This is the most serious insect pest of black locust. It provides infection courts for the fungus, Fomes rimosus, which causes substantial defect, growth loss, and some mortality. The only host is black locust. Identifying the Insect.
Legs are yelloworange and long.
Identifying the Injury. The first sign of attack occurs in the spring, around the time of bud burst. Oozing sap at the point where the larva bores into the tree causes a wet spot on the bark. Eventually, the larva begins to tunnel into the wood, pushing granular frass out of the entry hole. Sometimes stems are so weakened that they become windbroken.