Mosquitoes are evolving to survive common backyard sprays

Key Points:

• Mosquitoes in Wake County have rapidly developed genetic resistance to pyrethroids, a common insecticide, with resistance mutations rising from undetectable levels in 2016-2017 to 39% of mosquitoes carrying the mutation by 2023.
• Mosquito control companies like Mosquito Shield use integrated pest management strategies, including alternating insecticides, larvicides, and natural oils, to mitigate resistance, but repeated backyard spraying may still contribute to the problem.
• Pyrethroids remain vital for controlling disease-carrying mosquitoes such as the Asian tiger mosquito, which is expanding its range due to climate change, raising concerns about maintaining effective mosquito control during outbreaks.
• Researchers urge homeowners to adopt multiple mosquito-reduction strategies, such as eliminating standing water and using larvicides, to reduce reliance on pyrethroids and help slow resistance development.
• Ongoing studies aim to understand the extent of resistance, its causes, and whether reducing pyrethroid use could reverse resistance trends, with experts emphasizing early detection as key to preventing widespread insecticide failure.