Susceptibility status to temephos in larval Aedes aegypti and Aedes albopictus (Diptera: Culicidae) populations from Quintana Roo, southeastern Mexico

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 Cancun, Playa del Carmen, Jose Maria 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 Cancun and Jose Maria 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.