Douglas County Public Works will soon treat reemerging areas of Eurasian Water Milfoil (EWM) in a portion of the southeast arm of Lone Star Lake with an herbicide.  The treatment with an herbicide called Navigate is planned for Tuesday, September 5, weather permitting.

Some EWM has reemerged in the shallow portions of the southeast arm of the lake following the last herbicide treatment in April 2016. EWM is a non-native plant that threatens native aquatic plants and lake ecology.  Richard Sanders, fisheries biologist, Kansas Department of Wildlife, Parks & Tourism, has recommended the treatment, and will accompany park maintenance personnel during the treatment.   

The Navigate herbicide is in granular form.  It sinks quickly to the lake bottom.  Restrictions for this herbicide include prohibiting swimming for 24 hours after application, but swimming is always prohibited in the portion of the lake to be treated.  While the herbicide has no restrictions for watering livestock, signs will be posted encouraging park visitors to keep their pets out of the treated portion of the lake for 24 hours after treatment.  Fishing or other restrictions are not needed following this herbicide treatment.