The Washoe County Health District Vector-Borne Diseases Program will conduct its second seasonal helicopter larviciding application in the early morning hours today (Wed) and Thursday. Subsequent applications are planned for some time in the first two weeks of August and September. The larviciding will cover the Lemmon Valley, Kiley Ranch, Red Hawk, Rosewood Lakes, Butler Ranch, South Meadows, Damonte Ranch, and Washoe Valley areas to prevent mosquito hatching over approximately 3,000 acres. Earlier this month the Washoe County Health District confirmed that a mosquito sample from the South Meadows area tested positive for the presence of West Nile Virus.