Brown stink bug

📖Overview

Euschistus servus is a medium-sized stink bug native to North America. Adults are shield-shaped, brown and somewhat variable in colour, and both nymphs and adults feed by piercing plant tissue and sucking sap. They can cause damage to many crops including soybean, corn, cotton, peaches and various vegetables and fruits. When disturbed or crushed they release a characteristic pungent odor from glands on the abdomen. Adults overwinter in sheltered sites such as leaf litter, under bark, and occasionally inside buildings.

🔍How to identify a brown stink bug

Adults are shield-shaped and stout with a broad, rounded abdomen and clear segmentation at the rear. Typical adult length is about 11-15 mm. The overall colour is medium to dark brown and may include reddish or yellowish tones; the underside is lighter. Antennae have distinct segments but lack the prominent white banding seen in some invasive species. The scutellum (triangular plate on the back) is large but does not cover the entire abdomen.

1. Shield-shaped body typical of stink bugs, 11-15 mm long with a broad rounded abdomen.
2. Uniform medium to dark brown overall colour without the distinct white antenna banding of brown marmorated stink bug.
3. Large triangular scutellum on the back that does not cover the entire abdomen.
4. When handled or crushed emits a strong, pungent odor.

Lookalikes

↻Life cycle

1. 🥚

   Egg

   Females lay clusters of barrel-shaped eggs on the underside of leaves; eggs hatch in about 4-7 days depending on temperature.

2. 🐞

   Nymph (immature)

   Several nymphal instars follow; early instars are small and more brightly coloured, later instars resemble adults but lack fully developed wings. Nymphs feed on the same host plants as adults.

3. 🐞

   Adult

   Winged adults are reproductive and will overwinter in sheltered sites; they emerge in spring to resume feeding and reproduction.

🍃Diet and predators

🌱Effect on plants and gardens

Feeds on many crops and wild plants by piercing fruit, seeds or stems and sucking sap; causes fruit deformation, dimpling, discoloration, aborted or shriveled seeds, and reduced marketability of fruit and vegetables.

How to get rid of brown stink bugs

For homes: exclude them by sealing gaps around windows, doors, siding and utility openings; remove by vacuuming (empty bag outdoors) or sweeping — avoid crushing to prevent odor. For gardens: hand-pick or knock into a container of soapy water. For farms: monitoring with sweep nets, trap crops and targeted insecticide applications when populations exceed economic thresholds; biological control includes encouraging natural enemies (parasitoid wasps, predatory insects). Always follow label directions for any pesticide and consider integrated pest management.

📍Where and when to find it

On host plants (soybeans, corn, fruit trees, vegetables) feeding on fruit and seed structures; adults on building walls and window sills in autumn when seeking overwintering sites.

✨Fun facts

• Stink bugs get their name from glands on the abdomen that release a defensive, pungent odor when the insect is disturbed.
• Although considered pests in agriculture, stink bugs are part of a complex food web and support many predators and parasitoids.
• Adults overwinter in sheltered spots such as leaf litter and under bark, and occasionally move into houses and barns in autumn.

?Frequently asked questions

📷Photos of the brown stink bug