Abstract

VARGAS V, Franklin; CORDOVA P, Ofelia  and  ALVARADO A, Arturo. Determination of resistance to insecticides in Aedes aegypti, Anopheles albimanus y Lutzomyia peruensis in Northern Peru. Rev. perú. med. exp. salud publica [online]. 2006, vol.23, n.4, pp.259-264. ISSN 1726-4634.

Objective: To determine resistance levels to temephos and deltamethrin in native populations of the following insects: Aedes aegypti (La Libertad and Piura), Anopheles albimanus strains (Sullana and Tambogrande), and Lutzomyia spp. (Santiago de Chuco) in Northern Peru. Materials and methods: Bioassays in larvae and adults were performed following the methodology designed by the World Health Organization. B-estearase band visualization in fourth-stage larvae was performed using electrophoresis in a polyacrylamide gel. Results: A. aegypti from Sullana had a 6,84 resistance factor (RF) to temephos, a KDT50 = 107,20 minutes and 70% mortality rate at 24 hours; while the Tambogrande mosquito population had a 5,50 RF, a KDT50 = 98,35, and 80% mortality rate at 24 hours. These results were different from what was found in La Esperanza, El Porvenir, and Tambo de Mora mosquito strains, which were reported as susceptible to temephos. Deltamethrin resistance was reported in A. aegypti and A. albimanus from Piura (Tambogrande and Sullana), differently from La Libertad A. aegypti and Lutzomyia mosquito populations, which were reported as susceptible. B2 estearase was identified with a 0,23 RF in A. aegypti from Sullana. Conclusions: Given that mosquitoes from La Libertad are susceptible to temephos, this agent may still be used for Aedes aegypti vector control; on the contrary, considering observed resistance in Anopheles populations in Sullana and Tambogrande, the use of deltamethrin must be assessed in these areas. Finally, Lutzomyia spp. populations did not show deltamethrin resistance.

Keywords : Aedes aegypti; Anopheles albimanus; Lutzomyia peruensis; Vector control; Insecticide resistance; Peru.

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