What method are they using for removal?
Here in CT, a local lake was competely rid of milfoil by a method called "suction harvesting", whereby a diver goes down with a giant vacuum, pulls the milfoil by hand, and sucks the milfoil up to a bag in a boat above. Expensive, time-consuming, and apparently highly effective.
The other option is 2-4D pellets, which are less effective.
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