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Water Soldier Control


An inter-agency working group on water soldier was formed in 2008 to help coordinate research, monitoring, control and prevention strategies.

Agency groups include: Ontario Ministry of Natural Resources and Forestry, Ontario Federation of Anglers and Hunters, Ontario Ministry of Environment and Climate Change, Trent University, Lower Trent Conservation, United States Army Engineer Research and Development Center, Parks Canada and Ontario Invasive Plant Council.

September 2015, Pre Herbicide Treatment


July 2016, Post Herbicide Treatment


In October of 2015, Allied Biological treated 146.5 hectares of water solider populations on Lake Seymour. The results of that treatment saw a 36% reduction of water soldier biomass in dense colonies. Most of the success was seen in back bay areas where water flows are minimal. The pictures above are before and after of a large back bay that was treated on the south shores of Lake Seymour.

2016 Monitoring

May: The Water Soldier Surveillance Protocol was implemented to systematically catalogue the extent and distribution of water soldier in the Trent-Severn Waterway.

May-June: Reconnaissance was completed from below Lock 14 in Campbellford to lock 8, and the presence/absence and abundance of water soldier was recorded.

July-August: Monitoring of Percy Reach, Crowe Bay and Lake Seymour was conducted. A 50 meter by 50 meter grid was overlaid on the three water bodies and at each point intercept, the presence/absence and abundance of water soldier was recorded.  The following map was produced to illustrate the distribution of water soldier in the Trent-Severn Waterway.















July-August: Wildlife Habitat Canada awarded the Ontario federation of Anglers and Hunters with a grant that allowed the working group to test the efficacy of shade cloth enclosures on leading edge populations of water soldier. One population in Percy Reach and two populations in Crowe Bay were treated with shade cloth enclosures for two months. The 10 foot by 10 foot enclosures were fashioned with rebar, landscape fabric and zip ties to prevent sunlight from entering the covered water soldier plants. After the two months of being enclosed, all the water soldier plants under the enclosures were deceased.

Shade Cloth Enclosures











September: The Water Soldier Annual Open House was held in Campbellford to inform the public of the monitoring results from 2016 and to inform about the proposed herbicide treatment for the fall, 51 members of the public came out to the information session.

October: Water soldier populations within the project area are being treated with the herbicide Reward (Diquat Dibromide) by Solitude Lake Management. Treatments tentatively start on the morning of October 18, 2016 in Percy Reach and Crowe Bay and will move onto Lake Seymour October 19 and 20.

Additional Partners

The Invasive Species Centre awarded a grant to the Ontario Federation of Anglers and Hunters in 2015 to be used for monitoring, surveillance, outreach and control.  National Fish and Wildlife Foundation has awarded a grant to the Ontario Federation of Anglers and Hunters to support the outreach, surveillance and control of invasive water soldier project in 2015. The Ministry of Natural Resources and Forestry has awarded the Ontario Federation of Anglers and Hunters with funding to control water soldier in the Trent- Severn Waterway.

For any questions and concerns relating to this project, please call the Invading Species Hotline at 1-800-563-7711.  Reported sightings of water soldier can be entered online at www.eddmaps.org/ontario.

Photo Gallery


Notice- 2016 Proposed Water Soldier Control Measure in the Trent River
354.7 KiB
Distribution Map - Water Soldier 2015
1.6 MiB