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West Nile Virus

Notice of Pesticide Use for Mosquito Control

Between June 21st and October 31st, 2021, the City of Barrie will be conducting a larviciding program under the authority of the Local Medical Officer of Health to control larval mosquitoes in order to prevent their development into vectors of West Nile Virus. The pellet formulation of Altosid Methoprene Pellets Mosquito Growth Regulator PCP#21809 or the pouch formulation of Vectolex WSP Biological Larvicide PCP#28009 will be placed into municipal owned catch basins of storm drains within the boundaries of the City of Barrie.

All larvicide will be applied by applicators, licensed by the Ministry of the Environment, Conservation and Parks, or their supervised technicians. Municipally owned catch basins on private property will be treated upon request of the homeowner with Altosid XR Briquette PCP#27694. A consent form must be signed by the homeowner prior to treatment. For additional details please call 705-739-4219.

Prior to the commencement of the larviciding program, the City cleans out all catch basins, which ensures that they are free of sediment and water and that the larvicide will remain in place for the appropriate time period and will not be flushed out. Additionally, the contractor does not apply the larvicide during rain events and uses a calibrated dispensing tool to ensure there are no excess amounts of larvicide. These methods prevent the larvicide from being flushed out of the intended catch basins and into the waterway.

What is West Nile Virus?

West Nile Virus is a mosquito-borne virus that can cause illness.  This virus can be spread to humans by the bite of an infected mosquito. Mosquitoes become carriers of the virus when they feed on infected birds. Human infections from the virus are rare and those affected usually experience only mild symptoms such as fever or headaches. The transmission of West Nile Virus can be greatly reduced by eliminating mosquito-breeding sites around your home and property.

What is a Mosquito-Breeding Site?

A mosquito-breeding site is any container, depression, or area containing stagnant water for a period longer than seven days.  Mosquitos lay their eggs in this water and the larva grows and emerges as a mosquito in a few days. By preventing and eliminating breeding sites, adult mosquito numbers can be decreased, which can then reduce your risk of being bitten by a mosquito.

Examples of Mosquito-Breeding Sites

  • Rain barrels
  • Ponds
  • Bird baths
  • Pool covers
  • Boats and or canoes
  • Old tires
  • Lawn equipment and ornaments

What Can I Do?

To eliminate potential breeding sites:

  • Keep grass cut and trim shrubs and bushes
  • Keep swimming pools, spas and hot tubs chlorinated and covered tightly when not in use
  • Change birdbath water weekly
  • Ensure water doesn’t accumulate in tires and tire swings
  • Empty buckets, wheel barrows and pots
  • Store small boats and canoes upside down
  • Be sure boat covers do not accumulate water
  • Keep eavestroughs and rain gutters clean
  • Drain plastic covers on lawn chairs and other outdoor equipment weekly

How to Protect Yourself?

You can help reduce your chance of being bitten by a mosquito by:

  • Wearing long-sleeved shirts and long pants when outdoors
  • Applying a repellent containing DEET sparingly to skin and clothing
  • Making sure all windows and doors in your home have screens that are in good condition


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