The Culprit: Emerald Ash Borer

Emerald Ash Borer larva

Emerald Ash Borer larva.

Emerald Ash Borer adult beetle

Emerald Ash Borer adult beetle.

Photos Courtesy Michigan Department of Agriculture.

The emerald ash borer (EAB) is an invasive exotic insect native to Asia that was first discovered in North America in the summer of 2002. It is believed that the insect was accidentally transported to Southeast Michigan in wooden packing materials.

In the early stages of an infestation, the EAB larvae cut off a tree's supply of water and nutrients through a process called "girdling" as they create feeding tunnels, or galleries, under the bark. Once the insects mature, the adult beetles, which are a metallic emerald green and about 1/2 inch in length, emerge from under the tree's bark, leaving behind a distinctive D-shaped exit hole. At that time, they reproduce and lay more eggs, again under the bark of an ash tree.

For more information, please call the state's toll-free Emerald Ash Borer Hotline (866-325-0023) or visit the Michigan Department of Agriculture's EAB web site.

Targeting Michigan's core emerald ash borer infestation area of Lenawee, Macomb, Monroe, Oakland, St. Clair, Washtenaw, and Wayne Counties.