The mature larva is about an inch long and has a green body and black head. Moths fly during May or June, depending on the locale. The flight lasts about 3 weeks and females lay overwintering egg masses mainly on twigs in the upper parts of trees. There is one generation per year. The fruittree leafroller feeds principally on leaves, but also feeds on flower buds, blossoms, and fruits.
Tiny larvae work their way into opening leaf buds to feed.
Once the tree has leafed out, larvae tie up leaves and live within leafrolls, feeding on leaves or fruit. Larvae damage fruit in much the same way as green fruitworms, causing shallow cavities. Fruittree leafroller usually is effectively controlled by a delayed dormant oil spray. Make an application thorough enough to cover egg masses. Examine 100 fruit clusters collected randomly per block.