Selected areas of Lake Zoar were chemically treated with Diquat herbicide and copper sulfate algaecide yesterday.  This was done as a targeted way to control invasive Eurasian watermilfoil and curlyleaf pondweed.  A map showing the specific treatment areas was posted at the State Boat Ramp and at other public access sites.  There was no swimming in treated areas on the day of treatment.  Treated lake water can not be used for irrigating turf or ornamentals for 3 days or for irrigating food crops or production ornamentals for 5 days.