Environ. Horticulture, Pears, Cherries, and Viticulture
University of California
Environ. Horticulture, Pears, Cherries, and Viticulture

Brown Marmorated Stink Bug

This site contains a collection of information about the Brown marmorated stink bug in Sacramento County. Please use the links on the left to view the details.


Brown Marmorated Stink Bug (photo:njaes.rutgers.edu)

Brown marmorated stink bugs (BMSB) (Halyomorpha halys) were found in Midtown Sacramento in September 2013 as a large existing population. It was the first reproducing population in California outside of Los Angeles County, but now they are found in urban areas of eight other counties. In Sacramento County, reproducing populations can now also be found in many areas (see BMSB Finds link on left). Finds in the Sacramento Delta area: 1 in Oct. 2015 (Freeport), 5 in June 2016 (Clarksburg), 3 in Oct. 2016 (Freeport). The extreme heat in 2017 led to none found in the Delta in 2017. The first orchards in California infested with BMSB were reported in Stanislaus County in 2017 (click here). To see the new Journal of Economic Entomology article of research results for Sacramento 2014-2017, click here.

This insect, about 1/2 inch (males) to 5/8 inch (females) in length, is a strong flyer and excellent hitchhiker so it will only be a matter of time before it spreads farther.

Selected Resources


NEW ARTICLE FROM SACRAMENTO RESEARCHIngels, C. and K. Daane. 2018. Phenology of brown marmorated stink bug in a California urban landscape. J. Econ. Ent. https://doi.org/10.1093/jee/tox361

Fact Sheet (PDF 600kb) - Identification, damage, and tree hosts - July 2015 (UC ANR)

Pest Note - Management of BMSB in Homes and Gardens (UC IPM)

Pest Alert - Brown Marmorated Stink Bug Identification (UC IPM)

Article - Excluding Seasonal Nuisance Pests on Structures (UC IPM)

Presentation (PDF 1.2MB) - Overwintering Pests--Control Strategies (National Pest Management Association)

News Release - September 18, 2013 (UC ANR)


Chuck Ingels' BMSB Presentations


Video - BMSB Control: Keeping Stink Bugs Out of Your House (University of Maryland Extension)

Video - Compare BMSB with Consperse Stink Bug (UC ANR)

Streaming - Presentation on BMSB (Tracy Leskey, USDA)


StopBMSB.org - National BMSB web site

Map - BMSB populations in the US (stinkbug-info.org)

BMSB in California Agriculture - (UC ANR)


Translation into Portuguese (homeyou.com, Brazil)

Webmaster Email: cesacramento@ucdavis.edu