Brown Marmorated Stink Bug

Brown Marmorated Stink Bug found in Massachusetts (March 2007) click here for details

(Click on an image below to see the captioned full-size version)
Figure 1		Figure 2		Figure 3		Figure 4		Figure 5		Figure 6

Scientific Name: Halyomorpha halys
Common Name: Brown Marmorated Stink Bug, Yellow-Brown Stink Bug, East Asian Stink Bug

Known Hosts:
The Brown Marmorated Stink Bug feeds on a wide variety of shade and fruit trees, vegetables and legumes. Reported hosts include apple (Malus domestica), peach (Prunus persica), pear (Prunus pyrifolia), citrus, figs (Ficus), mulberries (Morus), soybean (Glycine max), butterfly bush (Buddleia), Paulownia sp. and some some weeds such as burdock (Articum sp.)

Key ID Features (Adults, Larvae, Eggs):
	Adults emerge from overwintering in April.
	Adults are about 3/4 inch (14-17mm) in length. They are shield shaped and dark "marbled" brown in color. The antennae have an alternating dark and light pattern. The rear edges of the abdomen have alernating white and black markings.(Figure 1)
	Eggs are laid on the underside of leaves in clusters of 20-30 from June to August. Eggs are elliptical and light green in color. (Figure 2)
	This insect has 5 nymphal instars (immature stages) before reaching adulthood. Nymphs have bright red eyes. The first instar is very small (2.4 mm) and has a yellowish red abdomen. By the fifth instar the abdomen has progressed to a off-white color with reddish spots. (Figures 3 and 4)
	Flight of adults to overwintering spots begins at the end of September and peaks the third week of October. Adults can become a nuisance during this time when large numbers of them congregate on and invade buildings in search of overwintering sites.

Description of damage:
	Small necrotic areas on the outer surface of fruits and leaves.
	Cat-facing on fruits such as apple and peach.
	"Stippled" areas, roughly circular and 1/8 inch wide, have been observed on Paulownia and butterfly bush (Buddleia). (Figure 5)

Similar species or symptoms:
The western conifer seed bug is also known to invade homes in the fall. This species could be confused with the brown marmorated stink bug. One distinguishing characteristic of the western conifer seed bug is the flattened, leaf-like expansion on the hind legs. This fact sheed provides more information on the western conifer seed bug: http://www.ento.psu.edu/extension/factsheets/western_conifer_seed_bug.htm
This insect does not harm people. The best control is preventing its entrance to your home by caulking gaps around windows and doors and screening openings to the outside such as fireplace chimneys, attic and wall vents.
Rutgers has photos posted of insects similar in appearance to H. halys.
http://njaes.rutgers.edu/stinkbug/similar.asp
Stink bugs in the genus Brochymena are also similar to H. halys. Brochymena do not have alternating light and dark markings on the antennae and the margins of the pronotum (the structure behind the head) are strongly "toothed" as compared to the smooth margins of Halyomorpha halys. (Figure 6)

Fact sheets and references:
Forest Health Fact Sheet- Brown Marmorated Stink Bug
http://www.dcnr.state.pa.us/forestry/leaflets/stinkbug.htm

E. Asian stink bug infesting homes in Allentown Pennsylvania, PA
Cornell Chronicle Nov. 1, 2001
http://www.news.cornell.edu/chronicle/01/11.1.01/stinkbugs.html

Rutgers Cooperative Extension Monitoring for the Brown Marmorated Stink Bug
http://njaes.rutgers.edu/stinkbug/default.asp

Hamilton, G.C. and P.W. Shearer. 2003. Brown Marmorated Stink Bug- A New Exotic Insect in New Jersey. Rutgers Cooperative Extension.
http://njaes.rutgers.edu/pubs/publication.asp?pid=fs002

Hoebeke, E.R. 2002. Brown Marmorated Stink Bug, Halyomorpha halys. Regulatory Horticulture. 28: 35-37.
http://www.agriculture.state.pa.us/agriculture/lib/agriculture/plantindustryfiles/reghort_vol28_2002.pdf

Jacobs, S.B. and K. Bernhard. 2002. Yellow-Brown Stink Bug. Penn State Entomological Notes
http://www.ento.psu.edu/extension/factsheets/brownMarmoratedstinkbug.htm

Oregon Department of Agriculture Pest Alert: Brown Marmorated Stink Bug
http://egov.oregon.gov/ODA/PLANT/docs/pdf/ippm_halyomorpha.pdf

Northeast IPM Center Pest Alert: Brown Marmorated Stink Bug
http://www.csrees.usda.gov/nea/pest/pdfs/stink_bug_pest_alert.pdf

last reviewed February 25, 2008