What is Milfoil?

Eurasian water milfoil (Myriophyllum spicatum) is a long slender plant that grows underwater. It has a round light colored stem with flat, feather-like leaves containing 12 or more pairs of tiny thread-like leaflets. The leaves branch from the stem in a whorl pattern.  Milfoil forms dense stands that often reach to the surface, creating thick floating mats of vegetation.

A non-native species, milfoil was probably introduced to Skaneateles Lake by a boat or boat trailer from another body of water. With no significant natural enemies, the plant has spread unimpeded at water depths of approximately 8 to 15 feet. This results in long, dense patches of milfoil running parallel to the shore up to 30 feet across. Viewed from the air, the infestation appears as a dark stripe just inside the perimeter of the lake.

Relentless Spreading

Milfoil spreads primarily by pieces of existing plants breaking off and taking root. Strong winds, boat propellers or improper harvesting methods all lead to dramatic growth of existing stands and the rapid formation of new ones.

While milfoil has been present in the lake for many years, its growth in the early part of this century has greatly accelerated, tripling coverage in five years. The total infestation was estimated at approximately 30 acres in 2007; however, since then we have found additional patches totaling some 10 acres. We have removed most of the remaining patches in 2011 and will now work on keeping the population under control.

Your contribution by joining the Skaneateles Lake Association as an Active Member will help to make this possible.