TNRD – Aerial mosquito control scheduled again for North Thompson

The Thompson-Nicola Regional District (TNRD) Nuisance Mosquito Control program will be administering aerial treatments by low-flying helicopter for nuisance mosquitoes in the coming days in the North Thompson valley.

Weather permitting, work will begin tomorrow (June 4, 2026) in the Birch Island area and move south, covering areas from Birch Island to Kamloops.

If any additional dates and locations are necessary for aerial mosquito treatment applications, further updates will be provided in advance.

Application involves applying Vectobac 200G to areas infested with mosquito larva. Vectobac 200G is an organic water-dispersible granule of a naturally occurring bacterium that is used to control mosquito larvae. It is not harmful to non-target organisms including fish, livestock, or humans.

Vectobac 200G could indirectly affect fish productivity by affecting a food source of mosquito larvae; therefore, only areas that do not support fish populations are suitable for mosquito control. As a result, only areas that are separate from the Thompson River and North Thompson River, or that do not support fish populations, are suitable for larvicide treatment.

Management activities are carried out in accordance with the TNRD’s Mosquito Surveillance and Reduction Pest Management Plan.

About the TNRD’s Nuisance Mosquito Control Program

The TNRD Nuisance Mosquito Reduction Program includes mosquito reduction with organic pesticides, mosquito surveillance, and outreach to the public. The TNRD mosquito reduction program began in 1971. At first, the program consisted solely of aerial applications to control adult populations of mosquitoes. With the advancement of new products such as biological larvicides, which do not harm fish habitats, the program has shifted to an environmentally-safe practice of controlling mosquito larval populations before they emerge as adults.

Nuisance Mosquito Reduction is conducted in the following areas:

• TNRD Electoral Areas “J,” “L,” “M,” “N” (excluding lands adjacent to the Coquihalla Recreation Area), “O,” “P,” and a portion of Electoral Area “A;” and
• Municipalities of Barriere, Chase, Clearwater, Kamloops, Logan Lake, and Sun Peaks.

For more information about this program, visit: tnrd.ca/mosquitoes.

— TNRD

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