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Bone Lake Protection: Invasive Species:

Eurasian Water Milfoil

Eurasian Water Milfoil is not present in Bone Lake, but has invaded lakes very close by.

EWM is present in:
• Pike Lake in Amery, and
• Long Trade Lake at the Polk/Burnett border

Hybrid Northern /Eurasian Water Milfoil is present in Long Trade Lake and Horseshoe Lake.


Eurasian Water Milfoil in Long Trade Lake. Photo by: Jeremy Williamson

What is Eurasian Water Milfoil (Myriophyllum spicatum L.)? EWM is an "evergreen" perennial aquatic plant that grows submersed in water as deep as light will penetrate and loves our clear waters. The only part of the plant that grows out of the water is the short flower stalk late in the summer. The submersed shoots form a dense offensive canopy at the water's surface.

EWM was first reported in the United States in the 1940's in Chesapeake Bay and spread rapidly. The current EWM distribution includes 45 of the 50 states and three Canadian provinces. EWM is possibly the most widespread nonnative aquatic plant in North America. Get more info

Here's how to identify Eurasian Water Milfoil. If you find an invasive species in Bone Lake, bag a sample including as much of the plant as possible, record the location, and contact Bob Boyd, Bone Lake commissioner, at (715) 857-5495.