The chemical herbicide triclopyr was selectively applied to Lake Fairlee on Friday, May 31, to control the aquatic invasive plant Eurasian watermilfoil, Myriophyllum spicatum in dense beds around the lakeshore.
Originally scheduled for Thursday, the application was delayed until Friday. Local residents were informed of the application, which was authorized by the Department of Environmental Conservation’s Aquatic Nuisance Control Program, before it was scheduled.
Lake Fairlee is not officially closed. However, as a precautionary measure, under advice from the Vermont Department of Health, the public is strongly encouraged to comply with the following voluntary use restrictions for Lake Fairlee and the waterway downstream to its confluence with the Ompompanoosuc River:
• No use of the water for any purpose Friday, May 31 or Saturday, June 1.
• No use of the water for drinking, or for food or drink preparation until further notice.
• No use of the water for recreation (swimming, boating, fishing) until Sunday, June 2.
• Other domestic uses, other than for drinking, or for food or drink preparation may resume Sunday, June 2.
• No use of water for irrigation for 120 days or until further notice.
Triclopyr is a highly effective broadleaf herbicide that is used to control a variety of nuisance and invasive aquatic plant species, and is very selective to Eurasian watermilfoil. Triclopyr is most effective when applied when Eurasian watermilfoil is actively growing, thus a late spring treatment is generally most effective.
The displacement of native aquatic plants in particular has been seen in lakes in Vermont where Eurasian watermilfoil has become widespread and dense. By using this herbicide selectively Eurasian watermilfoil growth can be controlled manually in other areas of the lake and improve habitat for the native aquatic plants in the lake. Uncontrolled, Eurasian watermilfoil will eventually out-compete the native plants. Native plants will not be significantly affected by this treatment.
Please contact the Lake Fairlee Association, via Skip Brown at 802-333-4541 or Suzy Kerr at 802-333-9079 for additional information.
Up to date information may also be obtained by visiting the Lake Fairlee Association webpage http://blog.lakefairlee.org/?page_id87
Visit Vermont’s Aquatic Nuisance Control Program webpage at: http://www.anr.state.vt.us/dec/waterq/permits/htm/pm_anc.htm