Eurasian watermilfoil (Myriophyllum spicatum L.), first discovered in the Basin in 1962, is found in many of Lake Champlain's bays and surrounding lakes. In some areas infestations are severe. While details are available on some infestations, many lakes have little or no studies on the presence of Eurasian watermilfoil.

However, new programs like the Adirondack Park Invasive Plant Program, and existing programs by the Vermont Department of Environmental Conservation (VT DEC) are increasing awareness of infestations and preventing further spread of the plant. Please visit the links below or click on the thumbnail maps (left and below) for detailed information about Eurasian watermilfoil locations in the Basin.

Eurasian watermilfoil is spread by plant fragments transported by waves, wind, currents, people, and animals. It is not easily controlled. Controls include mechanical harvesting, diver-operated suction harvesting, hydro-raking, installation of bottom barriers, lake level drawdown, fragment barriers, handpulling, and biological control. An experimental program using the chemical Sonar has been done on some Vermont lakes.

Biological control, using the native watermilfoil weevil Euhrychiopsis lecontei is showing some promise. The VT DEC has been working with the weevils since 1989, and has had success on Brownington Pond. The LCBP has supported research on Lincoln Pond in New York by Cornell Cooperative Extension using moth larvae (Acentria ephemerella), another form of bio-control.

Recreational boaters can help control the spread of Eurasian watermilfoil to more lakes and ponds by following some easy tips. Please read "Help Stop the Spread of Nuisance Species."

• Adirondack Park Invasive Plant Program
• Biological Control of Eurasian Watermilfoil (U. Of Minnesota)
• Eurasian Watermilfoil Control in Lincoln Pond (Cornell Coop. Ext.)
• Eurasian Watermilfoil in Vermont (VT DEC)
• Map of Eurasian Watermilfoil Distribution in the US (USGS)