Save MI HEMLOCKS

Photo by Will Blozan, Dying hemlock trees in the Appalachian Mountains. 

In 2016, Hemlock Woolly Adelgid (HWA) was first established in the Upper Midwest, in Ottawa County, MI. As of 2025, it now stretches up the western coast of Michigan, currently with the northern extent in Leelanau and Antrim Counties. This invasive pest has devastated forests along the East Coast of the United States. Within Michigan, there are an estimated 170 million hemlock trees that are at risk of dying from HWA. However, the loss of hemlock within our forests is just the beginning.

CURRENT MAPS OF HWA DISTRIBUTION IN MICHIGAN

Long-term studies from the east coast have documented extensive negative effects caused by the loss of hemlock within natural communities. These changes affect the ecology and economy of the infested areas.

There is good news. This pest is treatable, and with your help we can keep it at bay.

We believe we can stop the spread of this forest pest before it is too late. Unlike the emerald ash borer, which recently devastated Michigan, this is pest slow moving, treatable, and concentrated on the western shore of Michigan. We need you to IDENTIFY, REPORT, and TAKE ACTION.

 More information about the ecological damage HWA can do.

 More information about the economic damage HWA can do.

Click here for More Resources