The Williston Vector Control District is tentatively scheduled to conduct aerial and ground adulticide treatments across the entire District this week.

The spray blocks will include Williston, Trenton, Ray, Epping, and Grenora, between Thursday, June 29 and Thursday, July 6. Treatments will take place near sunset, weather and conditions permitting. Citizens are reminded to please stay at least 300 feet away from a Vector Control truck while it is fogging. Updates, as they are available, will be posted online at

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. 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.

For more information about Vector Control, visit

Here are some things you can do to keep mosquitos and other flying pests away.


  • Use Mosquito Repellents: Apply insect repellents containing DEET, picaridin, or oil of lemon eucalyptus to exposed skin and clothing to repel mosquitoes. Follow the instructions on the product label and reapply as necessary.
  • Eliminate Standing Water: Mosquitoes breed in stagnant water, so remove any sources of standing water around your home, such as empty containers, buckets, and clogged gutters. Change the water in birdbaths and pet bowls regularly.
  • Wear Protective Clothing: When spending time outdoors in mosquito-prone areas, wear long-sleeved shirts, long pants, socks, and closed-toe shoes to minimize exposed skin. Consider wearing light-colored clothing as mosquitoes are attracted to dark colors.
  • Install Window and Door Screens: Make sure all windows and doors in your home have intact screens without any holes or tears. This helps keep mosquitoes from entering your living spaces while allowing fresh air to circulate.
  • Avoid Peak Mosquito Activity Times: Mosquitoes are most active during dawn and dusk. Limit outdoor activities during these times or take extra precautions, such as applying mosquito repellent and wearing protective clothing, to reduce your risk of mosquito bites.


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