Common Bagworm

Natural Habitat

Found on various host plants including conifers (juniper, arborvitae, cedar) and deciduous trees (maple, oak) across North America.

Diet & Feeding

The larvae are generalist feeders that consume the foliage, needles, and sometimes the bark of their host trees and shrubs.

Behavior Patterns

Larvae construct silk cases camouflaged with bits of twigs and leaves from the host plant. They carry these cases while feeding. Females are flightless and spend their entire lives inside the case, while males emerge as clear-winged moths to mate.

Risks & Benefits

They are considered a significant horticultural pest as heavy infestations can lead to complete defoliation and death of the host tree. They provide no significant benefits to human environments, though they are a food source for some birds and parasitic wasps.

Identified on: 3/19/2026