Wake County Mosquitoes Build Resistance to Home Sprays, Researchers Say

Researchers in North Carolina report a rapid rise in a genetic mutation linked to pyrethroid resistance in Wake County mosquitoes, with resistance found in 84% of residential blocks by 2023 and still rising in 2025. The finding signals that common backyard sprays may become less effective, prompting pest-control firms to rotate products, use larvicides and growth regulators, and emphasize integrated pest management to curb breeding sites. While resistance is not yet total failure, experts warn it could complicate disease-control efforts if reliance on pyrethroids continues and advocate a multi-pronged approach that targets multiple life stages of mosquitoes.