The Washoe County Health District Vector-Borne Diseases Program will conduct its third seasonal helicopter larviciding application this morning. The larviciding will cover the Silver Lake, Swan Lake, Lemmon Valley, Kiley Ranch, Red Hawk, Rosewood Lakes, Butler Ranch, South Meadows, Damonte Ranch, and Washoe Valley areas to prevent mosquito hatching over approximately 800 acres. The applications will consist of Vectolex, a biological larvicide that only targets mosquito larvae, with no affect to humans, fish, water fowl or other beneficial insects such as bees. Halting the growth of biting mosquitos can also prevent the spread of arboviruses like West Nile Virus (WNV), a virus most commonly spread to people by mosquito bites.