Bug Identifier
Large Milkweed Bug
Community identification

Large Milkweed Bug

Oncopeltus fasciatus

Order & Family
Order Hemiptera, Family Lygaeidae
Size
10 to 18 mm in length
See this bug in the Encyclopedia

Natural Habitat

Found primarily on milkweed plants in fields, meadows, and gardens across North America

Diet & Feeding

Seed-eaters that specialize on milkweed pods; they use piercing-sucking mouthparts to inject enzymes and drink the dissolved nutrients

Behavior Patterns

They are gregarious, often found in clusters on seed pods; they are also known for their long-distance migrations and warning coloration to signal toxicity

Risks & Benefits

Generally harmless to humans and non-toxic to the plants themselves; they help control the spread of milkweed but compete with monarch butterflies for resources