Tussock Moth Caterpillar (likely Orgyia species)

Natural Habitat

Found in various habitats where their host plants grow, including forests, woodlands, gardens, and urban green spaces. They are often found on deciduous trees and shrubs.

Diet & Feeding

Herbivorous. These caterpillars feed on the leaves of a wide variety of deciduous trees and shrubs, including oak, willow, birch, rose, and fruit trees. They can consume significant amounts of foliage.

Behavior Patterns

Tussock moth caterpillars are known for their distinctive tufts of hair and can be quite active feeders. They go through several instars (growth stages) before pupating. The adult moths are often sexually dimorphic, with females sometimes being wingless or having reduced wings. They are known for their striking appearance and can sometimes be found in large numbers during outbreaks.

Risks & Benefits

Potential risks include skin irritation or allergic reactions in sensitive individuals upon contact with their barbed hairs, especially from species like the White-marked Tussock Moth (Orgyia leucostigma), which can cause a rash (urticaria). Large populations can cause significant defoliation of host plants, leading to weakened or stressed trees, especially in urban or ornamental settings. Benefits include being part of the food chain, serving as a food source for birds and other predators. They also play a role in nutrient cycling within their ecosystems.

Identified on: 9/8/2025