Green Stink Bug

The Green Stink Bug is a common true bug in the family Pentatomidae, the stink bugs, named for the shield-like shape of its body and its ability to release a pungent defensive odor from glands on the thorax. It is one of the most frequently encountered stink bug species in gardens and agricultural settings across North America.

As a member of the order Hemiptera, it feeds by piercing plant tissue with a needle-like mouthpart and withdrawing sap, a feeding style shared by all true bugs. It is considered agriculturally notable because of its habit of feeding on developing fruits, seeds, and pods of many cultivated and wild plants.

The species is part of a broader stink bug guild that plays a role in plant sap cycling and is, in turn, preyed upon by birds, predatory insects, and parasitic wasps, forming part of the food web in gardens and farmland.

• Broad, shield-shaped body, wider at the shoulders and tapering toward the rear.
• Solid bright to dull green coloration across the entire body, sometimes with a narrow pale border along the edges.
• Piercing-sucking mouthparts folded beneath the body when not feeding.
• Wings held flat over the back, with a triangular scutellum (shield plate) visible at the base.
• Lookalikes: closely resembles the Southern Green Stink Bug and other green pentatomids; subtle differences in the edge markings and shoulder shape help distinguish species.

Found throughout much of North America, the Green Stink Bug is common in gardens, orchards, row crops, and along field edges wherever host plants such as beans, tomatoes, and various fruit trees grow. Adults and nymphs are active from late spring through fall, seeking shelter under leaf litter or bark as temperatures drop.

Both nymphs and adults feed by piercing plant tissue, particularly developing fruit, seed pods, and stems, to withdraw plant fluids. When disturbed, they release a strong-smelling defensive compound from thoracic glands, a behavior shared across the stink bug family. They are relatively slow-moving and often first noticed clustering on fruiting plants or window screens as they seek shelter in cooler months.

Green Stink Bugs undergo incomplete metamorphosis. Eggs are laid in tight, barrel-shaped clusters on the underside of leaves, hatching into nymphs that resemble small, rounder, often patterned versions of the adult. Nymphs pass through five instars, gradually developing wing pads and adult coloration, before molting into full winged adults. Depending on climate, the species can produce one to two generations per year, with adults overwintering in sheltered leaf litter or structures.