Polyphemus Moth Cocoon: Identification and Life Cycle

That "Nest" on Your Crape Myrtle Is a Giant Silkworm Moth Cocoon

The urn-shaped structure attached to a crape myrtle branch is the cocoon of a Polyphemus moth (Antheraea polyphemus), a member of the giant silkworm moth family (Saturniidae). UGA entomologist Lisa Ames notes that Polyphemus moths often attach their cocoons to branches in the open, while the related Luna moth typically spins its cocoon in leaf litter. The opening at the top indicates the adult moth has already emerged.

About the Polyphemus Moth

• Caterpillars feed on a wide variety of woody trees and shrubs but rarely cause significant damage.
• Adult moths are large and striking, with prominent eyespots on their hindwings that resemble peacock feathers.
• No control needed—these are beneficial, native insects.

Enjoy the sight; it's a sign of a healthy ecosystem.

Polyphemus moth cocoon on crape myrtle

Cocoon detail showing emergence hole