Bug Identifier
Bagworm Moth Larva
Community identification

Bagworm Moth Larva

Thyridopteryx ephemeraeformis

Order & Family
Lepidoptera: Psychidae
Size
1/4 inch to 2 inches (6 mm to 50 mm) in length.
See this bug in the Encyclopedia

Natural Habitat

Found on various host plants including conifers (juniper, arborvitae, cedar, pine) and deciduous trees (maple, oak, sycamore).

Diet & Feeding

Larvae are generalist feeders that consume the foliage, needles, and sometimes the bark of their host tree.

Behavior Patterns

Larvae construct a protective silk case covered with bits of leaves and twigs from their host plant. They carry this 'bag' while feeding and eventually pupate inside it. Adult females are wingless and never leave the bag.

Risks & Benefits

Significant pests in landscaping and forests; heavy infestations can completely defoliate and kill trees. They provide a food source for birds and certain parasitic wasps.