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BELMONT — Parts of Lake Winnisquam will be treated on Wednesday, Aug. 21, to control milfoil, an invasive aquatic plant.

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Milfoil growing beneath the surface of the water on Lake Winnipesaukee. ©2019 Karen Bobotas Photographer

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LACONIA — Controlling milfoil in New Hampshire waters has been a concern since it first appeared here in the 1960s, but the methods of dealing…