Insect Management Handbook

Lepidosaphes ulmi

Gracillaria syringella

Pest description and damage The adult insect is a mottled golden yellow moth about 0.5 inch in length. The larvae that mine within the leaf tissues are small, pale yellow to green caterpillars, 0.125 to 0.25 inch long. The larvae mine leaves during the early part of their development. Later, the larvae leave the mine, roll and tie together leaf tips to feed on the tissues within the rolled leaf.

Includes Parthenolecanium corni

Hyphantria cunea

Prionoxystus robiniae

Ash borer (Podosesia syringae)

Includes leafcurl ash aphid (Prociphilus fraxinifolii)

Pest description and damage Leafcurl ash aphids cause significant curling and twisting of ash leaves that provide protection for the greenish, 0.1-inch aphids covered with white waxy material. The consensus is that damage substantially disfigures leaves but does no lasting damage as the leaves continue to photosynthesize sugars for the plant.

Includes spruce spider mite (Oligonychus ununguis)

Includes

Black pineleaf scale (Dynaspidiotus [formerly Nuculaspis] californica)
Juniper scale (Carulaspis juniperi)
Pine needle scale (Chionaspis pinifoliae)

Includes

Black vine weevil (Otiorhynchus sulcatus)
Clay-colored weevil (Otiorhynchus singularis)
Woods weevil (Nemocestes incomptus)