I have been aware of the Milkweed Tussock Moth’s use of the milkweed as their host plant. I have washed away overwhelming numbers of bright yellow aphids. I have seen how dirty looking the milkweed plants get later in the fall. But I did not realize just how many other insects rely upon milkweed and why I’ve seen what I’ve seen. Common Milkweed Insects is a very interesting article!
Note: As Susan Mahr mentions in her article, monarch caterpillars typically prefer younger shoots of milkweed, so I often cut back some of my milkweed plants in late July/early August. This will cause the milkweed plants to resprout with new young leaves before the birth of the last generation of monarchs which will need to migrate to Mexico.