Eurasian water milfoil (Myriophyllum spicatum)

Eurasian water milfoil (Myriophyllum spicatum)

Eurasian water milfoil is an aquatic plant native to Europe, Asia, and Parts of Africa. Introduction to North America is believed to have occurred in the early 1900's. The source of introduction is unknown, but the aquarium trade is suspect as well as United States Department of Agriculture.

 It was first discovered in Lake Champlain in 1962 in St. Albans Bay. By 1976, several thousand acres were estimated to be infested in Lake Champlain, and is the most abundant plant species in 11 of lake's wetlands. At least 40 other bodies of water have been infested in Vermont, and new ones become infested every year. 

Milfoil usually forms very dense patches, reducing light penetration and light availability for native plant species and altering fish and wildlife habitat. It also is a nuisance for boat motors, fishing, and swimming activities. Since 1982, Vermont has spent over $4.1 million dollars on Eurasian water milfoil control.

Marsden, E, and m Hauser. "Exotic species in Lake Champlain." Journal of Great Lakes Research. 35.2 (2009): 250-265. Web. 15 Apr. 2012.