Which winged insect smells like a bedbug? - briefly
The brown marmorated stink bug (Halyomorpha halys) releases a coriander‑like odor that is frequently likened to the scent of a bedbug. It is a winged true bug that emits this smell when disturbed.
Which winged insect smells like a bedbug? - in detail
The insect that produces an odor reminiscent of the scent emitted by bedbugs is the common stink bug (family Pentatomidae). Its defensive secretion contains aldehydes and acids that give a sweet‑musty, slightly coriander‑like smell, the same description used for the characteristic bedbug aroma.
Stink bugs are true bugs with four membranous wings; the forewings (hemelytra) are hardened at the base and flexible at the tips, allowing flight. They range in size from 5 mm to 20 mm, and most species display a shield‑shaped dorsal surface.
Key aspects of the odor:
- Chemical composition – primarily trans‑2‑hexenal, hexanal, and acetic acid; these compounds overlap with those identified in bedbug secretions.
- Function – deters predators and signals distress; the smell persists on surfaces for several minutes after the insect is disturbed.
- Perception – humans detect the scent at concentrations as low as 0.1 µg m⁻³, similar to the detection threshold for bedbug odor.
Ecological notes:
- Stink bugs feed on plant sap, occasionally on fruits, and some species are agricultural pests.
- The odor can be transferred to crops, causing consumer rejection despite the insects being harmless to humans.
- Seasonal activity peaks in late summer, matching the period when bedbug infestations often become noticeable.
Identification tips:
- Look for a pentagonal, shield‑shaped body with bright colors (green, brown, or yellow) and a distinct “V” on the dorsal surface.
- Observe the scent when the insect is handled or crushed; a rapid release of the characteristic smell confirms identification.
- Check for the presence of five scent glands on the underside of the thorax, the source of the defensive chemicals.
Understanding the similarity in odor helps differentiate between a true infestation of bedbugs and accidental contact with stink bugs, preventing unnecessary pest control measures.