Brown Marmorated Stink Bug (nymph)
Scientific Name: Halyomorpha halys
Order & Family: Hemiptera, Pentatomidae
Size: Nymphs vary in size as they grow through instars, typically from 2 mm (first instar) up to 12 mm (fifth instar) before molting into adults. Adults are typically 12-17 mm in length.
Natural Habitat
Agricultural fields, orchards, gardens, wooded areas, and frequently invades homes and other structures seasonally.
Diet & Feeding
Polyphagous; feeds on a wide range of host plants, including agricultural crops (fruits like apples, peaches, berries; vegetables like corn, beans, tomatoes) and ornamental plants.
Behavior Patterns
Nymphs and adults feed on plant sap. Brown marmorated stink bugs often aggregate on the sunny sides of buildings in the fall, seeking overwintering sites. When disturbed, they emit a noxious odor.
Risks & Benefits
Potential Risks: Significant agricultural pest causing damage to numerous crops. Can be a nuisance pest when they aggregate in homes. Potential Benefits: No significant benefits known; considered a pest.
Identified on: 8/28/2025