Tag

Pyrethroids

All articles tagged with #pyrethroids

science1 month ago•10 min saved

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.

via WRAL|

#insecticide-resistance #integrated-pest-management #mosquitoes

science1 month ago•6 min saved

Backyard Sprays May Be Breeding Insecticide-Resistant Mosquitoes in North Carolina

A nine-year study in Wake County, NC found a mutation in Asian tiger mosquitoes (Aedes albopictus) that lets them survive common pyrethroid insecticides; the mutation appeared in 2018 and, by 2023, was spread across the area, with more than a third of relevant gene copies carrying the resistant variant, likely aided by uneven backyard spraying. The findings suggest backyard and private-sector spraying can drive resistance, potentially undermining disease-control tools and calling for coordinated monitoring and management that includes private yards.

via StudyFinds|

#aedes-albopictus #backyard-spraying #insecticide-resistance

science1 month ago•17 min saved

Wealthier neighborhoods may be fueling mosquito resistance to common sprays, study finds

Two NC State studies show backyard spraying by wealthier homeowners in the eastern U.S. is applying selective pressure that has driven rapid evolution of pyrethroid resistance in the invasive Asian tiger mosquito (Aedes albopictus); by 2023, resistance markers appeared in 84% of sampled residential blocks in Wake County, NC, and 39% of mosquitoes carried the resistance mutation. Researchers warn that relying on chemical sprays alone is risky and advocate integrated pest management and community-wide efforts to curb breeding sites, plus practical steps for homeowners to reduce standing water and mosquito habitats.

via The Times of India|

#aedes-albopictus #insecticide-resistance #pyrethroids

health3 years ago•4 min saved

WHO recommends new insecticide-treated nets to prevent zoonotic malaria.

The World Health Organization (WHO) has published new recommendations for two types of insecticide-treated nets (ITNs) to combat malaria. The new ITNs combine pyrethroids with either piperonyl-butoxide (PBO) or an insect growth regulator (IGR) to enhance their effectiveness against pyrethroid-resistant mosquitoes. The WHO recommends the deployment of pyrethroid-chlorfenapyr ITNs over pyrethroid-only nets to prevent malaria in areas with pyrethroid resistance. However, the cost-effectiveness of pyrethroid-pyriproxyfen nets compared to pyrethroid-only nets is a concern. ITNs have contributed significantly to reducing malaria cases worldwide, but threats to their effectiveness include pyrethroid resistance, insufficient coverage, and changing mosquito behavior.

via World Health Organization|

#health #insecticide-treated-nets #malaria