When first detected in western Maryland in 2003, most people had never heard of the brown marmorated stink bug (BMSB), also known as Halyomorpha halys. This newcomer is thought to have been accidentally introduced from Asia into the Allentown, PA area during the mid 1990s. Since that time, populations have soared in the mid-Atlantic states, resulting in extensive crop damage. The BMSB is also attracted, often in large numbers, to buildings because they provide safe winter hiding spots. It is expected that the range of this invasive pest will grow. Within a few years, New Yorkers could be dealing with large numbers of BMSBs. This fact sheet provides tips for dealing with structure-invading BMSBs.