Bug Identifier
Bagworm Moth Larva (Casemaking stage)
Community identification

Bagworm Moth Larva (Casemaking stage)

Psychidae family (various species)

Order & Family
Lepidoptera, Psychidae
Size
1 cm to 15 cm depending on species and age
See this bug in the Encyclopedia

Natural Habitat

Found globally on various host plants, including coniferous and deciduous trees, as well as on walls or structures near vegetation.

Diet & Feeding

Larvae are herbivorous, feeding on the leaves and needles of host plants like cedars, junipers, and arborvitae.

Behavior Patterns

Larvae construct a protective silk case incorporating environmental debris (twigs, leaves, soil). They live inside this case, extending their heads to feed and dragging the case with them. Females often remain wingless and never leave the case, even to mate.

Risks & Benefits

They are considered a significant horticultural pest; heavy infestations can completely defoliate and kill host trees. They pose no direct physical risk to humans but can cause aesthetic and economic damage to landscapes.