Susceptibility status to temephos in larval Aedes aegypti and Aedes albopictus (Diptera: Culicidae) populations from Quintana Roo, southeastern Mexico
Abstract
In Mexico, the larvicide temephos (an organophosphate) has been used widely for vector control for a number of yr. Repeated exposure to this larvicide has caused resistance in Aedes container-inhabiting larvae. In this study, the susceptibility status to temephos was evaluated in Ae. albopictus and Ae. aegypti larvae from 4 locales within Quintana Roo, Mexico. Aedes aegypti exhibited low-intensity phenotypic resistance in Cancún, Playa del Carmen, José María Morelos, and Chetumal. Aedes albopictus was found to be susceptible to temephos in Chetumal and Playa del Carmen, but low-intensity phenotypic resistance (tolerance) was observed in Cancún and José María Morelos. The changes in susceptibility status to temephos in both species could be caused by different degrees of exposure to this larvicide. However, more in-depth studies are required to confirm this.
Sumario
En México, el larvicida temefos (organofosforado) se ha utilizado ampliamente para el control de vectores durante varios años. La exposición prolongada a este compuesto ha provocado resistencia en las larvas del género Aedes. En este estudio, el estado de la susceptibilidad a temefos fue evaluado en larvas de Ae. albopictus y Ae. aegypti de cuatro comunidades de Quintana Roo, México. Aedes aegypti mostró una resistencia fenotípica de baja intensidad en Cancún, Playa del Carmen, José María Morelos, y Chetumal. Por otro lado, las poblaciones de Ae. albopictus de Chetumal y Playa del Carmen fueron susceptibles al larvicida, sin embargo, se observó resistencia fenotípica de baja intensidad en Cancún y José María Morelos. Los cambios en el estado de susceptibilidad a temefos de ambas especies puede deberse a los diferentes niveles de exposición al larvicida, sin embargo, se requiere de estudios más profundos para confirmarlo.
Key Words: organophosphate; dengue; arbovirus; vector; larvicide
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