How to Manage Pests

Pests in Gardens and Landscapes

Grape bud beetle—Glyptoscelis squamulata

Adult grape bud beetles are about 6 to 10 mm long and 5 to 6 mm wide. Young adults are normally covered with light gray scales. Older adults assume a dark brown color where scales have been removed and a light gray color where scales are still present. Larvae are whitish gray with the last larval stage slightly larger than adults.

Life cycle

Damage

Adult beetles cause fruit loss by feeding on opening buds and eating the bud center, which contains immature leaves and flower cluster primordia.

Solutions

Hand pick beetles off vines and prune off damaged shoots. When shoots are 1 to 1.5 inches long, feeding damage is negligible and beetles no longer need to be controlled.

Grape bud beetle adult and eggs
Grape bud beetle adult and eggs

Bud center eaten by adult beetle
Bud center eaten by adult beetle


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/grapebdbeet.html revised: April 25, 2014. Contact webmaster.