Emerald Ash Borer


Adult beetle is metallic green and about 1/2-inch long.



Infected native ash trees will display declining foliage in crown and branches; shoot growth from roots and trunk; S-shaped larva galleries underneath bark;  adult beetles will leave D-shaped exit holes; increased woodpecker activity


How EAB Spreads 

Adult borers can fly from 1/2 to 2 miles in its lifetime. The main reason for its rapid spread is through the movement of firewood and other ash wood products.


How Trees Die

Ash tree damage is caused by larva tunneling underneath the bark.  The extensive chambers disrupt the flow of water and nutrients to the tree's canopy.


Management Options

Know if you have native ash trees on your property. Learn the signs of an EAB infestation. Options are to let tree die, removal, or chemical treatment. Each option has costs and benefits and must be weighed carefully.  Consult with professionals and experts to help make the right decision. 



It is very likely that many, if not most, North American ash trees will fall victim to EAB.  Replacing these trees with a variety of other suitable tree species will ensure that our urban forests will continue to thrive. 



Emerald Ash Borer (EAB) threatens native Ash trees in North America. Since its introduction in 2002, this invasive insect pest is currently spreading across the Eastern U.S. and Canada. While all native ash trees are susceptible to EAB-caused mortality, there is evidence that some individual species may be more resilient, especially healthy blue ash growing on good sites. 

D-shaped 1/8-inch exit holes are unique to this family of insects.  

Ash trees grow naturally in hardwood forests from Nova Scotia west to Minnesota, south to northern Florida, and southwest to eastern Texas. Many native ash trees have also been planted outside their natural range to other parts of the United States.

Webinar Resources

Basic EAB Biology and Why You Need to Plan (Michigan State University)

This hour-long  webinar provides a complete overview on what homeowners should know about the Emerald Ash Borer and how they can response.

Chemical Control for EAB: What Works, What Doesn't Work, and Why (Purdue University)

This hour-long  webinar  describes chemical treatment options to help protect single ash trees from EAB. The program also helps homeowners make the decision on whether or not to use one of these treatments on their tree.

EAB 101: What Happened & What's Happening Now (Ohio State University/Purdue University)

This hour-long webinar explains how the Emerald Ash Borer came to the U.S. and has spread across the East.  It also describes steps that can be taken to mitigate the EAB's impact on America's ash trees.

Credit Line: Village Trees, LLC (Murfreesboro, Tennessee)