Forest Tent Caterpillar

Natural Habitat

Deciduous forests, woodlands, and urban areas across North America; often found on oaks, maples, and poplars.

Diet & Feeding

Herbivorous; larvae feed on the foliage of broadleaf trees and shrubs, occasionally causing significant defoliation during outbreaks.

Behavior Patterns

Unlike other tent caterpillars, they do not build silk tents; instead, they spin silken mats on branches where they congregate to rest or molt. They are known for cyclical population booms every 6 to 10 years.

Risks & Benefits

Risks: Can cause major defoliation, which stresses trees and may kill weakened ones. Benefits: Provide a significant food source for birds, rodents, and other insects; their droppings (frass) cycle nutrients back into the forest soil.

Identified on: 4/5/2026