Ash Borer

By: Aaron Baskerville
By: Aaron Baskerville

The state's EAB Response Team is checking all ash trees in an area of 1.25 square miles in Delta Township. They are marking ash trees for potential removal.

Southeast Michigan is considered the core of the problem, with the beetle killing nearly six million trees. The state is looking at eliminating trees that lie outside the general infected areas.

A target date of May 15 has been set for removal of infected ash trees. The Michigan Department of Agriculture will hold three more public hearings throughout the state.

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Emerald Ash Borer

  • The Emerald Ash Borer belongs to a group of insects known as metallic wood-boring beetles.

  • Adults are dark metallic green in color, 1/2 inch in length and 1/16 inch wide, and are only present from mid May until late July. Larvae are creamy white in color and are found under the bark.

  • The borer's host range is limited to species of ash trees (identified by their distinctive leaves, which are located directly across from each other on the leaf stem, and bark).

  • In Michigan, most ash tree are white, black or green.

  • Emerald Ash Borer does not attack mountain ash, which is not related to white, black, or green ash trees.

  • Usually their presence goes undetected until the trees show symptoms of infestation – typically the upper third of a tree will die back first, followed by the rest the next year.

  • This is often followed by a large number of shoots or sprouts arising below the dead portions of the trunk.

  • The adult beetles typically make a D-shaped exit hole when they emerge. Tissue produced by the tree in response to larval feeding may also cause vertical splits to occur in the bark. Distinct S-shaped tunnels may also be apparent under the bark.

    Source: http://www.michigan.gov/mda (Michigan Department of Agriculture Web site) contributed to this report.


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