Se determinaron los niveles de susceptibilidad y/o resistencia a insecticidas en larvas de Aedes aegypti, colectadas del municipio Playa, durante la etapa intensiva de la campaña contra el mosquito Aedes aegypti en Ciudad de La Habana, en el presente año. En larvas, se encontró alta resistencia a los insecticidas organofosforados fention y temefos y moderada a fenitrotion, también se detectó alta resistencia al carbamato propoxur. Las larvas resultaron susceptibles a clorpirifos, malation y pirimifos metil. Los resultados a través del uso de sinergistas indicaron que las esterasas desempeñan un papel importante en la resistencia detectada a los insecticidas organofosforados, pero no en la resistencia a propoxur, sin embargo, las monoxigenasas intervienen solamente en la resistencia a fenitrotion. Estos mecanismos se encontraron a elevada frecuencia en las larvas de este municipio. Se confirmó el papel de las esterasas en la resistencia a temefos mediante ensayos de inhibición en gel de poliacrilamida.

The levels of susceptibility and/or resistance to inseciticides in Aedes aegypti larvae collected at the municipality of Playa during the intensive campaign against the mosquito Aedes aegypti, in Havana City, in the present year, were determined. In larvae, it was found a high resistance to the organophosphate insecticides phention and temephos and moderate to fenitrothion. A high resistance to propoxur carbamate was also detected. The larvae proved to be susceptible to clorpirifos, malathion and methyl-pyrimifos. The results obtained through the use of sinergists indicated that esterases play an important role in the detected resistance to organophosphate insecticides, but not in the resistance to propoxur. However, the monooxigenases take part only in the resistance to fenitothrion. These mechanisms were found at an alevated frequency in the larvae from this municipality. It was confirmed the role played by esterases in the resistance to temephos by polyacrilamide gel inhibition tests.