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Emerald Ash Borer


Non-Native Insect
Emerald ash borer (EAB) is a non-native insect that was discovered in Michigan in the summer of 2002. EAB insects feed on ash trees, which over time results in tree mortality. Since their discovery, state and local governments have made significant efforts to eradicate them. Despite efforts made, the insect population has continued to migrate in all directions from its origin in Michigan.

The United States Department of Agriculture (USDA) has been monitoring the insect population as it established itself in Illinois. EAB populations have been confirmed in Highland Park in 2011 and in the nearby communities of Lake Forest, Glenview, Buffalo Grove and Libertyville. More information on the Emerald Ash Borer in Highland Park can be found in this attachment.

Information for tree inspection when buying or selling a home.

Ash Tree Removal
The City’s Forestry Division stopped planting ash trees in 2003 once it was understood EAB would not be quarantined in Michigan. Since 2011, when EAB was discovered here in Highland Park, the City has been removing ash trees located on public property that have been attacked by EAB. Though treatment to prevent Emerald Ash Borer attack on ash trees is possible, it is not financially feasible on a city-wide scale. However, homeowners should consult a Certified Arborist as preserving their ash may make sense. Ash trees made up approximately 15% of our street tree population in 2011, but as of summer 2017 are down to about 1.5% of street trees. 

Additional Information
Additional information on the emerald ash borer can be found by visiting the Illinois Department of Agriculture.