Damage to foliage is unimportant. Damage to fruits occurs at three different times during fruit development:
Overwintered larvae
- Feeding cavities in the receptacle of flowers and young fruitlets later heal to form corky scars characteristic of early caterpillar feeding on mature fruits.
First generation larvae
- Young caterpillars make small, shallow holes in the skin of fruits in July and early August.
- Larger caterpillars graze shallow irregular patches in the skin, especially at the point where fruits are in contact.
Second generation larvae
- Damage is similar to that caused by first generation larvae but occurs in late August and September and appears more freshly formed and may be in progress at harvest.