Thorax is orange with three black dots. Adults and Damage. Life History Adult borers appear in early June. They girdle the tips of branches and deposit their eggs on the living twigs near the girdling. Eggs hatch and the larvae enter the twig and bore down the center.
Damage usually causes death to branches and ruins the appearance of shrubs or trees.
The larvae overwinter in the stems. In spring some larvae pupate while others continue to develop into the second year. Those pupating emerge by mid May or early june. One generation per year. Larvae or pupae overwinter.