Apple-Apple-and-thorn skeletonizer

Choreutis pariana

Pest description and crop damage Adult moth is reddish brown, with a wingspread less than 0.5 inch, and irregular light and dark bands on the wings. Larvae are 0.5 inch long, yellowish to greenish, with black spots and a yellow-brown head. Pupae are yellow to brown with a white silken cocoon. Larvae skeletonize and roll leaves. Damaged leaves are brown and papery and drop prematurely. They feed on apple, crabapple, cherry, and hawthorn.

Biology and life history Adult moths overwinter in crevices in the tree. They lay eggs in small bunches on the undersides of leaves. The larvae emerge and feed on the underside of the leaves. They then move to the top surface and feed there, often tying the sides together creating a "rolled" effect. There is often more than one caterpillar in the roll, and the leaf ends up skeletonized. After 3 to 4 weeks, they pupate in the rolled leaf. Adults emerge after about 2 weeks to start a new generation. There are at least two generations per year.

Scouting and thresholds Watch for signs of skeletonizing, which from a distance looks like the leaf tips have been burned.

Management-biological control

There are many natural enemies of this pest. Avoid broad-spectrum sprays that would disrupt this system.

Management-cultural control

Larvae and pupae are easily removed from rolled leaves. Remove heavily infested twigs.

Management-chemical control: HOME USE

  • No chemicals are labeled for specific control of this pest.

Management-chemical control: COMMERCIAL USE

Insecticides used for codling moth or apple maggot also control this pest.