PestDex Details
Brown Marmorated Stink Bug
Halyomorpha halys
crawler
Invasive fall home invader from Asia. Nuisance pest that clusters indoors seeking warmth.
How to Identify
- •Mottled brown shield shape, ⅝ inch
- •White bands on antennae
- •Alternating light/dark bands on abdomen edge
- •Foul odor when crushed or threatened
Where Found
Overwinters in attics, wall voids, window frames. Feeds on fruit trees and gardens spring/summer. MD/VA/DC suburban homes see heavy fall invasions.
Seasonality
Enters homes September–October. Emerges from hiding March–April to return outdoors.
Health & Property Risk
Nuisance and odor. No health threat or structural damage. Stains fabrics if crushed. Damages fruit crops outdoors.
Prevention Tips
- •Seal cracks around windows and siding in August
- •Repair torn screens
- •Caulk gaps around utilities and trim
- •Remove window AC units in fall
- •Vacuum up (dispose of bag outside)
Treatment Notes
Perimeter spray in late August before migration. Vacuum removal indoors. Avoid crushing. Light traps can reduce numbers. No indoor spray needed — they don't breed indoors.