Brown marmorated stink bugs are master home invaders. Particularly in winter, when they seek shelter from the cold, if a structure has a gap or entrance large enough to fit through, they will find it. A new study by researchers at Virginia Tech and the US Department of Agriculture shows that slits less than 3 millimeters wide and holes less than 7 millimeters wide should successfully exclude the vast majority of brown marmorated stink bugs. (Photo credit: Mohammed El Damir, Bugwood.org)