Bug Identifier
Milkweed bug (likely large milkweed bug)
Community identification

Milkweed bug (likely large milkweed bug)

Oncopeltus fasciatus

Order & Family
Hemiptera; family Lygaeidae
Size
Adults are about 10–13 mm (0.4–0.5 in) long.
See this bug in the Encyclopedia

Natural Habitat

Open, warm habitats containing milkweed, including meadows, roadsides, gardens, and disturbed areas. This image appears to show adults on a milkweed plant.

Diet & Feeding

Nymphs and adults pierce milkweed seeds, pods, and stems to drink plant sap. They may also consume nectar or fluids from damaged insects.

Behavior Patterns

Often aggregate in groups on milkweed and pass through five nymphal stages before adulthood. Adults can overwinter in sheltered places and are conspicuously orange-and-black, warning predators of toxins sequestered from milkweed.

Risks & Benefits

They do not bite people, transmit disease, or usually cause serious plant damage. Their feeding can reduce milkweed seed production, while their presence contributes to food webs and may help regulate milkweed growth.