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Butterfly Farming Gardening Horticulture Milkweeds (Asclepias) Monarch (Danaus plexippus)

What are the Orange and Black Bugs on My Milkweed?

Orange and black bugs on your Milkweed are likely to be the Milkweed Bug (Oncopeltus fasciatus). These friendly bugs are associated with Milkweed Plants and are often found feeding on the seeds, stems, and leaves.

Milkweed Bug (Oncopeltus fasciatus) on a Milkweed Seed pod.

Here’s a bit more about them:

Appearance

Milkweed Bugs are easily recognizable by their striking orange or red coloration with black markings. They have a conspicuous black band across their wings and black antennae.

Diet

They primarily feed on Milkweed, utilizing their specialized mouthparts to pierce the plant and consume its sap. They have a particular interest in the seeds, as they contain high amounts of nutrients.

Role in the Ecosystem

Milkweed Bugs play a role in controlling milkweed plant populations by feeding on the seeds, which can limit the spread of the plants. Their bright coloration is also a warning to predators that they might not taste good, a trait they acquire from the toxic compounds found in milkweed.

Impact on Monarch Butterflies

Since both Monarch caterpillars and Milkweed Bugs rely on milkweed, they share the same habitat. However, Milkweed Bugs generally don’t harm Monarch butterflies or their larvae, as they have different feeding habits.

Conclusion

Milkweed Bugs are an interesting and common sight on milkweed plants. Their vibrant colors and specialized diet make them unique insects that contribute to the ecological balance within their habitat. If you are cultivating milkweed to support Monarch butterflies, the presence of Milkweed Bugs is normal and should not be a cause for concern.

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