Pesticide Spraying in Rock Springs

Rock Springs, WY – The City of Rock Springs will begin spraying for mosquitoes at the city cemetery on Thursday. The spraying is part of the effort to prevent the spread of West Nile virus.

Wyoming saw 185 cases of West Nile virus last year and Sweetwater County had its first reported case.

Crews this week plan to spray a pesticide called "Biomist" that contains permethrin. Officials say the pesticide is based on compounds taken from plants and doesn't pose a significant risk to people or pets.

Officials say that if people see the spray trucks next to their yards that they should go inside with their pets, close the windows and turn off cooling units until the spray dissipates.