Brown Marmorated Stink Bug (nymph stage)
Scientific Name: Halyomorpha halys
Order & Family: Order: Hemiptera, Family: Pentatomidae
Size: Nymphs start around 2mm; adults grow to approximately 17mm in length.
Natural Habitat
Agricultural land, gardens, and woodlands. They are known for entering human dwellings in autumn to seek shelter for winter.
Diet & Feeding
Polyphagous herbivore; they feed on various plants including fruits (like apples, peaches, and grapes), vegetables, and ornamental plants using piercing-sucking mouthparts.
Behavior Patterns
Nymphs undergo five instars before reaching adulthood; earlier instars (like the one pictured) are often found in clusters. They emit a pungent odor from scent glands when threatened or crushed.
Risks & Benefits
No health risk to humans as they do not bite or sting, but they are major agricultural pests and a nuisance indoors. They offer no significant ecosystem benefits in non-native regions.
Identified on: 1/13/2026