Recognizing emerald ash borer damage - Insects in the City
https://citybugs.tamu.edu/2015/10/23/recognizing-emerald-ash-borer-damage/
Oct 23, 2015 · The next clue to an emerald ash borer infestation is the presence of S-shaped tunnels under the now-loose bark of the tree. If you see looping, S-shaped, frass-filled galleries under the bark of your ash tree, you have the first convincing evidence of EAB attack. Though not easy to see, you may also notice 1/8 inch long, D-shaped holes in the ...
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