As a newer invasive species from Asia, the stink bug doesn’t yet have any natural predators and can spread very rapidly. While they are primarily active in summer and fall, they often enter New England buildings to overwinter (the technical term for their hibernation). Sometimes, they find cool enough places in structures to successfully overwinter, but in the springtime, they warm up and wander around again, causing pest issues the following year. Other times, it is too warm for them to successfully overwinter, so they wander around structures and continue to be pests into the fall.
Brown marmorated stink bugs are shield-shaped with a brown spotty coloring. They have straw-like mouthparts used for sucking the juices out of fruits and vegetables. During their summer egg laying period, female stink bugs can lay dozens of eggs, by attaching them on the underside of plant’s leaves in a large mass. The eggs hatch a few days later and the immatures feed on the leaves, growing and becoming adults by fall.