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Efficiency of Spinosad in Oviposition Traps for Monitoring Arboviruses Vectors

Background dengue, chikungunya and Zika are vector borne diseases widely spread throughout the world affecting millions of people with Aedes spp. as the main vectors. Currently, vector control remains the most effective method for preventing diseases, particularly carried out with chemical pesticides leading to insecticide resistance in most mosquito populations’ worldwide objective. We evaluated the larvicidal activity and persistence of tablet formulation of the biolarvicide spinosad (NatularTM DT) in ovitraps placed in shade and sunny environments, which established the basis for monitoring. Furthermore, the influence of spinosad on the choice of trap as an oviposition site and the potential of inhibition of hatchability in eggs were assessed methods. Three concentrations 0.21, 0.43 and 0.87 g/L-were used in ovitraps installed and surveyed weekly for immatures results. Spinosad provided 8-17 weeks of control of Aedes spp. larvae. Ovitrap colonization (>90%) and egg density were recorded, indicating no repellent effect of the spinosad conclusion. The results provide evidence that the spinosad tablet formulation has a high persistence and larvicidal activity, particularly under unshaded conditions. Furthermore, the product does not interfere with the choice of the ovitrap as oviposition site by Aedes spp. female and may be indicated as an alternative for use in ovitraps.