Thank you for your report! Emerald ash borer makes D-shaped holes about 1/8" wide. Here is the address of Oregon Department of Agriculture's IPPM Survey and treatment projects EAB page

https://www.oregon.gov/oda/programs/IPPM/SurveyTreatment/Pages/EmeraldAshBorer.aspx

Scroll down to find photos of Emerald Ash Borer Look-Alikes, the EAB Response Plan for Oregon, and more information about how to recognize EAB attack, so that you can monitor your trees.

Tom Valente
Aug. 22, 2023, 1:12 a.m.

Submit pictures of insects if you can. And pictures of the trees. That will help make an ID.

If your trees do have EAB, then saving them is not really feasible if they have more than 30% crown dieback. However, this time of year, Oregon ash is losing its leaves and thus may lead one to think it is sick. Ash is one of the first trees to drop its leaves in the fall and this is normal. Again, posting some pictures will help us identify if it is EAB or something else. Here is the Oregon Department of Forestry fact sheet on EAB:

https://www.oregon.gov/odf/Documents/forestbenefits/fact-sheet-emerald-ash-borer.pdf

Wyatt Williams
Aug. 22, 2023, 8:04 a.m.