The larvae develop during the spring and summer and, according to the region, can pupate and produce a new generation. As winter approaches, the larvae enter into diapause in the small pupal chamber. Those which were unable to build this small chamber die before pupating which takes place end of March. The galleries are located principally in branches of a diameter of 3 to 4 cm as well as at the top of young trunks. Drilling galleries impedes the circulation of sap and brings about the death of the attacked plant or branch.
Attacks are more frequent on trees already weakened by drought, fungal diseases or pests.
The larva has prepared its pupa cell at the end of its gallery filled with dry frass. . A part of the bark has been removed to show the gallery, full of dry frass. .