Entity scope
This profile covers common shield-shaped bugs called stink bugs, including plant-feeding and predatory species.
Quick identity
- Scientific scope
- Pentatomidae and related shield bugs
- Entity scope
- Practical shield-bug group
- Broad form
- Broad shield-shaped true bugs with a triangular scutellum; markings vary widely.
- Useful clue
- Odor may be released when disturbed, but smell is not species-specific.
- Typical context
- Crops, gardens, trees, weeds, buildings, or prey-rich vegetation depending on species.
- Identification limit
- One organism, symptom, or photograph is not enough for reliable species certainty.
Key characteristics
- Broad shield-shaped true bugs with a triangular scutellum; markings vary widely.
- Odor may be released when disturbed, but smell is not species-specific.
- Host and habitat context matter: Crops, gardens, trees, weeds, buildings, or prey-rich vegetation depending on species.
- Color, size, and plant injury can overlap with unrelated organisms; preserve uncertainty when views are incomplete.
Where it is found
- Crops, gardens, trees, weeds, buildings, or prey-rich vegetation depending on species.
- Plant feeders pierce fruits or seeds; predators attack arthropods; some overwinter in buildings.
- Regional range and seasonal timing affect which species are plausible.
Behavior and activity
- Plant feeders pierce fruits or seeds; predators attack arthropods; some overwinter in buildings.
- Visible abundance can change with weather, plant condition, natural enemies, and life stage.
- Plant damage without the organism present does not establish the cause.
Diet and resources
- Plant or habitat relationship: Crops, gardens, trees, weeds, buildings, or prey-rich vegetation depending on species.
- Resource use varies within broad groups and should not be generalized beyond this entity scope.
Associated signs
Fruit dimpling, feeding punctures, or indoor aggregations need the insect present for attribution. These signs also have other pest and non-pest explanations.
Common lookalikes
More elongate cucurbit feeders.
Usually elongate and may have expanded hind tibiae.
Beneficial species can resemble plant pests.
Why it matters
Identity and impact are separate questions
Some species damage plants or become nuisances, while others are beneficial predators. Group identity does not establish harm.
- Do not infer the responsible species from damage alone.
- Assess current activity, affected area, plant health, and change over time before deciding whether action is warranted.
Management direction
- Photograph dorsal and underside markings where safe.
- Determine whether the species is plant-feeding, predatory, or overwintering.
- Use species- and crop-specific guidance after narrowing identity.
Have a pest photo to check?
Start a new photo identification. This Profile gives comparison context; it does not transfer certainty or diagnose your image.
Identify a photoReviewed guidance and sources
Last reviewed August 2026. Sources support the claims listed with them; their limits remain part of the review.
- University of Minnesota Extension — Brown marmorated stink bug
Supports: One important species, shield-bug traits, feeding, and seasonal entry.
Does not support: Universal appearance for all stink bugs.
Scope note: North American garden and landscape context; species, hosts, seasons, and local guidance vary.
- University of Kentucky Extension — Stink bugs
Supports: Pentatomid form, plant-feeding and predatory roles.
Does not support: Species identity from odor or silhouette.
Scope note: North American garden and landscape context; species, hosts, seasons, and local guidance vary.