Eurasian Water Milfoil

Aquatic Invasive Species:  Eurasian Water Milfoil

By, Jason Tutkowski

Water Intern

North Lakeland Discovery Center

While paddling or boating on any lake I always keep on the lookout for Eurasian water milfoil.  It is an aquatic invasive plant that has the potential to explode in growth if it were ever to invade the lakes in the Town of Winchester.  It is a submersed aquatic plant that rapidly grows in the spring and continuously throughout the summer.  Eurasian water milfoil has many defining features.  Like all milfoils it has four feather-like leaves that encircle the central stem.  The stems themselves may also show a red-pinkish color.  On each feather there are 12 or more pairs of leaflets (thin/compact leaves).  Northern water milfoil, its native lookalike, has the same feather arrangement, but has only 10 pairs of leaflets or less.  So, why exactly does it have the potential to become such a big problem in Winchester?  This plant spreads via fragmentation and is dispersed by the water current and boat traffic.  Any boat that runs through a clump of Eurasian water milfoil has the potential to tear pieces off.  Each of those pieces can grow into a new plant, so in lakes that have a boat landing and high boat traffic the possibility of spreading it increases.  The plants can also grow in thick clumps that prevent sunlight from reaching native plants as well as disrupting recreational activities such as fishing, boating, and swimming.  If you suspect that you have potentially found Eurasian water milfoil please contact the North Lakeland Discovery Center at ais@discoverycenter.net or by phone at 715-543-2085.  Feel free to also bring a sample to the Discovery Center in a plastic baggie filled with water.  Note where you found it on a map and describe the area you found it.  Early detection is key to preventing the spread of this invasive plant. 



NOTE: This will be Jason's last post before he heads off to grad school. Thanks, Jason, for your contributions to the Birch Lake blog this summer. If you're up north again next summer, we'd welcome more.