Brown Marmorated Stink Bug

Information on BMSB

The brown marmorated stink bug (or BMSB), scientific name Halyomorpha halys, is an invasive insect that has been spreading throughout California for the past 10+ years.

The adult BMSB is about 5/8 inch long, and marbled ("marmorated") brown with beige. It can be distinguished from other stink bugs of comparable size and color by the following characteristics: the antennae have two white bands; the forward edge of the head is blunt; the margin of the shoulder (thorax) is smooth; the legs are marbled brown with faint white bands; the membranous parts of the forewings have dark bands at the tip; and a banded abdominal edge is visible to the side of the wings. BMSB is commonly mistaken for other stink bugs

In Sacramento County, BMSB were first found in Midtown Sacramento in September 2013 and reproducing populations can now also be found in many areas. For information and resources in Sacramento County, please see Advisor Chuck Ingels' web pages at http://ccag-eh.ucanr.edu/Brown_Marmorated_Stink_Bug/.

In Yolo and Solano counties, I am interested in knowing when and where residents think they have found BMSB. To report a find, please complete this survey http://ucanr.edu/survey/survey.cfm?surveynumber=21733.

You can also bring the bug in person to my office. Place the bug in a sealed plastic bag or container and take it to:

UC Statewide IPM Program
2801 Second Street
Davis, CA, 95618