Utah Mosquitoes 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. West Nile Virus Tested Positive In Utah Mosquitoes By Hailey Hendricks • Jul 6, 2017 KQUED.org Listen Listening... / 1:39 Mosquito abatement centers across the state of Utah have been trapping and testing mosquitoes for West Nile Virus throughout the months of June and July and officials said a pool of mosquitoes in Draper was the first to test positive.