Bronze Birch Borer
The Bronze Birch Borer is a wood-boring beetle which attacks all birch species. The adult is a copper/bronze colored slender beetle. The larva, which does the damage, is unseen. It feeds on the vascular tissue under the bark. The Bronze Birch Borer normally attacks trees which are already stressed or declining. A birch infested with Bronze Birch Borer will start showing dieback at the top of the tree, and will eventually extend to the major branches and main stem. Emergence holes may be seen on infested branches and trunks .