Ash borer infection
Hello. Normally, Emerald Ash Borer damage would be seen underneath the bark and would normally start at the top of the tree. Here is the link to our Emerald Ash Borer Information page: https://entomology.ca.uky.edu/entfact/kentucky-emerald-ash-borer-eab-resources-updates
I would ask that you contact me directly for more information on diagnosing for the Emerald Ash Borer.