Via Flickr Grace Smith | September 20, 2022 The Iowa Department of Natural Resources plans to start treating East Okoboji, Upper Gar, Lake Minnewashta, and Lower Gar this week with Sonar A.S., an aquatic herbicide, to eliminate Eurasian watermilfoil, an invasive plant. Eurasian watermilfoil was found in these lakes in early August. The DNR will…