CONICET | Buscador de Institutos y Recursos Humanos

The failure of ULV spraying to suppress larval populations has been identified as a common problem in achieving the desired level of control. This is probably the principal cause of the lack of epidemiologically significant control in the long run. Therefore, further development of ULV formulations with improved larvicidal activity on Aedes aegypti is needed as an additional tool for the overall control program for vector mosquitoes. Mixed formulations of larvicides and adulticides could be a new alternative for spatial treatments with a better performance in Ae.aegypti control. A new ULV formulation containing permethrin as adulticide active principle and the IGR pyriproxyfen as larvicide was developed and tested in a field trial in Wanda, a small city in Misiones, at dengue risk. Three study areas were sprayed with permethrin 10%, pyriproxyfen 2% plus permethrin 10% and awas taken as control area. Jars with water containing larvae III/IV and small mesh cages containing adult mosquitoes were located for control. After spraying the jars with larvae and adult cages were taken to the laboratory and mortality/no adult eclosion assessed. Breteau and House Indices were measured before and after the intervention. Ovitraps were located in strategic points of the city. The field results presented in this work point out the excellent performance of the new mixed formulation on Ae. aegypti populations with 100% of larvae mortality but < 1% larvae mortality with permethrin alone.

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