Eurasian Watermilfoil
The following are informational links to various sites concerning Eurasion Watermilfoil facts.  You can also use any number of search engines such as Google or Yahoo to do your own research.  As you can see, there's plenty of information about it. There's just no way to get rid of it.  You can only control it.

United States Department of Agriculture

Department of Ecology, State of Washington

Wisconsin DNR Brochure

University of Florida

Penn State School of Forest Resources

University of Michgan Sea Grant Brochure.

Minnesota DNR

Great Lakes.net

Texas Agrilife Extension

Indiana DNR

Southeast Exotic Pest Plant
Council

Wikipedia