The brown marmorated stink bug originates from Asia. The adult bugs become active in spring when the temperature exceeds 10 °C. The females lay an average of more than 200 eggs until late summer. The egg clutches are located in groups of 20 to 30 eggs on the underside of the leaves of their more than 100 host plant species. After only a few days, the larvae (nymphs) hatch and like to stay in groups on the plants. In warm years, two generations of the brown marmorated stink bug may develop.
In the fall, they leave their host plants in search of overwintering quarters, liking to congregate in larger numbers in sunny places, such as on house facades and windows. They overwinter in protected areas, such as garden sheds and houses.
