As the Delta breeze blew gently for the second night in a row, aerial pesticide spraying to combat the mosquito-borne West Nile virus continued Sunday night in Sacramento areas south of the American River.
Meanwhile, Sacramento-Yolo Mosquito Vector Control District officials tentatively scheduled aerial spraying for the northern parts of Citrus Heights later this week.
They also made plans to meet with residents in Yolo County about ground spraying in the cities of Davis and Woodland.
Sunday, the planes took off at 8:20 p.m. and began spraying south of Elk Grove. They were expected to continue working their way north until 1 a.m., covering large swaths of south Sacramento and the central city.
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"The winds are dying down as we go, so things are looking good," Allen Loe, president of Vector Disease Control, the district's contractor for the aerial spraying, said about 10 p.m. Sunday.
Robert Baruffaldi, a meteorologist with the National Weather Service in Sacramento, said winds would speed up slightly tonight but still should not hamper spraying - which is again scheduled for south Sacramento.
Slightly stronger winds are predicted for Tuesday and Wednesday nights.
That's when an area east to Elverta and north to the Placer County border, including northern Citrus Heights, may be sprayed from the air with a chemical cocktail lethal to mosquitoes, according to vector control district general manager David Brown. Whether or not spraying takes place will depend on a trap count of mosquitoes in the area, he said.
Thursday - another night scheduled for possible aerial spraying in Citrus Heights - could see lighter winds.
Sunday was only the second night in more than a week with favorable conditions for aerial spraying south of the river. Until Saturday, the Delta breeze had been too strong for for aerial eradication efforts to continue.
In the meantime, ground spraying with trucks had been taking place in the Pocket area.
Ground spraying is also expected in Davis and Woodland.
Officials said they would hold an informational hearing Tuesday in Davis to discuss spraying in a community where it has been especially controversial.
The meeting is scheduled for 7 p.m. in the community chambers at Davis City Hall.
"We took heat for not giving enough information prior to doing this in Sacramento, so we're doing that for Yolo County," said Brown.
Brown said the district had not scheduled a date for spraying to begin in Davis.
"We don't do it by a date," he said. "We do it by indicators that we need to be treating."
So far, Yolo County's rate of West Nile virus infection among mosquitoes has been far lower than Sacramento County's.
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- The Bee's Hudson Sangree can be reached at (916) 321-1987 or email@example.com.