Pests
Emerald ash borer
Emerald ash borer is a metallic green wood-boring beetle from Asia whose larvae feed under the bark of ash trees and have killed tens of millions of them in North America.
USDA APHIS says the emerald ash borer (EAB) is an invasive wood-boring beetle from Asia. The adult lays eggs in bark crevices of ash trees. The eggs hatch, and the larvae burrow in and feed. That feeding damages the tree. EAB was first detected in North America in 2002 in southeast Michigan.
APHIS also says damage is hidden under the bark, so the beetle is hard to find early. Adults leave a D-shaped exit hole when they emerge. Ohio sits near where the beetle was first found, and Hamilton County confirmed it in 2007. The pillar guide on ash trees, emerald ash borer and stumps covers what that means for a yard.