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Pest Library · Seasonal invadersBrown Marmorated Stink Bugs Identification Guide
How to identify brown marmorated stink bugs, an invasive pest that moves into Ontario homes every fall.
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How to identify
What stink bugs look like
Brown marmorated stink bugs are shield-shaped with mottled brown backs and light bands on the antennae and along the edges of the abdomen.
They release a strong odour when crushed or disturbed.
Signs you have stink bugs
- Shield-shaped bugs gathering on walls in fall
- Bugs appearing indoors on warm days in winter and spring
- A strong, unpleasant odour when disturbed
Are they dangerous?
They do not bite or damage homes, but they are an invasive agricultural pest and a strong nuisance indoors.
How to prevent them
- Seal cracks and gaps before September
- Repair window and door screens
- Vacuum indoor bugs instead of crushing them
Quick facts
Scientific nameHalyomorpha halys
Size14–17 mm
ColourMottled brown, shield-shaped
Most activeFall and spring
Found inWalls, attics, windows
Risk levelLow (nuisance, odour)
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