BARRIER TREATMENTS USING COMBINED LAMBDA-CYHALOTHRIN AND PYRIPROXYFEN REDUCE PERIDOMESTIC AEDES MOSQUITOES IN A SUBTROPICAL ENVIRONMENT

Barrier treatment of vegetation using lambda-cyhalothrin has been shown to be effective at reducing adult mosquito populations in the US. However, recent investigations have indicated that standard residual adulticide barrier treatments may be enhanced when combined with an insect growth regulator targeting immature stages that could be transferred to immature habitat by adults contacting treated surfaces. We conducted field trials at residential sites in a subtropical urban environment in north central Florida treating blocks of vegetation with residual sprays of lambda-cyhalothrin (Demand® CS) and pyriproxyfen (Archer®) alone and in combination treatments to determine their efficacy against peridomestic mosquitoes. The combined treatment resulted in consistent approximately 100% reduction in Aedes mosquito eggs for 16 wk post-treatment compared to not significantly lower but more variable reductions at alone treatment sites.