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Brown marmorated stink bug

Halyomorpha halys

Theresa Cira and William Hutchison

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

In comparison to native stink bugs, BMSB have these features (see Fig. 1):

T. Leskey, USDA ARS

Current U.S. Range, 2013 (click to enlarge)

brown marmorated stink bug

T. Cira, UMN

Figure 1. BMSB is known for its striped antennae, rounded shoulders, and banding on the abdomen.

Key facts for 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 (Fig. 2).

life cycle of the brown marmorated stink bug

W. Hershberger

Figure 2. The stages of BMSB.

What's all the stink about?

This species will feed on over 300 different species plants, including many fruits, vegetables, and row crops. The injury from their piercing-sucking mouthparts can lead to significant crop damage and severe economic losses.

To survive the winter, this insect must find shelter, often taking cover in houses, garages, or barns. They can become a nuisance in fall when many bugs can invade a home.

True to their name, stink bugs can stink. The smell of BMSB is slightly earthy, some say it resembles cilantro. This defensive liquid is secreted from the underside of their thorax when the stink bugs feel threatened.

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.

For more information on this species, visit

Help MN!

If you think you have found a brown marmorated stink bug contact the Minnesota Department of Agriculture's Arrest the Pest program

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