Invasive Species Information and FAQ

Several years ago Eurasian Water Milfoil (EWM) was found in Long Lake. Since that time the lake has been treated frequently in an effort to control this invasive weed. In 2011 Curly Leaf Pond Weed (CLPW) was also discovered in the lake. We have received a grant from the Wisconsin DNR that will help with the cost of treating the CLPW.

Prior to 2012 we generally treated EWM using a herbicide in granular form in areas of the lake that had the densest growth.  In 2012 we tried a liquid “whole lake”  herbicide treatment that was extremely effective.  During May 2013 we treated the lake for CLPW.  No treatment was performed for EWM in 2013 because the only areas of the lake that contained significant concentrations of EWM were areas that were also being treated for CLPW and the herbicide that was used to treat CLPW can also reduce EWM.  In 2014 there was again no treatment for EWM.  This year that was because very little EWM had emerged in the spring before natural plant growth emerged.

Frequently Asked Questions
– How long should we stay out of the water after the lake is treated? Some people get a rash from the treatment. It’s a good idea to stay out of the water for 24 hours after treatment.
– Is it safe to eat fish taken from the lake after the treatment? Yes, fish are not impacted by the treatment.
– Can we draw water from the lake? Do not use water drawn from the lake to water flowering plants for 2 – 4 weeks. It should be ok to water lawns, but be careful of your other plants.
– Can we rake the dead EWM from the lake? Not for 4 – 6 weeks. It takes that long for the herbicide in the treatment to completely kill the plants. If you rake before the plants are completely dead, they will regenerate from the roots.


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