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What are the Yellow Bugs on My Milkweed Plants?

Yellow bugs on milkweed are typically aphids, specifically the Oleander Aphid (Aphis nerii), also known as the Yellow Milkweed Aphid. These aphids are small, bright yellow insects that tend to cluster on milkweed plants, especially on the undersides of leaves, stems, and buds.

Oleander Aphid (Aphis nerii) on Milkweed (Asclepias).

Here’s a brief overview of these aphids:

1. Appearance: The Oleander Aphid is bright yellow with black legs and antennae. They are pear-shaped and may appear in large clusters.

An Aphids gotta eat too. Most Milkweed can handle a moderate Aphid infestation.

2. Feeding: Aphids feed on plant sap, which they extract with their needle-like mouthparts. This feeding can weaken the milkweed and cause the leaves to curl or become distorted.

3. Reproduction: Aphids reproduce quickly, leading to rapid infestations. Most of the individuals you see are females that reproduce asexually, giving birth to live young without mating, called “parthenogenesis.”

4. Honeydew: As aphids feed, they excrete a sticky substance called honeydew. This substance can attract ants and lead to the growth of sooty mold, which can further damage the plant.

5. Natural Predators: Aphids have several natural enemies, including ladybugs, lacewings, and parasitic wasps. These beneficial insects can help control aphid populations.

Ladybugs are natural predators of Aphids.

6. Management: If you’re trying to conserve milkweed for monarch butterflies, consider using gentle methods to manage aphids. You can wash them off with a strong stream of water or introduce beneficial insects. Avoid using broad-spectrum insecticides, as they can harm beneficial insects and monarch caterpillars.

It’s worth noting that while aphids can be a nuisance, milkweed plants are usually resilient and can withstand a moderate aphid infestation. However, if the population becomes too dense, it may be worth taking action to protect the health of the plant and provide a suitable habitat for monarch caterpillars.

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