How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Western grapeleaf skeletonizer

The western grapeleaf skeletonizer has three generations per year in the Central Valley and two generations in the cooler coastal regions. Adults of the first generation in the Central Valley emerge from hibernating pupa in early spring to June. The pale yellow or whitish capsule-shaped eggs are laid in clusters on the underside of grape leaves. After hatching, the larvae line up and feed side by side on the leaf underside until the early fourth instar stages. There are five larval stages. When mature, larvae crawl under the loose bark or into ground litter and spin a dirty, whitish cocoon to pupate.

Eggs
Eggs
Hatching larvae
Hatching larvae
3rd instar larvae
3rd instar larvae
4th instar larvae
4th instar larvae
Skeletonizer cocoons
Skeletonizer cocoons
Adult moths
Adult moths

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/GARDEN/FRUIT/PESTS/LIFECYCLE/lcwesgrskelet.html revised: January 8, 2014. Contact webmaster.