Mosquito West Nile-Positive Mosquito Found Near Willard Bay By Rachel Hager • Jul 30, 2018 USDA Listen Listening... / 1:39 Listen to the audio version of this story here. Earlier this month, Box Elder Mosquito Abatement monitors in Willard Bay found a West Nile-positive mosquito. West Nile Virus Prevention Requires More Than Spraying For Adult Mosquitoes By Matilyn Mortensen • May 14, 2018 commons.wikimedia.org Listen Listening... / 1:49 Logan City begins spraying for mosquitoes in mid-May. UPR’s Matilyn Mortensen tells us experts say preventing West Nile Virus requires more than just that. In the next week or so, Logan city will start spraying for adult mosquitos. Residents who don’t want their property treated can contact the city to opt out.