What is Birch Borer?
Bronze Birch Borer is a serious pest of Birch trees in the Midwest. It can severely injure or kill most birch species; European White Birch varieties are particularly susceptible.
What are the symptoms of Birch Borer?
The usual first sign of attack is a thinning or dieback of branches in the upper third of the tree. Leaves on the infested branches may be unusually small or may show browning along the edges in May or June. Larvae cause the damage by feeding under the bark and girdling the branches. Girdling prevents movement of food and water to tissues above the attack site. Extensive feeding may kill the branch by July or August.