Large Milkweed Bug. This large milkweed bug is a hemimetabolous insect meaning it grows in stages called instars and goes through incomplete metamorphosis exhibiting small changes throughout development such as coloration changes development of wings and genitalia. The small milkweed bugs lygaeus kalmii are between 1 8 1 2 11 12 mm long.
Oncopeltus oncopeltus fasciatus the large milkweed bug feeds on milkweed plants preferentially the flower buds and seed pods which are rich in nutrients. Buzzle has an article that explains the bug s life cycle. Immature milkweed bugs typically are found in clusters so their presence will catch your eye.
This helps to control the milkweed plant which can be invasive but is also an important food source and breeding location for monarch butterflies.
The large milkweed bug is 1 2 3 4 13 18mm long. Oncopeltus fasciatus dallas 1852 size. As a true bug milkweed bugs undergo incomplete metamorphosis. At each stage the bug is covered by an inflexible exoskeleton that constrains its growth.