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on Mespilus germanica on thin part trunk/first branches. Lg on pictures excavated by woodpeckers. LG zigzagging deeply sunken in the wood, severe damage, but tree still alive. d-shape exit holes 3,5mm wide. not all exit holes are neatly d-shaped.
Answer
Dear Froukje, thanks for this question and a nice pictures. Yes, the gallery seems to me very much like gallery system of Agrilus sinuatus. This species is very probably the author of this gallery. With best regards M. Zubrik