Proteoteras willingana

Contarinia negundinis

Callirhytis quercuspunctata (agamic)

Callirhytis quercuspunctata (sexgen)

Proteoteras willingana 

The boxelder twig borer, P. willingana (Kearfott), attacks boxelder and maple in many of the Northern and Midwestern States and southern Canada. The larva destroys dormant leaf buds in the fall and early spring. Later in the spring, it burrows in succulent twigs (fig. 55). causing the formation of spindle-shaped galls (982). These galls become woody when they dry out. This usually prevents further terminal growth. Severe damage has been recorded in shelterbelt plantings in the Prairie Provinces of Canada. 

Contarinia negundifolia Felt, the boxelder gall midge, produces fleshy galls on the leaves of boxelder. It has been recorded from Virginia, the Lake States, and the Prairie Provinces of Canada (1326). 

Callirhytis quercuspunctata (Bassett), the gouty oak gall, occurs from southern Canada to North Carolina and west to Illinois. It induces galls (fig. 202) on the twigs and smaller limbs of scarlet, pin, and black oaks. These galls are about 12 to 38 mm long and they frequently occur so close together that they form practically continuous masses. C. quercuspunctata has alternate generations. The first induces small blisterlike galls on the leaves near the veins in the spring. The second induces gouty galls during the summer. In heavy infestations, twigs, fairly large branches, and even entire trees may be killed. Shade trees are especially subject to damage.

Insects of Eastern Forests