Aquatic Control Technology, Inc. recommended the use of Renovate (active ingredient triclopyr) herbicide for treatment at Lake Mishnock in 2007.  Triclopyr is a systemic-acting product that controls the entire milfoil plant including the root structures.  Successful triclopyr treatments typically provide multiple year control of milfoil.  Triclopyr has been used for terrestrial weed control for many years and has been evaluated for aquatic weed control for more than a decade, but it did not receive a full aquatic label from EPA until 2005.  

   This product was previously discussed with LMPA, but was not  recommended because the liquid formulation was prohibitively expensive ($1000 per acre for chemical alone) and there was limited treatment experience on variable watermilfoil.  Over the past two years, testing performed by the US Army Corps of Engineers and the manufacturer has demonstrated that triclopyr is effective on variable watermilfoil.  In November 2006, a solid formulation of triclopyr (Renovate OTF – On Target Flakes) received an aquatic label from EPA.  The flake formulation allows the herbicide to be concentrated in the lower 4 feet of the water column and makes the product much more cost-effect for deeper water treatments.  Again the primary advantage of triclopyr is that it should provide multiple-year control of milfoil.  It should also be more selective, leaving many of the native species untouched.  Triclopyr targets dicot or broadleaf species, which include milfoil and waterlilies.