Adulticide – Williston and Ray – 6/29 – 7/5/2021

Posted on July 3, 2021


Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

Updated 7/3 @ 1 pm

Mosquito populations across Williams County have been steadily increasing over the past few weeks with the rain we’ve been receiving. The Williston Vector Control District will be conducting aerial and ground adulticide treatments this week between June 29th and July 5th.

At this time, the following treatments have been scheduled:

  • June 29th: Williston Blocks 8 – 10
  • June 30th: City of Ray Block
  • July 1st: City of Williston Blocks 1 – 12 *CANCELLED DUE TO WEATHER CONDITIONS*
  • July 1st (ground only): City of Williston Blocks 13 – 14; areas surrounding Blacktail Dam *CANCELLED DUE TO WEATHER CONDITIONS*
  • July 4th: City of Williston Blocks 1 – 12
  • July 4th (ground only): City of Williston Blocks 13 & 14

Additional treatments may be scheduled depending on trap counts and weather conditions. All treatments will take place near sunset, weather permitting. For more information and a map of the WVCD Spray Blocks, visit the Spray Reports webpage. Stay tuned to our Facebook page and this news post for updates on treatment dates.

Please maintain a distance of at least 300 feet behind Vector Control trucks when they are spraying.

Williston Vector Control uses Zenivex E20 for adult mosquito control treatments (adulticides), which contains the active ingredient Etofenprox. Zenivex E20 is a product approved for use in residential areas by the Environmental Protection Agency (EPA).

To avoid mosquito bites, citizens are advised to take extra precautions when spending time outdoors during the hours of dusk to dawn during the summer months. Wearing long sleeve tight knit shirts and long pants, limiting time outdoors during these times, and using a mosquito repellent such as DEET, Picardin, or oil of lemon eucalyptus are good actions to take to prevent bites. Citizens can help prevent mosquito re-population by eliminating standing water on their property.

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