A second herbicide application is scheduled for Lake Zoar in Newtown, Southbury, Oxford and Monroe.  Selected areas will be chemically treated with Diquat, targeting control of the aquatic nuisance plants Eurasian watermilfoil and curlyleaf pondweed.  The treatment is tentatively scheduled for Tuesday.   Prior to treatment, the lake shoreline in the treatment areas and at public access sites will be posted with printed signs in accordance with state Department of Energy and Environmental Protection requirements.  A map showing the specific treatment areas will be posted at the State Boat Ramp and at other public access sites, prior to treatment.  There will be no restrictions for swimming, boating and fishing in treated areas, but use of treated lake water for drinking purposes and for irrigation is not permitted for 3 days. These temporary water use restrictions apply only to the areas treated and affected by treatment.