In younger ash there is a distinctive smooth silver grey bark and sooty black buds.

BBC: The heartbreak of watching the slow death of ash trees

Officials are planning future beetle surveys and will try to limit the infestation with "girdling, " in which thick strips of bark are removed from around infested ash trees.

WSJ: Mass. creates quarantine zone to contain insect

The emerald ash borer is metallic green and eats only ash trees, with the larvae feeding just below the bark and adults eating the leaves.

WSJ: Mass. creates quarantine zone to contain insect

D-shaped holes in the bark or new tree shoots emerging at the root zone of your ash trees may be a sign of infestation by the Emerald Ash Borer, an insect native to the Far East that targets ash trees, says Dave Dailey of Birchcrest Tree and Landscape, in Rochester, N.

WSJ: Getting to the Roots of Your Trees' Stress