The brown marmorated stink bug, or simply the Stink Bug, is an insect in the family Pentatomidae, and it is native to China, Japan, Korea and Taiwan. Stink bugs are named for the pungent smell they emit when frightened, disturbed or squashed. They have glands that produce a defensive compound, which has a strong odor that repels predators. It makes them particularly obnoxious.
The fall and the spring are when Stink Bugs are most active. In the fall, they are seeking shelter from the cold weather so they will find any cracks, crevices, or holes to get inside, similar to how Asian lady beetles and Box elder bugs invade houses. And while you may not see them all winter, once the spring season arrives, if you were hosting stink bugs, you will probably find them soaking in rays of sun from a windowsill.
While Stink Bugs do not harm humans or destroy your property, they are unsightly and produce a pungent odor when squashed.
Stink Bugs are relatively new to Wisconsin but have no real predators here. So, you can expect them to get worse and their numbers to increase with the lack of natural predators.
Don’t wait unit you see a lot of them before you call! Your best odds at favorable results is to beat the Stink Bugs to the punch!