Early Friday morning, September 20, 2019, according to Vector Control, due to the detection of West Nile virus activity, the Northwest Mosquito & Vector Control District performed adult mosquito spray treatments. West Nile virus is transmitted to humans through an infected adult mosquito bite. The spray application was scheduled to be conducted between the hours of 3:00am and 5:00am at the following locations; the residential neighborhood located in The City of Eastvale between Sumner Avenue and Harrison Avenue, and the north end of Limonite Avenue however, spraying started at 3:45am and ended around 4:15am.The District treated this area with Aqua-Reslin (EPA Reg. 432-796), which is approved for use in mosquito control by the US EPA. The District has been working hard to use Integrated Pest Management Practices in these areas and the majority of their efforts focuses on preventing mosquito breeding and killing mosquito larvae before they become flying adults. However, due to West Nile virus activity detected, they have decided that adult mosquito control via a truck mounted ground fogger was the best means to control the current mosquito population in this area. The District posted signs a few days before in the areas that were sprayed to inform the public of these activities.