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Gypsy Moth Treatment


Based on the current (5-21-2022) oak leaf maturity and lack of worm sightings, treatment will not happen until sometime after the Memorial Day weekend.


A specific date/time cannot be determined at this time. Treatment will depend on many variables such as the leaf size, worm size, weather, etc. As we get closer to the treatment we will post potential day/time here and will post that it did happen and when here also.


Again, this is NOT a Foster Township initiative – volunteers have

coordinated and executed this project for you.


If you have questions/concerns please contact

David B Ball at (preferred) or phone 989.787.0127



We can no longer accept requests for treatment in Spring 2022. The list and mapping of the requested treatment areas have been finalized and submitted to the vendor. The project has grown from about 265 acres in 2021 to approximately 685 acres in 2022.



The treatment will consist of Bt (Bacillus thuringiensis), a bacterium that is naturally found in the ground which DOES NOT affect mammals (people, dogs, cats, horses, etc.). It kills the Gypsy Moths that eat the leaves that have been treated with it. Aerial application will be by helicopter and if you are outside during application, you will probably not be able to detect it since it will be a very fine mist.


It is NOT the Township or County responsibility to treat for Gypsy Moths. Shortly after the June 2021 Foster Township Board meeting where residents expressed great concern about the need for Gypsy Moth Abatement, a committee was formed to look into establishing a millage or Special Assessment District (SAD) to accomplish that goal. It was quickly determined that both of these paths were long term, 3-5 years at best, not counting the research time required to put a solid workable plan together to accomplish either goal. Therefore, it was decided that short term, we would concentrate on opening the “volunteer effort” to all of Foster Township instead of small pockets generally centered around the Clear Lake area. We accomplished that goal. With in 3 months, we had over 1900 acres of land requested for treatment. The downfall was that for whatever reason over 60% of the requests for treatment never responded – either to pay or OptOut.