The Invasive Species Program maintains an infested waters list of all water bodies known to have milfoil and other invasives. The infested lakes list is also printed in the DNR Fishing Regulations every year.
Eurasian watermilfoil is a submersed invasive aquatic plant that was inadvertently introduced to Minnesota. Milfoil was first discovered in Lake Minnetonka during the fall of 1987. Eurasian watermilfoil can limit recreational activities on water bodies by forming mats on the water surface, and alter aquatic ecosystems by displacing native plants.
Milfoil can be controlled using aquatically approved herbicides or by mechanical means, such as a harvester or cutter. The DNR Aquatic Plant Management Program regulates the control of aquatic plants. In most cases a permit from the DNR is required to control aquatic plants, including milfoil. The DNR publication, "A Guide to Aquatic Plants" provides information about aquatic plants and how and when to obtain a permit to destroy them.
Milfoil is spread from one body of water to another primarily by the introduction of plant fragments. A milfoil fragment only a few inches long can form roots and grow into a new plant. The most important action that you can take to limit the spread of milfoil and other aquatic invasive plants is to remove all vegetation from your watercraft before you move it from one body of water to another. For more information contact the Eurasian Watermilfoil Management Program.