Bronze Birch Borerby mrgadmin on April 22, 2023

The larva bore into the phloem and cambium layers after emerging from their eggs on the bark. The borers’ tunneling weakens and kills trees by interrupting the flow of sap.

Common symptoms are death of the leader, canopy thinning and dieback in the top of the crown and raised, horizontal and zigzag ridges in bark.