Brown Marmorated Stink Bugs

The Shield-Shaped Invader

The Brown Marmorated Stink Bug (BMSB) is an invasive species in Utah that causes headaches for gardeners in the summer and homeowners in the fall.

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Identification & Appearance

  • The ShapeThey have a classic "shield" shape, measuring about 1/2 to 3/4 inch long.
  • The Mottled LookTheir color is a marbled (marmorated) brown.
  • The "Checkered" EdgeA key ID feature is the alternating dark and light bands along the edges of their abdomen and on their antennae.
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Behavior: Where Do They Hide in Utah?

  • The Fall InfluxAs Utah temperatures drop in September and October, these bugs congregate on the sunny sides of homes. They look for any gap—around window frames, soffit vents, or siding—to crawl inside and sleep for the winter.
  • The DefenseWhen they are crushed or feel threatened, they release a pungent, foul-smelling chemical from glands on their abdomen.
  • The Garden ThreatDuring the spring and summer, they use their straw-like mouthparts to pierce and ruin Utah fruits and vegetables, particularly tomatoes, peppers, and apples.
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FAQS

Frequently Asked Questions

  • Will they bite my family or pets?No. They do not have biting or stinging mouthparts. They are strictly a "nuisance pest" when indoors.
  • How do I get them out without making my house smell?Do not swat or crush them. The best method is to gently scoop them into a jar of soapy water or use a vacuum (though the vacuum may smell temporarily).