Heads up, folks! Tonight, Wednesday, July 2, 2025, between 8:30 PM and midnight, Placer County will be spraying for mosquitoes farther south than I’ve ever seen.
This isn’t just a routine spray. It’s happening because mosquitoes testing positive for West Nile virus have been found, and there are high numbers of adult mosquitoes in the area. The goal of this treatment is to help prevent the West Nile virus from spreading to people.
You’ll see an aircraft flying over, applying an EPA-registered mosquito adulticide. This is done using an ultra-low volume fog, which is a common and effective method for targeting adult mosquitoes.
You might be wondering about the “how.” For a safe and effective application, a lot of factors are considered, like the aircraft, weather conditions, and current mosquito and disease data. Wind speed and direction are especially crucial. The contractors flying these planes use special systems that allow pilots to measure the wind in real-time. This means they might fly “upwind” of the target area to make sure the treatment gets exactly where it needs to go, compensating for the wind.
So, to recap:
- What: Adult mosquito treatment
- Where: Rural areas in Western Placer County
- When: Tonight, Wednesday, July 2, 2025, between 8:30 PM and 12 AM
- Why: West Nile virus positive mosquitoes and high adult mosquito counts