Mosquito activity is expected to decrease as temperatures fall. But the Maricopa County Environmental Services Department will continue to fog and set traps in Phoenix to prevent the spread of the mosquito-borne West Nile Virus.
And as the busy season for mosquitoes winds down, county spokesman Johnny Diloné said at least 500 mosquito traps will be set a week across the county.
Officials examine the traps for one of three conditions: if any of the trapped mosquitoes carry West Nile Virus, if it has more than 30 Culex mosquitoes (which are more likely to carry West Nile Virus), or if there are 300 or more mosquitoes in a trap.
Diloné said if the traps have one or more of these conditions, the county will fog the area. Exterminators fog between midnight and 5 a.m. — when most people are inside and won’t be fully exposed to the Permanone 30-30 and Zenivex E4 chemicals — around a square mile of where they collected the traps. One component of the traps is dry ice, which mimics human breathing and attracts mosquitoes. Read more