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Emerald Ash Borer



Emerald Ash Borer (EAB) is an invasive beetle originally native to East Asia. Since its introduction to the United States in 2002, EAB has caused the decline and death of millions of North American ash trees. First detected in Montgomery County in 2012, EAB is causing the widespread decline of ash trees in the County right-of-way. Typically, EAB will kill an ash tree in 1-5 years after infestation. The only street trees infested by EAB are ash trees (genus Fraxinus). All other species of tree found in the County right-of-way, such as oak and maple species, are not affected by EAB.

All ash trees will eventually die from EAB unless treated. Unfortunately, widespread treatment is costly and not sustainable for the thousands of ash trees in the County right-of-way. Ash trees in the County right-of-way affected by EAB will be removed as their health declines. Replacement trees will be replanted in the right-of-way at the request of residents. Only non-susceptible tree species will be planted in the right-of-way.

If you suspect a tree in the right-of-way is infested with EAB, please request an inspection online or by calling the County’s 311 call center by dialing 3-1-1 (inside Montgomery County) or (240) 777-0311 (outside of Montgomery County). Tree Maintenance does not inspect trees on private property for EAB. If you suspect a tree on private property has EAB, please contact a tree care company with a certified arborist on staff.
Request to Inspect County Tree Online

Additional Emerald Ash Borer Resources

Maryland Department of Agriculture’s Ash Borer Page

UPDATED: November 29, 2017

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