The approach of using "light blocker sheets" called
bottom barriers is being utilized with some success on Squam Lake.
click for more information This link also provides some information on proposed legislative action and, as Joe Kerr has asked, suggests some things you can do to help.
For an informative video (Windows Media Player) click on the link below.
Milfoil video: NH's Lakes Under Attack!
High speed Connection (ie 772 kbps DSL, cable modem, satellite) - 33.1 MB file
(approximately 7 minute download time)
Slower Connection (ie 56 kbps modem) - 12.9 MB file
(approximately 44 minute download time)
If the link above doesn't work it can be found below
click for milfoil video
For a list of New Hampshire Conservation organizations working to combat invasive species
click here
Photo of a bottom barrier on Squam Lake.