To suppress populations of invasive mosquitoes that spread pathogens that cause disease, we are devising methods to improve the sterile insect technique (SIT). SIT involves the release of large excesses of sterile males. Since females mate only once, if the sterile males mate first, this would render the females sterile. We are devising ways to increase the mating competitiveness of sterile males, to improve the efficacy of the sterile insect technique.