Trees under stress are more susceptible to borer attack. It is imperative that susceptible trees receive yearly fertilization and frequent deep watering during dry periods to reduce stress and promote growth. Trunk injury by lawn mowers, etc. Mulching around the tree base eliminates the need for close mowing and potential trunk injury and retains soil moisture. BBB-infested fire wood should be burned before May to stop adults from emerging.
Chemical control is difficult once larvae have bored into the trunk.
The current strategy is to use foliar and bark insecticide sprays to control egg-laying adults or newly hatched larvae before they enter the bark. Apply the first spray thoroughly to the bark and foliage in early June when adults usually emerge. BLM control is important since this defoliator can cause severe stress and weakening. Occasionally aphids and other pests can also become numerous on birches. BBB Management Summary Fertilize annually and water regularly, especially during dry periods.