Mosquito & Chemical Application Hotline (307) 721-5056

Updated Friday July 1st, 2022 @ 3:21 PM (Final update for the day will be done by 4:15 pm.)


West Nile Virus Risk: Level 1 (Low Risk)

Adult Mosquito Fogging:  

All fogging's are weather dependent as required by label and department procedures. Fogging routes may be suspended for the evening if conditions are not met. Weather will be assed at 8:00pm, +/- 30 mins, to determine if routes will be suspended and updated on the website. 

Location: West and Northern Perimeter (July 3rd)

                                                       ****No Fogging On July 4th**** 

Additionally parks, Jacoby Golf Course and the Greenbelt pathways are treated nightly Sunday through Thursday.

Time: Routes will begin at roughly 8:30pm

Chemical: Zenivex E4 

Center for Disease Control (CDC) : What You Need to Know About Truck Spraying

West Nile virus (WNV) Surveillance Update: In 2022, zero (0) mosquito pools have been tested so far. Zero (0) mosquito pools have tested positive for West Nile virus this season. 

In 2021, one hundred and twelve (112) mosquito pools had been tested. Four (4) mosquito pools had tested positive for West Nile virus during the 2021 season. 

Larval Mosquito Control: 

Mosquito Control will be applying larvicide to control larval mosquitoes in irrigated and wetland areas in and around Laramie on a daily basis throughout the spring and summer seasons.

Larvicides include: 

  • Bacillus thuringensis israelensis (Bti)- is a bacteria used as a biological control agent for the larval stage of certain dipterans such as mosquitos, fungus gnats, and blackflies.
  • Methoprene- is an insect juvenile hormone analog which as a growth regulator.
    • Used in limited areas
  • BVA 2 Mosquito Larvicide Oil- When applied evenly over the water surface it rapidly interrupts the air/water interface and suffocates larvae and pupae
    • Used only in areas where Vector and Nuisance mosquito populations pose a public threat and are outside of the control window of Bti


Noxious Weeds: 









Applications will begin at 5:00AM

All applications are on a weather permitting basis.

Hotline information regarding chemical applications on city owned properties will be updated daily at 4:00 PM. Call 721-5056 or click on the Mosquito and Chemical Application Hotline tab on the City of Laramie home page. 

All applications are on a weather permitting basis.