American Dagger Moth Caterpillar

Commonly found in deciduous forests, woodlands, suburban gardens, parks, and any areas with their host trees.

The caterpillars are polyphagous, feeding on the leaves of a wide variety of deciduous trees and shrubs, including maple, oak, elm, willow, birch, ash, and fruit trees.

These caterpillars are solitary feeders and are found from late spring to early fall, depending on the region. As they prepare to pupate, they spin a cocoon often incorporating their urticating hairs. The adult moths are nocturnal and are attracted to light.

Potential risks include skin irritation (dermatitis) upon contact with their urticating hairs, which can cause itching, rash, and in some cases, allergic reactions. They are generally not considered pests unless their populations are exceptionally high. Benefits include serving as a food source for birds and other insectivores, and as pollinators in their adult moth stage.