Emerald ash borer (EAB) continues to devastate ash trees throughout the invaded range (37 states and 6 Canadian provinces as of 2026). Through the years this insect has left a trail of dead ash (Fraxinus spp.) in its wake, estimated at tens, if not hundreds, of millions of trees. Some communities took a proactive approach during these years and were able to save upwards of 90% of their pre-EAB ash trees, whereas other communities were caught off guard, and now not a single ash can be found. Still, there are parts of the Midwest and New England where EAB is relatively new or slow-moving, and these areas are just beginning to experience the mass elimination of ash from the landscape.
For areas already ravaged by EAB, the insect is sadly here to stay, and the scientific community recommends that EAB treatments not stop for the remaining ash trees. If treatments were to stop, remnant EAB in the area will exploit the suddenly defenseless tree and kill it. In areas experiencing the initial stages of an EAB invasion, the time is now to make decisions regarding your tree(s), not when tree decline becomes evident. Treatment to protect trees against EAB are highly effective unless the tree has been damaged by larval boring in the conductive tissues. Ask your Bartlett Arborist Representative for a complimentary inspection this spring.
