Their backs are roughened and have two prominent humps and two smaller humps. Adults damage fruit when their feeding and egg-laying causes scarred and malformed fruit. Adult damage also provides entry sites for fungal rots. Larvae tunnel and feed inside developing fruit. Most fruit infested early in the season drop prematurely.
Fruit infested later in the season are of no market value due to the presence of the grubs.
They become active shortly before peaches bloom. Adults fly to trees, mate, and lay eggs. Females deposit each egg in a hole under a crescent-shaped cut eaten in the fruit. Eggs hatch in about five days. Grubs feed in the fruit for eight to 22 days.