Warning of increasing West Nile virus activity, the Sacramento-Yolo Mosquito and Vector Control District has stepped up ground spraying in the region this week.
District officials announced the start of pesticide spraying for mosquitoes on Monday in 11 ZIP codes in the two counties.
The area treated with pesticides was widespread reaching from Antelope in the north to the Arden area.
In Yolo County, both Davis and Woodland were targeted, officials said.
Aerial spraying of pesticides may begin as early as this week, district officials said, and will be dependent on laboratory surveillance results.
If aerial spraying becomes necessary, a map of the specific area will be provided.
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