Stink bugs overwinter inside. Once inside a building, they go into a state of hibernation where they wait for winter to pass. In late spring, they lay clusters of eggs in groups of about 25 on plant leaves. Adults are good fliers and in late summer, are often seen around outdoor lights. They enter through small openings around windows and doors during the early morning. There are no known natural enemies for these bugs in the US. They cause severe damage to plants, fruit trees and grain plants. The best control method is sealing openings on the exterior of houses like entry points around windows and doors and the lower areas of siding and eaves. Openings around air conditioner pipes, electrical outlets, window frames, ceiling fans, skylights, weep holes and ceiling light fixtures are also potential entry points. Ask about our All-in-One treatments that will help solve this problem plus prevent other pest problems. If stink bugs enter your home, it is not advisable to remove them with a vacuum. After a few travel down the vacuum hose, their smell can be quite noticeable and the hose most likely will need to be replaced.