The brown marmorated stink bug, 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. Stink bugs began arriving in our area about 5 years ago.
Adults will emerge from homes and other warm structures sometime in the spring of the year (late April to mid-May), then mate and deposit eggs from May through August on the leaves of bushes , trees and flowers. The eggs hatch into small black and red nymphs that go through five molts. Adults begin to search for overwintering sites starting in September through the first half of October.
At this point in time treatments are preventive. We spray the leafy vegetation , and exterior surfaces of the house in the spring and late summer/early fall. The spring spraying stops them from reproducing around the house. The August spray is to reduce their numbers and cut down on their getting inside to overwinter. We can only cut down , not totally eliminate them.