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The Brown Marmorated Stink Bug

Halyomorpha halys

The brown marmorated stink bug (BMSB), an insect not previously seen on our continent, was apparently accidentally introduced into eastern Pennsylvania. It was first collected in September of 1998 in Allentown, but probably arrived several years earlier. As of September 2010, Halyomorpha halys has been recorded from 37 counties indicated in Figure 1, although it is probable that they are in all counties.

county map bmsb recorded sightings

Figure 1: PA counties with recorded presence of brown marmorated stink bug

It is also recorded from many other states such as those indicated in Figure 2.

State map bmsb recorded sightings by year

Figure 2: Year brown marmorated stink bug detected by state
source: G.C. Hamilton, Rutgers University

This true bug in the insect family Pentatomidae is known as an agricultural pest in its native range of China, Japan, Korea and Taiwan. Recently, the BMSB has become a serious pests of fruit, vegetables and farm crops in the Mid-Atlantic region and it is probable that it will become a pest of these commodities in other areas in the United States.

BMSB becomes a nuisance pest both indoors and out when it is attracted to the outside of houses on warm fall days in search of protected, overwintering sites. BMSB occasionally reappears during warmer sunny periods throughout the winter, and again as it emerges in the spring.

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