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Brown marmorated stink bug

Quick facts

Brown marmorated stink bug is an invasive species. 

  • They feed on over 300 different plant species, including many fruits, vegetables and row crops.
  • They can carry diseases.
  • They shelter for the winter in buildings, including homes in urban areas.

The Minnesota Department of Agriculture monitors this invasive species. Please report any BMSB you spot at Arrest the Pest

The brown marmorated stink bug (Halyomorpha halys) is not native to the United States. In the mid-1990s, 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)

  • Adults are shield shaped, mottled brown in color, and have a smooth rounded shoulder, alternating dark and light bands on their antennae and abdomen and iridescent green or gold pits on their undersides.
  • Newly hatched nymphs have a yellow-red abdomen.
  • Older nymphs are darker in color.
  • Brown marmorated stink bug gives off an unpleasant odor when disturbed or crushed.
Brown marmorated stink bug nymphs
Adult brown marmorated stink bug

Life cycle of BMSB

  • Adults deposit egg clusters on the undersides of leaves from May to August.
  • Eggs are very small and light green in color.
  • Nymphs mature into adults during summer and overwinter as adults.
  • There is one generation per year.
The stages of BMSB

Damage caused by stink bugs

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.
  • They give out an earthy odor that smells like cilantro when they are disturbed or crushed.
  • They release this defensive liquid from the underside of their thorax (the part between the neck and abdomen).

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.

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

Download the app

A free Midwest Stink Bug Assistant app has been developed by the University of Minnesota Extension IPM Program, the Minnesota Invasive Terrestrial Plants and Pests Center, and Purdue University. The app is available for both Apple and Android.

The Midwest Stink Bug Assistant helps with early detection and reporting of the invasive brown marmorated stink bug. Users can identify native stink bug species common to the Midwest region and distinguish stink bugs from other bugs.

William Hutchison, Extension entomologist and Theresa Cira

Reviewed in 2018

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