CITY OF TONKA BAY

At the Heart of Lake Minnetonka
Photo montage: butterfly, bicyclists on a trail, a father and daughter playing outside, and sunflowers

Weed Spraying

LAKE WEED SPRAYING – GENERAL INFORMATION

ANSWERS TO COMMONLY ASKED QUESTIONS

 

 

Q.    How long after treatment before I will see results and what will the results be?

      Most weeds will decompose in about two weeks, much like dandelions do after you spray them.  In general, 85% of the lake weeds are controlled – sometimes more, sometimes less.

 

Q.    Can Eurasian water milfoil be controlled?

Yes.  It is controlled with aquatic herbicides.

 

Q.    How will I know when the treatment has been made?

      Notification signs are placed at various locations near the shoreline after  treatment.

 

Q.  What herbicides do you use?

      All the herbicides and algaecides we use (Reward, Aquathol K, Hydrothol 191, Navigate, Copper Sulfate) are approved by the DNR and the EPA.  Which herbicides are used will depend upon will depend upon the types of lake weeds present at the time of inspection.  After the treatment has been made, the herbicides used will be noted on the signs.

 

Q.  How long before I can swim, fish or use the lake water for my lawn?

      Generally, swimming is no restriction, fishing is prohibited for 0-3 days, and lake-to-lawn irrigation will be 0-14 days.  Exact restrictions will be posted on the notification signs.  These restrictions only apply to treated areas.

 

Q.  Do these treatments get rid of lily pads and cattails?

No.  Treatments for emergent plants such as lily pads, cattails and purple loosestrife cannot be made effectively until August. 

Official Site of the City of Tonka Bay, Tonka Bay, Minnesota