Missouri Pest Monitoring Network
Brown Marmorated Stink Bug I.D.
![Brown Marmorated Stink Bug](images/bmsbAdult.jpg)
Identification of adult
(one of two damaging stages as well as the stage most likely to be captured by traps; nymphs [= immature stages] can sporadically be captured in traps as well)
- 2/3 of an inch long and wide
- To distinguish them from other stink bugs, look for lighter bands on the antennae and darker bands on the membranous, overlapping part at the rear of the front pair of wings.
![Brown Marmorated Stink Bug under microscope](images/bmsbAdultID.jpg)
Identification of nymphs (one of two damaging stages)
![Brown Marmorated Stink Bug life stages from nymph to adult with circles pointing out their banded antennae, photo credit: Dr. Tracy Leskey, USDA-ARS](images/bmsbNymph.jpg)
- Five nymphal stages, or instars
- Nymphs are more brightly colored with red and black, unlike the adults who blend in very well with bark.
- The first instars, which have a "tick-like" appearance, are not very active and remain around the hatched egg mass.
- Characterized by dark reddish eyes and a yellowish-red abdomen that is also striped with black.
- Legs and antennae are black with white banding.
Identification of eggs
![](images/bmsbEgg.jpg)
- Eggs are white or pale green and are barrel-shaped (1.6 x 1.3 mm)
- Attached, side by side, to the underside of leaves in masses of 20 to 30 eggs.