Pest Library
Stink Bug
Stink bugs are shield-shaped brown or green insects about half an inch long that release a strong, lingering odor when crushed or vacuumed. In fall they aggregate on sunny exterior walls looking for overwintering shelter and slip into attics, wall voids and window frames.
Profile
- Scientific name
- Halyomorpha halys and related species
- Identification
- Broad shield-shaped body, mottled brown or plain green, with alternating light and dark bands on the antennae in the brown marmorated species.
- Typical size
- About 1/2 to 5/8 inch.
- Behavior
- Feeds on plants during the growing season, then aggregates on structures in fall and emerges on warm days in spring.
- Habitat
- Sunny exterior walls, attics, soffits, wall voids, window and door frames.
- Diet
- Plants, fruit and ornamentals — not structures or people.
- Lifecycle
- One or more generations per year, with adults overwintering in sheltered locations.
- Why it matters
- A nuisance and odor problem. Stink bugs do not bite, sting, reproduce indoors or damage structures.
- DIY considerations
- Interior sprays are largely ineffective for overwintering insects already inside voids. Sealing in late summer is the effective step.
- Professional considerations
- Service focuses on late-summer exterior treatment and exclusion at the openings these insects use.
Signs of activity
- Clusters on sunny south and west walls in fall
- Bugs at windows and light fixtures indoors on warm winter days
- Strong odor after one is crushed or vacuumed
- Bugs emerging from attic hatches and can lights
Prevention
- Seal gaps at window and door frames, soffits, and utility penetrations before fall
- Screen attic and gable vents
- Repair damaged screens and install door sweeps
- Remove them with a vacuum reserved for the purpose, or by hand, to limit odor
Sources
Related information
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