Gypsy Moths Program

2020 Gypsy Moth Spray

Notice of Spring Treatment and Public Hearings 

We sent three letters to property owners impacted by the 2020 Gypsy Moth Suppression Program. The first two informed property owners of the public hearings associated with the program. The final letter explained more about the program's purpose and how it works. 

The first public hearings for the 2020 Gypsy Moth Suppression Program Special Assessment was held on April 20, 2020 City Council meeting.   During the meeting, the City Council held public hearings to take public comments from interested persons affected by the proposed project. We sent the notices linked below to all the impacted property owners describing the process and how to provide public comment. 

The second public hearings for the 2020 Gypsy Moth Suppression Program Special Assessment was held at the May 4, 2020 City Council meeting. During the meeting, the City Council held public hearings to take public comments from interested persons affected by the proposed project. We sent the notices linked below to all the impacted property owners describing the process and how to provide public comment. 

2020 Spring Treatment

05/31/2020 Update: Our consultant has identified June 1 as the day for treatment. Helicopters will be in the area in the morning tomorrow. 

We partner with Hamilton Helicopters, Inc. to perform gypsy moth treatments in mid-May to early June. The exact date is determined through continued monitoring of weather conditions, as well as caterpillar and tree canopy development. Spraying will be done when average wind speed is less than 10 miles per hour and relative humidity is more than 50-percent. In most cases, these constraints limit spraying to a morning activity.

2020 Treatment Locations

Using resident complaints, tree damage assessments and egg mass surveys, our consultant, Aquatic Consulting Services, LLC, determined the areas of treatment. A total of 575 acres are scheduled for treatment this year. You can find treatment locations on the Aerial Spray Map 2020 Map (PDF) or use the Interactive, Searchable Gypsy moth Map.

Property Owner Cost

If a property you own is within a treatment location, a fee is assessed on your 2020 Summer Property Tax Bill.

  • $26 for small parcels with equal to or less than .5 acres
  • $82 per treated acre for parcels larger than .5 acres

How It Works

The insecticide used in this process is a naturally occurring bacteria called Bacillus thuringiensis (Bt), which is also used by organic gardeners. The applicator is Hamilton Helicopter, Inc., PO Box 264, 4488 134th Avenue, Hamilton, Michigan, 49419, (616)291-5808. The Bt brand used is Foray 76B (or equivalent). On treatment days, our contractor will apply 1 quart of the Bt material over each acre in a very fine mist. It’s unlikely for people to see or feel it. Drying takes 4 - 6 hours and once dry, rain does not wash it away.

The Bt only affects the caterpillars of moths and butterflies that are actively feeding at the time of treatment, which is why the application date varies. In an effective spray application, you may notice a change in the level of activity and responsiveness of the caterpillars, and they will die in 5-7 days. 

Learn More About the Program

Gypsy Moths Suppression Program

Residents and property owners can use several techniques to help suppress this pest. Below is a collection of documents that are useful in understanding the gypsy moth, its treatment, and the techniques you as residents and property owners can use to minimize this pest on your property. 

Updates and More Information

We'll post additional details about the treatments on Facebook and Twitter and update this page. Have questions about the City of Wyoming Gypsy Moth Suppression Program? Contact us at the City Clerk's Office by calling 616-530-7296 or completing our Gypsy Moth Reports and Inquiries Form below.  

Gypsy Moth Reports and Inquiries

Use this form to report gypsy moths in your home or neighborhood, or to inquire as to the status of Gypsy moth suppression efforts.

* Required