They feed on birch leaves for several days before laying eggs under bark and in cracks in the bark. The larvae burrow directly through the bark into the cambium layer. Heavy infestations cause raised burrows that can be detected on the bark surface. Adults prefer weakened trees for egg laying. Healthy, vigorous trees usually are less likely to be infested.
Cultural practices are very important in the prevention of bronze birch borer injury.
They are best suited for shaded, damp situations and should be watered regularly. Plant a ground cover over the root area to keep roots cool and moist. They emerge from infested stems in May and June. The adult females deposit eggs on the lower portions of the main stems of lilac or privet. The caterpillars bore into and feed within stems.