Adult Mosquito Spray Calendar September 2025 31 1 2Aerial (plane) Spraying for Adult Mosquitoes; Grandview, Prosser, and West Richland 3 4 5 6 7 8 9Ground Based (Truck) Spraying for Adult Mosquitoes; Benton City, Richland, and West Richland 10 11 12 13Aerial (plane) Spraying for Adult Mosquitoes; Grandview, Prosser, and Richland 14 15 16Ground Based (Truck) Spraying for Adult Mosquitoes; Benton City and West Richland 17 18 19 20 21 22 23 24Ground Based (Truck) Spraying for Adult Mosquitoes; West Richland 25 26 27 28 29 30 1 2 3 4
