The City of Devils Lake Sprays for Mosquitoes In order to spray, wind speed cannot be greater than 10 mph and temperature must be at least 55°F. Aerial spraying for mosquitoes will be done for the 4th of July and Labor Day holidays if deemed necessary. The City also uses larvicide briquettes and granules at breeding sites to help prevent mosquito hatches. Help control mosquitoes and don't let YOUR yard become a breeding site. Get rid of any items that hold standing water! The City of Devils Lake Sprays for Mosquitoes In order to spray , wind speed cannot be greater than 10 mph and temperature must be at least 55 ° F . Aerial spraying for mosquitoes will be done for the 4th of July and Labor Day holidays if deemed necessary . The City also uses larvicide briquettes and granules at breeding sites to help prevent mosquito hatches . Help control mosquitoes and don't let YOUR yard become a breeding site . Get rid of any items that hold standing water !