How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Harlequin bug

Drum-shaped eggs with circular "lids" are laid in clusters on foliage. The nymphs, nearly round and often brightly colored, remain close together at first but scatter as they grow. They pass through four or five molts, gradually developing wings and adult coloration. Adults overwinter on the ground under leaves and become active in March or April. Stink bug infestations originate when adults fly in from weedy areas, often from the edges of sloughs and creeks where blackberries grow. Damage is often limited to the edges of fields near these areas, but in years with a lot of spring rain and late weed growth, stink bugs may be numerous and damage more widespread.

Harlequin bug egg mass
Harlequin bug egg mass, nymphal stages, and adult

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2016 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/VEGES/PESTS/LIFECYCLE/lcharlequin.html revised: August 11, 2016. Contact webmaster.