Ada County deputy details weed and mosquito control efforts in Eagle

Desiree Keeney, deputy director of Ada County Noxious Weed, Pest and Mosquito, told the Eagle City Council on July 14 that the county’s approach centers on education, landowner responsibility and integrated pest management. "Our mission is to control and eradicate noxious weeds throughout Ada County," Keeney said, citing Idaho statutes that make landowners primarily responsible for control while the county acts as the control authority.

Keeney said the county uses early detection and rapid response (EDRR) to manage new invaders and that teams provide land-management consultations, mapping and complaint response for residents. She reported roughly 4,300 mapped weed points in Eagle and described the yellow star thistle problem in the Eagle Foothills: early finds in 2009 and later, more widespread infestations found in 2013–14 and again during door-to-door checks in 2021. Where landowners applied integrated pest management, the county documented 50–70% reductions on treated properties, she said.

On mosquito control, Keeney described a larvicide-first strategy—about 70–80% of work—and surveillance that the county runs year-round. "In Ada County, since 2022, we have trapped over and identified individually counted over 55,000 mosquitoes," she said, and noted 36 positive West Nile virus pools were recorded, with 2023 the last hot year locally. Keeney outlined notification and opt‑out procedures for adulticide (fogging) operations, said the county may use aerial treatment when outbreaks justify it, and urged residents to remove standing water on private property to reduce backyard breeding sources.

The council asked about a city QR-code reporting effort for yellow star thistle in the foothills; Keeney said staff will follow up with QR-code usage counts and reiterated that hand‑pulling or targeted herbicide and continued monitoring are necessary to prevent rapid spread.