Brown Marmorated Stink Bug Identification

The Brown Marmorated Stink Bug (BMSB) is an invasive, shield-shaped insect that aggregates on and inside buildings, especially in fall. While primarily a nuisance invader, it carries export and compliance significance for some shipping and storage programs.

Quick Identification

• Brown, mottled (marmorated), shield-shaped body ~17 mm
• Alternating light and dark bands on the antennae
• Light/dark banding along the edge of the abdomen
• Emits a pungent odor when disturbed or crushed

Where We See It

• Building entry points – windows, doors, vents, utility penetrations
• Warehouses and storage facilities
• Sunny exterior walls during fall aggregation
• Attics, wall voids, and overwintering sites

Life Cycle

• Overwinters as an adult inside structures
• Aggregates in fall seeking shelter from cold
• Eggs laid on plants during the growing season
• Multiple generations possible in warm climates

Why It Matters

• Large seasonal numbers create a major nuisance
• Odor and contamination concerns in food-adjacent areas
• Export/compliance relevance – presence can affect some shipping programs

Monitoring & Control

Exclusion is the priority – seal entry points, screen vents, and tighten door sweeps before fall aggregation. Monitoring and targeted exterior treatments reduce pressure, and interior vacuuming removes overwintering bugs.