AUGUSTA — The Maine Department of Environmental Protection is considering use of herbicides to stop an invasion of the aquatic plant hydrilla in Damariscotta Lake in Jefferson.

The DEP says the problem is in a densely infested lagoon. Workers already pulled weeds by hand and put barriers on the bottom of the lake to stop the spread of the invasive plant.

Now the DEP is considering spot application of herbicides in the lagoon, which is three-tenths of an acre in size.

The hydrilla infestation in Damariscotta Lake is one of only two in Maine. The other is on Pickerel Pond in Limerick.