They are usually quite active, sometimes moving backwards when disturbed. Symptoms of Damage Young larvae feed on unfolded leaves. Older larvae fold the leaves in half and hold them in place with webbing. Damage results from the larvae feeding within the folded, rolled or webbed leaves, causing them to turn brown and die. The fruit is rarely attacked.
Damage is usually minimal and most common on new plantings, late in the growing season.
Monitoring Monitoring should begin in the spring. Growers should look for folded or rolled leaves among the plants. The rolled leaves should be carefully picked, unrolled and examined for the small green leafroller larvae. If the rolled leaves do not have any larvae present, it is too late to control the larvae. Spraying would be ineffective and costly at this time.