Leafrollers

    Leafrollers

    Oblique banded leafroller adult. Oblique banded leafroller adult.

    Leafroller damage.
    Leafroller damage.

    HOSTS

    • All fruit trees, especially cherry

    DESCRIPTION

    A caterpillar or pupa inside a folded leaf tied with silk is most likely a leafroller. Leafrollers are moths whose larvae (caterpillars) feed on leaves and in some cases, on the surface of fruits. This pest is not a concern for backyard trees.

    BIOLOGY

    Leafrollers (obliquebanded being the most common in Utah) are minor pests of all fruit trees. Depending on the species, they overwinter as pupae or eggs and emerge in spring. Only the obliquebanded leafroller has more than one generation. In Utah, leafrollers are primarily a concern for cherry growers. The larvae do not directly feed on the fruit (they prefer the leaves), but as cherries are harvested, they can fall into the bins, contaminating the crop. Leafroller larvae have become more of a problem with the switch away from Guthion for cherry fruit fly control.

    SYMPTOMS

    • Rolled, chewed leaves
    • Dimpling or scarring on fruit

    GENERAL MANAGEMENT

    Leafrollers are often suppressed by insecticides that control codling moth or other caterpillar pests. Microbial insecticides, such as Bt and spinosad, are very effective in killing leafrollers.

    Monitoring:

    Look for rolled leaves at shoot terminals starting in late May.

    Insecticides:

    • Residential: dormant oil° alone or with malathion, permethrin, or gamma-cyhalothrin
    • Commercial: click here

    Precautionary Statement: Utah State University and its employees are not responsible for the use, misuse, or damage caused by application or misapplication of products or information mentioned in this document. All pesticides are labeled with ingredients, instructions, and risks, and not all are registered for edible crops. “Restricted use” pesticides may only be applied by a licensed applicator. The pesticide applicator is legally responsible for proper use. USU makes no endorsement of the products listed in this publication.