Pest description and damage Cherry bark tortrix is a pest of most woody ornamental trees and shrubs in the family Rosaceae, but cherry is the preferred host. The larvae are 0.33 to 0.4 inch long, pale gray to flesh-color with small, pale gray spines scattered on the surface, with a yellowish-brown head. Larvae feed directly on the cambium beneath the bark of the tree. Extensive feeding may cause death of the tree. Otherwise, the feeding activity decreases the supply of nutrients to the tree and increases tree susceptibility to disease, insect attack, and environmental stress, including cold injury. The first indication of attack is the reddish-brown gum-like resin, mixed with fecal pellets and silk, that flows from the bark. The trunk and larger limbs of bearing fruit trees are affected, usually at pruning wounds and graft unions.
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