Brown marmorated stink bug

Quick facts

  • It is an invasive species that can feed on over 300 different plant species, including many fruits, vegetables and row crops.
  • It looks for shelter to spend the winter.
  • This bug can become a nuisance in fall when many bugs can invade a home.

The brown marmorated stink bug (Halyomorpha halys) is not native to the United States. In the mid-1990's, it arrived undetected in a shipment from Asia.

The range of this bug is expanding across the U.S.

How to identify brown marmorated stink bugs (BMSB)

In comparison to native stink bugs, BMSB have these features:

  • Striped antennae.
  • Rounded shoulders.
  • Dark and light banding on the abdomen.
Eight stages of the life cycle of brown marmorated stink bug. It starts with tiny white eggs, brown bugs emerging from the eggs, and a brownish insect of increasing size at each stage.
The stages of BMSB

Life cycle of BMSB

  • Eggs are laid on the underside of leaves in late spring and early summer.
  • Five immature stages feed through the summer.
  • Adults are present late-summer through the winter and emerge in spring to lay eggs.

Damage caused by stink bugs

A grey brown insect with long, striped antennae
Brown marmorated stink bug

This invasive species can attack many crops.

  • The injury from their piercing-sucking mouthparts can cause significant crop damage and severe economic losses.
  • To survive the winter, this insect must find shelter in houses, garages, or barns.
  • Stink bugs can stink, giving out an earthy smell that resembles cilantro.
  • They release this defensive liquid from the underside of their thorax (the part between the neck and abdomen) when they feel threatened.

You can help monitor for BMSB

  • BMSB are spread with help from humans.
  • By hitchhiking on cars, trucks, campers, suitcases and even mailed packages, this bug can move from an infested area to an uninfested area very quickly.

If you think you have found a brown marmorated stink bug, contact the Minnesota Department of Agriculture's Arrest the Pest program arrest.the.pest@state.mn.us

For more information on this species, visit www.stopBMSB.org.

William Hutchison, Extension entomologist and Theresa Cira

Reviewed in 2018

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