Lake Minnetonka Conservation District

Eurasian Watermilfoil


Coordinated Herbicide Treatment Projects

The LMCD (in coordination with its AIS Task Force) has participated in a number of herbicide treatment projects over the years.  Some of these include: 1) the use of Sonar (fluridone) in the early 1990’s on Libbs Lake (consideration was also given to St. Albans Bay), 2) Triclopyr studies on Lake Minnetonka in the mid and late 1990’s, 3) a Milfoil Demonstration Project on Carmans, Grays, and Phelps Bays in 2006.  This was the impetus for the creation of a formal Lake Vegetation Management Plan (LVMP) in 2007 and 2008 for these three bays, and 4) a five year, three bay Coordinated Herbicide Treatment Demonstration Project on Carmans, Grays, and Phelps Bays from 2008 through 2012.  The primary goals of this demonstration project were to:

  • Evaluate whether Eurasian Watermilfoil and Curly-Leaf Pondweed could be managed with lower dosages of herbicides on a whole bay; and
  • Evaluate whether these treatments would damage the native plants in these three bays.

In April of 2012, the AIS Task Force provided an Assessment of 2008-2011 Coordinated Herbicide Treatments on Carmans, Grays, and Phelps Bays; based on the LVMP goals and objectives.  This assessment was presented to the LMCD Board of Directors with a recommendation that the Board should not extend the three-bay project beyond 2012, or expand the project to other bays, until a comprehensive vegetation management plan was developed for all of Lake Minnetonka.  The LMCD Board concurred with this recommendation.

In March, 2013, the LMCD adopted a LMCD Comprehensive Eurasian Watermilfoil and Curly-Leaf Pondweed Plan for Lake Minnetonka.  The LMCD invites you to read this Plan and direct questions to Executive Director Vickie Schleuning at 952-745-0789 or