Water Weeds of Wonder

Residents of Lunenberg, MA are livid about the infestation of Lake Shirley with Eurasian water milfoil (Myriophyllum spicatum), according to this article in the Sentinel & Enterprise. The article goes on to mention that all but 4 lakes in Massachusetts contain invasive species. Turns out this isn't quite true...yet. What the Mass. Congress of Lake & Pond Associations meant was that out of about 200 lakes managed by the Department of Environmental Management, all but 4 have invasives. They are still collecting data on the 3000 or so lakes and ponds in the state, but so far at least 50% have at least one invasive species present.