, the acute toxicity test. The latter exposed the larvae to CFAS concentrations of 0, 25, 50, 100, 200, 300, 400 and 500 ppm for 24 hr. The results showed that an increase in concentration and exposure time to CFAS resulted to an increase in mortality rates and a 6 to 7 hr LDsub50 of 200 ppm. Thus, CFAS can hinder larval growth and at the right dose can be a potential, alternative control agent for mosquitoes.
显示更多 [+] 显示较少 [-]