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Gypsy Moth Suppression Program

Jeremy Lowell - Program Coordinator
Carter Rogers - Assistant Program Coordinator

Bay County Building
515 Center Avenue, Suite 503
Bay City, Michigan 48708-5941
Voice: (989) 895-4195
The Gypsy Moth Suppression Program is millage funded and provides for the identification, suppression, public education, and monitoring of the Gypsy Moth and other non-native invasive species that cause economic damage and reduce the quality of life in Bay County. 

2021 Bay County Emerald Ash Borer (EAB) Treatment

The successful treatment to protect publicly owned Ash Trees took place on June 14, 2021.  For more information about the treatment that took place, please check this LINK.

2022 Bay County Spring Aerial Treatment to Control Gypsy Moth

Aerial Treatment to control Gypsy Moth (now referred to as Spongy Moth) in Bay County will be taking place the week of May 23, 2022. For more information about the treatment that took place, please check this LINK

What is a Spongy Moth? 


Introduced into the United States from Europe in 1869,the Spongy Moth  is an invasive non-native insect with larvae that feed on many North American trees and plants. Gypsy Moth caterpillars prefer oaks and aspen, but are known to feast on more than 300 species of tree and shrubs. The caterpillars have insatiable appetites and can defoliate trees causing them to be vulnerable to diseases and other pests which can eventually kill the tree. Since their introduction into the United States, the Gypsy Moth has spread throughout the eastern seaboard, south into Georgia and west into Wisconsin and Missouri. The Gypsy Moth Suppression Staff work to monitor and treat for this damaging invasive pest in order to protect our valuable trees throughout Bay County.

Fall and Winter Gypsy Moth Egg Mass Monitoring (September to January)

The Gypsy Moth Suppression Program is gearing up to conduct their fall and winter Gypsy Moth egg mass monitoring starting in October 2020 and continuing through January 2021. This monitoring will help determine the areas that will require spring treatment in 2021. Gypsy Moth monitoring done throughout this past spring and summer have shown that there are a few areas in Bay County where gypsy moth populations are still on the rise. Check out our detailed Heat Map which shows areas where higher numbers of gypsy moth egg masses were found during the last fall monitoring. Areas with more than 300 egg masses per acre were scheduled for treatment in spring of 2020 where allowed.


Gypsy Moth

Beneficial  Insects
 Value of Trees 
Tree Health
Pest of the Month


Michigan Green Schools