Abstract

ANTONIO-ARREOLA, Gloria-Elsa  and  SANCHEZ, Daniel. Residual effectiveness of temephos observed in a Mexican southeast city affected by dengue. Rev Cubana Med Trop [online]. 2012, vol.64, n.2, pp.176-186. ISSN 0375-0760.

Objective: to study the effect of water extraction and renewal on the residual action of temephos applied at 1ppm to cement water-storage containers at home. Methods: the study was conducted in two stages: one, determination of the granular temephos effectiveness on wild Aedes aegypti populations in order to set the monitoring baseline; and second, the measurement of the mean rate of water extraction at home and its effect on the residual activity of temephos. Results: the effectiveness of granular temephos was CL₉₅= 0.095 ppm (IC_{95 %}: 0.079-0.118). As average, it was found that 69.2 % of water stored in cement containers was daily used and renewed, which means significant dilution. For the purpose of simplifying the experiments on residual activity, water was extracted and renewed at a rate of 50 % every day for 2 weeks. It was found that temephos effectiveness significantly declined from day 7 on after application. Conclusions: this rate of water extraction under study has an important effect on the residual activity of temephos. If this rate and the CL₉₅ of granular temephos are considered in estimating the dosing, positive effects on the control of Aedes aegypti and more likely on the occurrence of resistance will be attained.

Keywords : Aedes aegypti; temephos; dilution; residual action.

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