Adults first feed on developing buds, flowers, shucks, and setting fruit.
Egg-laying scars are the most common injury and will be most easily found on fruit from outside rows near overwintering sites. First brood larval injury will cause fruit drop. Second brood injury will usually not cause drop, but will provide a wounded fruit source for brown rot and other diseases to develop. Monitoring can be done with a beating tray by holding a large square yard cloth beneath the tree and beating on a branch three times with a rubber mallet or rubber-wrapped stick. Fruit should also be examined by counting a minimum of 200 fruit per block for egg-laying scars or feeding injury.