White, flat head. Larvae tunnel canes, causing spindle shaped swellings on surfaces. Eastern half of United States. Adults emerge from canes in late spring.
Females lay eggs on bark or inside new growth canes in late spring.
Galls form where eggs are inserted or canes may break at these junctions. Larvae hatch from eggs and enter canes through leaf axils, tunnelling through the sapwood to the hardwood, and, finally, the pith where the larvae stays through pupation until spring. Galls may appear in late summer where girdling has occurred. Cut out and destroy swollen, infested canes. Spray toward base of canes.