Emerald Ash Borer - it's tiny, as you can see. Bright, metallic green. The adult beetle emerges in the spring, resulting, due to the shape of it's head, in D-shaped exit holes. The adult feeds on foliage throughout the summer, but causes little damage. Eggs are laid under the bark of the ash tree from Mid May to mid-August. The larvae cause the fatal damage.
Photo at left: Michigan State University, photo at right University of Georgia.
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