Bagworm Moth Larva (or Casebearer)
Scientific Name: Thyridopteryx ephemeraeformis (Family Psychidae)
Order & Family: Order: Lepidoptera, Family: Psychidae
Size: Larval cases typically range from 0.25 to 2 inches (6mm to 50mm) in length, depending on the specific species and maturity.
Natural Habitat
Found worldwide, attaching themselves to rocks, trees, fences, and the sides of buildings. They construct protective cases from silk and environmental debris (twigs, soil, sand).
Diet & Feeding
The larvae feed on the leaves or needles of trees and shrubs. Some species also feed on lichens or small insects.
Behavior Patterns
Notable for carrying a protective 'mobile home' (case) made of silk and debris wherever they go. The larva eventually pupates inside this case. Females of many bagworm species never leave the case, even as adults.
Risks & Benefits
Generally harmless to humans (they do not bite or sting). However, they are considered pests in agriculture and gardening because heavily infested trees can be stripped of foliage, potentially killing the plant.
Identified on: 2/18/2026