The Okauchee Lake Management District has conducted aquatic plant surveys regularly since 1992. Eurasian Water milfoil has been present in each survey and was found in a survey in 1977. In 2013, milfoil was found in 43% of the sample points. This was down slightly from 56% in 2008. The native milfoil was found in only 5% of the sample points in 2013. Milfoil covers a wide range of areas in Okauchee Lake, from the shallow bays to the deep water. Okauchee Lake also has a native milfoil. Native plants, although sometimes a nuisance as well, have helped control the amount of milfoil. The District’s efforts, relying on herbicides and harvesting, is effectively managing the milfoil in Okauchee Lake. To date, there have been no signs of milfoil herbicide resistance in the lake.
Please visit the “Reports” page for the DNR article: “The Science Behind The Superweed – Eurasian Water Milfoil.” This article has been reprinted with permission of Wisconsin Natural Resources magazine.