Adult green stink bugs are bright green with a narrow orange-yellow line bordering the major body regions. Adult brown stink bugs are shield shaped and dull, grayish-yellow with dark punctures on their backs. Length varies from 14 to 19 mm for green stink bug adults and 12 to 15 mm for brown stink bug adults.
Nymphs develop through five instars that resemble adults but aresmaller and oval.
Green stink bug nymphs are black when small, but as they mature, they become green with orange, black and pink markings. Brown stink bug nymphs are usually pale green. Green stink bug eggs are barrel-shaped measuring 1.4 x 1.2 mm. They are yellow to green, later turning pink to gray. Frank Suber, UGA eggs are white, kettle-shaped, and slightly smaller than those of the green stink bug.