Pruning is not effective if larger branches or the main trunk is already showing symptoms. Birch species vary in susceptibility to birch borer attack. Generally the river, or red birch is more resistant than the other species. The European weeping white birch is the most susceptible. A healthy tree is the best control for bronze birch borer.
Birches grow best in cool, moist, shaded locations.
A birch tree planted in an open sunny exposed area may lose vigor and become weakened allowing the borers to become established. A healthy vigorous tree is much less susceptible to attack. Adult borers prefer to lay eggs on trees that are in full sunlight. The best way to prevent birch borer attack is to plant the birch in a cool, moist, shady location and to keep it healthy by watering and fertilizing when needed. Good planting sites include the edge of shrubby or natural area where ground covers, low shrubs or leaf mulch are present.