Mosquito Control Program

Mosquito Control Program Town Hall Meeting, 2022.

Residents in the communities of Duncan Dam, Meadow Creek, Cooper Creek, and Pineridge subdivision - You are invited to participate in this forum. If you have further inquiries or questions please contact us at 250-352-8161.

Virtual Town Hall Dates and Details

Virtual Meeting Link:

Meeting Number (Access Code): 245 240 67383, Meeting Password: ZBg5qpcRM33

Tap to join from a mobile device (attendees only) 
+1-604-449-3026,,24524067383## Canada Toll (Vancouver) 
+1-587-404-3573,,24524067383## Canada Toll (Edmonton) 

Join by phone 
+1-604-449-3026 Canada Toll (Vancouver) 
+1-587-404-3573 Canada Toll (Edmonton)  

Aerial Application Scheduled - June 6, 2021

There is a scheduled aerial application of Bacillus thuringiensis israelensis (Bti) granules to the Portion of Electoral Area D mosquito Control Service Area, probable to occur Sunday June 6, 2021; if for any reason the application is not able to commence, Monday, June 7, 2021 is the most probable back-up date. 

Some properties have indicated no flyovers, and the pilot has been directed as such.  The aerial application will likely start at the head of the lake and move north.

Morrow BioScience Ltd. (MBL) June 2021 Updates

Mosquito season is upon us again. Within Meadow Creek and Pine Ridge, mosquito eggs laid in previous years along the banks and seepage sites of the Lardeau River (below Duncan Dam) and Kootenay Lake are hatching with the rising waters. Floodwater mosquitoes are triggered to hatch in the presence of water, typically from the freshet, and when the weather starts warming up.

Morrow BioScience Ltd. (MBL), the mosquito control contractor for the Regional District of Central Kootenay (Meadow Creek, Pine Ridge Program), has been conducting mosquito control within BC for over 40 years, and for over 20 years within the Meadow Creek and Pine Ridge region.

Residents may notice mosquito control contractors in brightly coloured vests sampling the flood and seepage waters for mosquito larvae – the targeted life stage for mosquito control. Once the mosquito eggs have hatched and the larvae have started to develop, mosquito control contractors apply a bacterial larvicide to the seepage water to kill the larvae. The larvicide is made up of bacterial spores targeting mosquitoes. When the mosquito eats the bacteria, it dies quickly. Mosquito development sites within the service areas will be monitored once or twice weekly through early August.

Mosquito control contractors have been applying the bacterial larvicide by ground since mid-May. Weather permitting, helicopter treatments will likely occur during the week of June 7-11. Both aerial and ground treatments may continue into August, as dictated by environmental conditions necessary for floodwater mosquito development. Because the larvicide is not toxic to people, wildlife, or pets, there are no safety restrictions following treatments.

We are doing our very best to reduce floodwater mosquitoes in your area. There are additional ways that residents can reduce container mosquito breeding sites around their properties. To reduce mosquito habitats, please remove or refresh standing water daily. These areas include bird baths, old tires, clogged gutters, animal troughs, and kiddy pools, to name a few. We also encourage residents to reduce their exposure to mosquito bites through personal protective measures such as wearing long-sleeved shirts and pants, choosing light-coloured clothing, using insect repellent, deploying mosquito netting at home, and ensuring window screens are properly installed and maintained.

To report standing water or adult mosquito nuisance, please email the Mosquito Hotline: or call the numbers listed below.

Visit MBL's website to learn more about mosquitoes, read Frequently Asked Questions and access their blog.

2021 Pest Management Program Application Information for Pest Management Plan Number RDCK-PMP-2021/2026

The RDCK is renewing a Pest Management Plan and will submit the plan for approval under the Integrated Pest Management Act. This Plan will describe a Mosquito Control Program using Integrated Pest Management, including the use of insecticides.

Purpose:  Mosquito Control for the purpose of nuisance control.
Application Method: Treatment of mosquito larval development sites by hand and aerial application.
Location:  The areas to be included in this Pest Management Plan (PMP) application are limited to public and private lands within the following existing program areas:

  • The floodplain area below the Duncan Dam between the south end of Duncan Lake and the north end of Kootenay Lake. Within this floodplain are the following communities:  Duncan Dam, Meadow Creek and Cooper Creek.
  • Within the boundary of the RDCK Bylaw 1642 for the Pineridge subdivision area.

Pesticide:  Yearly totals up to, but not exceeding:

  • 1,000 ha with Aquabac (PCP No. 26863) (Bacillus thuringiensis var israeliensis)
  • 1,000 ha with Aquabac XT (PCP No. 26860) (Bacillus thuringiensis var israeliensis)
  • 1,000 ha with Aquabac 200 G (PCP No. 19466) (Bacillus thuringiensis var israeliensis)

A selection of insecticides has been chosen to increase the ability to target mosquito populations in the most environmentally responsible method possible. All products listed are registered in Canada for the intended use. Bacillus thuringiensis var israeliensis has been chosen to control larval mosquitoes in their development sites.  These pesticides are target specific, non-residual, and non-toxic.

The RDCK will not treat the total area of all the products listed above but will choose the best method to treat with the least environmental impact.  All products are registered for mosquito control in Canada.

This project will begin April 30, 2021 and be completed by April 30, 2026.

A person wishing to contribute information about a proposed treatment site, relevant to the development of the pest management plan, may send copies of the information to the applicant at the address below.

Any member of the public wishing to view the application or associated material can do so online or by requesting a digital copy at the contact number below (arrangements can be made if digital access is not possible). If clarification is required regarding this application, please contact the applicant:

Regional District of Central Kootenay
PO Box 590, 202 Lakeside Drive
Nelson, BC   V1L 5R4
Attention:  Todd Johnston
PH:  (250) 352-1523

Report Mosquito Problems - Pineridge and Duncan Dam Areas

Residents covered under the Pineridge Subdivision Area Mosquito Control Service Establishment Bylaw No. 1642 and Portion of Electoral Area D Mosquito Control Extended Service Area Establishment Bylaw No. 1293 can report serious concerns regarding the mosquito program.

During Regular Business Hours:         250-352-1523 / 1-800-268-7325 (Ext. 1523)
(8:30 am - 4:30 pm, Mon - Fri)
After Regular Business Hours:            250-352-1525 / 1-844-313-1913

Residents are encouraged to call during regular business hours for issues that are not time sensitive.  NOTE:  The after hours toll-free number is not always responded to immediately.  Leave a message and we will endeavor to respond the same day.

Since 2001 the RDCK has coordinated a mosquito control program in a portion of Electoral Area D (Duncan Dam) Service Area and the Pineridge Subdivision Service Area.  Detailed information on the Mosquito Control Program.  Here are some simple actions you can take right in your own backyard to help reduce local mosquito populations and make summer a little more comfortable.

The 2021 Final Report prepared by Morrow BioScience summarizes the 2021 mosquito control season. 

The Pre-season Report prepared by Morrow BioScience  provides predictions for the 2022 mosquito season based on current environmental conditions and anticipated climate influences.

The goal of the Program is to minimize the nuisance mosquito population to a tolerable level in the Area D-Duncan Dam and Pineridge Sudivision service areas.  Contracted nuisance control activitied are undertaken in an effort to avoid negative impacts to the local economy and quality of life of our residents which can result from a high nuisance mosquito population.  The RDCK's program is primarliy focused on larval mosquito control through ground and aerial application of biological larvacides, but may also involve additional work related to West Nile Virus surveillance and control.

The content on this page was last updated May 5 2022 at 11:05 AM