INSECTICIDE SUSCEPTIBILITY OF AEDES-AEGYPTI AND AEDES-ALBOPICTUS IN THE LOWER RIO-GRANDE VALLEY OF TEXAS AND MEXICO

In response to a potential dengue fever outbreak in south Texas during 1995, the susceptibilities of Aedes aegypti and Aedes albopictus to c ommonly used mosquito adulticides were assessed. Larvae collected from the Lower Rio Grande Valley of Texas and Mexico were reared to adults and tested against susceptible laboratory strains at Texas A&M Univer sity. Resistance ratios at both the LC,, and LC,, rates were all less than 10, indicating that adult populations of both species are still s usceptible to malathion, chlorpyrifos, resmethrin, and permethrin.