American Dagger Moth Caterpillar

Found in deciduous forests, woodlands, suburban areas, and gardens where their host trees are present. They are widespread across North America.

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

As caterpillars, they feed on various host plants. When mature, they pupate and later emerge as moths. The caterpillars are known to be solitary feeders. They are not typically aggressive but their hairs can cause irritation upon contact, which serves as a defense mechanism.

Potential risks include skin irritation (dermatitis) due to contact with their urticating hairs, which can cause itching, redness, and a rash in sensitive individuals. They are not typically considered a significant pest to healthy trees. As moths, they can be pollinators and are part of the food chain for birds and other animals, contributing to ecosystem biodiversity.