ROSEVILLE, Calif. – The return of warmer temperatures along with seasonal mosquito behavior in agricultural areas create ongoing mosquito problems in areas of North Lincoln and West Roseville. The Placer Mosquito and Vector Control District plans to respond with ground-based mosquito treatments scheduled for October 13th.

Just when we thought the warmer days of late summer were behind us, another spell of warm weather returns to Placer County, bringing along high mosquito activity. Mosquito traps, as well as reports from residents, suggest that the mosquito season is not quite over for Western Placer County. The District’s mosquito management plan includes providing treatment when mosquito populations have exceeded threshold numbers, posing a risk for vector-borne disease, which is the case this week.

The District has scheduled ground-based adult mosquito treatments for the early morning of October 13th in the following areas of West Placer:


  • Residential areas north of Nicolaus Rd and south of Nicolaus Road to Third St, including areas east of Waverly Drive to P street.
  • Residential areas south of the Lincoln airport

West Roseville:

  • West of Fiddyment Road, from Hayden Pkwy. in the north to Pleasant Grove in the south, including residential areas south of Pleasant Grove and west of Fiddyment.
  • Crocker Ranch Subdivision, north of Blue Oaks Blvd.
  • Amoruso Way and sidestreets

Since several factors affect spraying activities, such as weather and wind conditions, the District encourages Placer residents to check the District website at for any changes to the spraying schedule.

With West Nile virus spreading to more populated areas of the county, the Placer Mosquito and Vector Control District advises the public to implement the 3 Ds of protection:

Drain any standing water that may produce mosquitoes.
Defend yourself and your home by using an effective insect repellent, dressing protectively when
outside, and making sure screens on doors and windows are in good condition.
• Contact the District for any additional help controlling mosquitoes around your home, or to report potential mosquito breeding sources, such as neglected swimming pools.

For more information, Placer County residents may contact the Placer Mosquito and Vector Control District at (888) 768-2343 or

2010 Placer County West Nile virus activity update:

7 dead birds, 3 sentinel chickens, 34 mosquito samples, and 3 humans have tested positive for West Nile Virus to date.

Contact: Ada Barros, Public Information Officer