How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Stink bugs

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.

Say stink bug eggs
Say stink bug eggs

Nymphs
Nymphs

Adult Nezara bug
Adult Nezara bug

Say stink bug nymph
Say stink bug nymph



Statewide IPM Program, Agriculture and Natural Resources, University of California
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