Insects and Spiders - native

Western Ash Borer (Neoclytus conjunctus) on May 13, 2024

Submitter does not have a specimen
EDRR Status: Local expert notified

Description of specimen

It is about an inch in length, and colored brown and grey with distinctive yellow markings on its back. I've included four iPhone pictures. The insect is well camouflaged and hard to see. I tried to center it in the image.

Please identify what is killing my ash tree and advise me on the necessary treatment asap. I'd like to save my tree if I can.

Thank you,

Michael O'Connell


Thank you for your report! That is not EAB. That's a secondary borer in ash trees, Neoclytus conjunctus, the Western ash borer.

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

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 tree.

Tom Valente
May 14, 2024, 10:17 a.m.