Adult Aedes aegypti were confined to screen cages for knockdown evaluations and treated leaf surfaces for residual evaluations of Microcare® (synergized pyrethrins), Cykick® (cyfluthrin) alone and in combination. Ginger plants were treated and aged outdoors under natural field conditions to evaluate efficacy against adult mosquitoes resting on treated vegetation for up to 91 days after treatment. Evaluations were conducted from March through July 2003 in central California.

Direct application of Microcare® (synergized pyrethrins) alone and in combination with Cykick® (cyfluthrin) to adult Aedes aegypti yielded 100% knockdown and mortality within 1-hour and after 24-hours post-treatment at all dosage rates evaluated. The combination of Cykick® to the Microcare® treatments provided consistently high (97.2 - 100%) residual efficacy for the entire 28-day evaluation. Direct application of Cykick® (cyfluthrin) to adult Aedes aegypti yielded 100% knockdown and mortality within 1-hour and after 24-hours post-treatment at both dosage rates evaluated. Cykick® (cyfluthrin diluted to 0.5 and 1.0 oz/gal) demonstrated 100% mortality of adult Aedes aegypti when applied to the upper and lower leaf surfaces and aged outdoors for 59 days. Residual efficacy declined in the 0.5 oz/gal treatment group (86.6 - 94.0%) on test day 91, but the 1.0 oz/gal treatment group remained at 100% mortality. These data indicate the utility of residual insecticide applications to plants within landscapes controlling resting mosquito populations in proximity to human activities.