Identifying the Injury. Short, vertical egg galleries with radiating larval galleries etched in the sapwood are good indicators of damage. Twenty to 60 eggs are deposited in egg galleries in the phloem. When nearly fullgrown, the larvae gradually angle away from the adult gallery. Before reaching maturity, they leave the phloem to pupate in the bark.
Winter is spent in the larval stage and pupation occurs in the spring.
There are usually two generations each year in the southern United States. Egg gallery and larval mines. Photo by James Solomon Control. Insecticides can also be used.