What Is the Silkmoth?
Silkmoths (family Saturniidae) are large, beautiful moths found in North Carolina’s forests and residential areas. Species include the luna moth, cecropia moth, polyphemus moth, and promethea moth. Adults have large, broad wings spanning 3–6 inches with striking patterns and colors ranging from green to brown to reddish.
Habitat & Behavior
Adult silkmoths do not feed—they lack functional mouthparts. Their sole purpose as adults is to mate and lay eggs during their brief 1–2 week lifespan. They are nocturnal and are strongly attracted to outdoor lighting, which is how they most commonly come to homeowners’ attention.
Silkmoth caterpillars are large and feed on the leaves of various hardwood trees including oak, maple, birch, cherry, and walnut. While they can defoliate individual branches, they rarely cause significant damage to healthy, mature trees and are an important part of the natural food web.
Prevention & Control
Silkmoths are not pests and should not be treated with pesticides. They are beneficial insects that serve as food for birds and bats and are pollinators in some ecosystems. Their populations have declined due to habitat loss, light pollution, and pesticide use. If large moths appear around your porch lights, simply enjoy the encounter—they are harmless and temporary visitors.