Abstract

AMARILES-BARRERA, SANTIAGO; GARCIA-PAJON, CARLOS MARIO  and  PARRA-HENAO, GABRIEL. Insecticidal activity of vegetal extracts against Aedes aegypti larvae, Diptera: Culicidae. CES Med. [online]. 2013, vol.27, n.2, pp.193-203. ISSN 0120-8705.

Introduction: Given the increasingly frequent occurrence of resistance of Ae. aegypti to conventional insecticides, it becomes necessary to study plant extracts that can be used as alternative for control. Objective: To establish the insecticidal activity of metanolic extracts of Gliricidia sepium, Sapindus saponaria and Annona muricata against third instar Ae. aegypti larvae. Materials and methods: A percolation with methanol of macerated plant species to obtain total extracts was performed and then using dilutions of each extract was proceeded to perform bioassays on third stage larvae of Ae. aegypti, strains Rockefeller and wildtype. PROBIT analysis was performed to determine the median lethal concentration (LC50) of the extracts tested. Results: LC50 values found for each of extract are: A. muricata, 6,48 ppm (CI 95 %: 5,88 - 7,27); S. saponaria, 601,81 ppm (CI 95 %: 498,41 - 690,74); G. sepium, 1 328,91 ppm (CI 95 %: 1 201,45 - 1 448,70), Rockefeller strain. A. muricata, 7,26 ppm (CI 95 %: 6,65 - 8,05); S. saponaria, 658,64 ppm (CI 95 %: 591,48 -730,05); G. sepium, 1 532,89 ppm (CI 95 %: 1 408,15 - 1 660,70), for wildtype strain. Conclusion: The results are promising for the control of immature stages of Ae. aegypti

Keywords : Ae. aegypti; Bioassay; Vector contro; Dengue; Vegetal extracts.

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