Two-Spotted Stink Bug

The two-spotted stink bug is a predatory member of the stink bug family Pentatomidae, placed in the subfamily Asopinae, which includes several beneficial hunting species. Unlike the plant-feeding stink bugs most people are familiar with, this species is primarily carnivorous, feeding on the larvae and adults of other insects.

It is especially recognized for its role as a natural predator of the Colorado potato beetle, a well-known pest of potato and other nightshade-family crops, making it a beneficial presence in gardens and agricultural fields where it helps suppress beetle populations.

Its bold shield-shaped body with a bright, variable pattern of black, orange, red, or yellow makes it one of the more visually striking stink bugs encountered in vegetable gardens, and it is often noted by gardeners observing its predatory behavior firsthand.

• Shield-shaped body about 8–11 mm long, broad and flattened with the classic stink bug outline.
• Base color is typically orange, red, or yellow, overlaid with bold black markings, including two prominent black spots on the pronotum that give the species its common name.
• Coloring can be quite variable between individuals, ranging from mostly black with orange trim to mostly orange with black spots.
• Piercing mouthparts are proportionally long and curved, an adaptation for predatory feeding rather than plant sap extraction.
• Distinguished from plant-feeding stink bugs by its association with prey insects such as beetle larvae, its more elongated beak, and its habit of being found near infested foliage rather than simply resting on leaves.

This species is found across much of North America, particularly in agricultural and garden settings where potato, tomato, eggplant, and other nightshade-family plants grow, since these host the beetle larvae it preys upon.

It is active during the warmer months, coinciding with the presence of its beetle prey, and can be found on the foliage of host plants in vegetable gardens, farm fields, and occasionally on other flowering plants where prey insects are available.

The two-spotted stink bug is an active predator, using its long, curved mouthparts to pierce and feed on the larvae and adults of various insects, most notably the Colorado potato beetle. Both nymphs and adults hunt, making the species beneficial throughout its life cycle.

Like other stink bugs, it can release a defensive odor when disturbed, and its piercing mouthparts, adapted for subduing prey, mean it can bite in defense if handled. Within its ecosystem it functions as a natural check on beetle populations, contributing to biological pest suppression in gardens and fields.

Development occurs through incomplete metamorphosis, with egg, several nymphal instars, and adult stages and no pupal phase. Eggs are laid in clusters on host plant foliage, often near colonies of prey insects, and the predatory nymphs begin hunting soon after hatching.

There are typically one to two generations per year depending on region and prey availability. Adults overwinter in sheltered locations such as leaf litter or plant debris, emerging in spring to resume hunting as beetle populations become active on host plants.