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American Elodea (Elodea canadensis) is common in the Northern and North Central states south to Kentucky and Virginia. Elodea can grow into dense populations that reach to or near the surface easily prohibiting recreational water use.
Note: See also Hydrilla an exotic submerged plant found in the Southern states that looks similar.
Americana Elodea > Averages three leafs per whorl with smooth leaf edges.
Hydrilla > Averages three to five leafs per whorl with rough toothed leaf edges.
Hydrothol 191 Granular is a favorite, it is easy to apply and very broad spectrum. An alternative is Reward liquid herbicide equally effective and broad spectrum. Most people prefer the granular Hydrothol because of its easy to apply granular formulation.
Elodea plant fragments can develop into new plants. If you are going to physically cut or rake this plant for control we suggest limiting the control size.