Vector Control

  1. Vector Control
  2. Spray Reports

Spray Reports

Treatment Information

Dates of mosquito control treatments are subject to change and are based on multiple factors including weather and mosquito abundance. Advance notification of the week a treatment may occur is provided to the public via this page, our Facebook page, and to the media.

Spray Notices and Reports

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

Adulticide – Trenton & Ray – 8/5/2021

Posted on August 3, 2021

The Williston Vector Control District is tentatively scheduled to conduct ground adulticide treatments for the Ray and Trenton spray blocks on Thursday, August 5th. Please keep a distance of at least 300 ft while the trucks are spraying. All treatments will take place near sunset, weather and conditions permitting. Specific treatment dates and locations will...
Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

Adulticide – Williston, Epping, Springbrook & Grenora – 7/29 – 7/31/2021

Posted on July 27, 2021

UPDATE 7/30/2021 @ 11 am: Williston Vector Control will conduct a ground adulticide treatment in Grenora on Friday, July 30th near sunset. Please keep a distance of at least 300 feet behind Vector Control trucks while spraying. UPDATE 7/29/2021 @ 3:15 pm: Williston Vector Control will proceed this evening near sunset with the aerial adulticide...
Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

Adulticide – Williston & Grenora – 7/21 – 7/25/2021

Posted on July 21, 2021

UPDATE 7/23 @ 6 pm: Williston Vector Control will be able to proceed with aerial and ground treatments this evening near sunset. Aerial: Williston spray blocks 7, 11, 13, and 14 and the City of Grenora Ground: Williston spray blocks 1 - 6 Please remember to keep a distance of at least 300 feet from the...

Adulticide – Williston, Ray & Grenora – 7/14-7/16/2021

Posted on July 13, 2021

The Williston Vector Control District is tentatively scheduled to conduct aerial adulticide treatments for the cities of Ray and Grenora on Wednesday, July 14th with back-up dates of Thursday, July 15th or Friday, July 16th. The U.S. Air Force Reserve is tentatively scheduled to conduct an aerial adulticide treatment for Williston Spray Blocks 1 –...

Adulticide – Williston, Ray & Grenora – 7/8 – 7/11/2021

Posted on July 9, 2021

Updated 7/9/2021 The Williston Vector Control District will be conducting adulticide treatments this week between July 8th and July 11th as follows: July 8: Ground - Grenora & Ray July 9: Ground - Williston Blocks 1 – 6 July 9: Aerial - Williston Blocks 8 - 10 All treatments will take place near sunset, weather...
Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

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

Posted on July 3, 2021

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:...
Notice of aerial adulticide campaign with image showing a mosquito crossed out

Adulticide – Spray Blocks 1 – 7 and 12 – 6/24/2021 or 6/25/2021

Posted on June 23, 2021

UPDATE 6/25/2021 @ 2 pm: The Williston Vector Control District will proceed with conducting an aerial adulticide treatment tonight in Williston for Spray Blocks 1 - 7 and 12. Weather permitting, the treatment will occur near sunset.   The Williston Vector Control District will be conducting aerial adulticide treatments on Thursday, June 24th or Friday,...
Close window