In the spring, they move back to the peaches around bloom time, mate, and begin to cut small flaps of peach skin, where they lay eggs. This accounts for the crescent or oval scar on the surface of the fruit. After hatching, the larvae feed inside the developing fruit. First generation larvae will cause the small peaches to drop off the tree. Peaches infested during mid-season will not drop from the tree.
Infested fruit tends to ripen a few days earlier than uninfested fruit.
However, when these peaches are cut open, one or more legless, white worms with brown heads will be found feeding inside the fruit. When mature, the larvae cut a hole in the fruit and drop to the ground and pupate in the soil. Adults emerge from the soil, move into the trees, and if fruit is present, start the process over. Also, pick up any dropped fruit and destroy it. If there is fruit on the tree during mid-June, apply two more insecticide sprays.