Lake residents are encouraged to treat these plants in an area in front of your property. Up to 625 square feet can be treated in the lake in front of your property without first obtaining a permit from IDNR. Click on this link to download and open a very good pamphlet by Carole Lembi of Purdue University entitled AQUATIC PLANT MANAGEMENT, where she helps the reader identify and treat many common aquatic weeds. You may also contact a licensed pesticide applicator to control nuisance vegetation. They can correctly identify the types of plants, select the appropriate herbicides and doses, and obtain all necessary permits. They do charge fees for their services and you can find a list of companies that specialize in aquatic weed control at this link.