Rusty Tussock Moths, (Orgyia antiqua), are native to Europe but now live throughout North America, Europe, and parts of Africa and Asia. The Rusty Tussock Moth also known as the Vapourer Moth, feeds on willow, apple, hawthorn, cedar, Douglas-fir, and a wide variety of other trees and shrubs. On coniferous trees the caterpillars feed on new growth, including not only the needles but also the tender bark on twigs.
Like many other Tussock Moths, Orgyia antiqua overwinters in the egg stage. A single generation lives each year, with the larvae emerging from eggs in spring. Caterpillars may be observed throughout the summer months. Male adults fly during the daytime in the summer, but females cannot fly and lay their eggs in a batch over the cocoon from which they emerged.