Quick Facts

  • Adult beetles are metallic green and about ½-inch long
  • Adults leave a D-shaped exit hole in the bark when they emerge in spring
  • Woodpeckers like Emerald Ash Borer larvae; heavy woodpecker damage on ash trees may be a sign of infestation
  • Firewood cannot be moved in many areas of Michigan, Ohio and Indiana because of the Emerald Ash Borer quarantine (Ohio, Indiana, Michigan)
  • Probably came from Asia in wood packing material.

Species Facts:

Emerald Ash Borer, Agrilus planipennis Fairmaire, is an exotic beetle that was discovered in southeastern Michigan near Detroit in the summer of 2002. The adult beetles nibble on ash foliage but cause little damage. The larvae feed on the inner bark of ash trees, disrupting the tree's ability to transport water and nutrients.

Emerald ash borer probably arrived in the United States on solid wood packing material carried in cargo ships or airplanes originating in its native Asia. Emerald ash borer is established in Windsor, Ontario. The beetle was found in Ohio in 2003 and northern Indiana in 2004.

Since Emerald Ash Borer’s entrance into the United States, it has killed at least 8 million to 10 million trees in Michigan, Ohio, and Indiana (most devastation in southeastern Michigan). It has also caused regulatory agencies to enforce quarantines (Ohio, Indiana, Michigan) and fines to prevent potentially infested ash trees, logs, or firewood from moving out of areas where Emerald Ash Borers live. This beetle has also ultimately cost municipalities, property owners, nursery operators, and forest product industries tens of millions of dollars.

Portions of this article courtesy of: Emerald Ashborer Info
image of 'Emerald Ash Borer'Image of Emerald Ash Borer (Photo from: www.bugwood.org Credit to: Debbie Miller)