Unusual Rusty Tussock Caterpillar (Orgyia antiqua)

Observation by Anna R John:

This is the first time I've seen this kind of caterpillar in this area. Saw that in other parts of Alaska this caterpillar was shared at LEO Network.

Comments from LEO Editors:

This is the third observation about an unusual tussock moth caterpillar sighting. Jessie Moan, from the University of Alaska Fairbanks Cooperative Extension, consulted on the other observation about caterpillars, saying:

The caterpillars are tussock moth caterpillars. They are known to feed on a variety of trees and shrubs and can defoliate large areas when populations are high. Populations can vary from year to year depending on the weather.

These caterpillars feed on a variety of foliage including willow and berry bushes. During an infestation, these caterpillars can quickly defoliate plants, as seen in the photos attached to the two previous posts.

James Mason published an article in the Nome Nugget (see attached articles) where he described possible skin irritations that can occur if people touch the caterpillars. Under the microscope, the hairs look like small harpoons that can cause skin and eye irritations.

In a previous observation of these caterpillars, Rachael Lee, the Environmental Health Director for the Norton Sound Health Corporation, asked observers:

Are people developing skin rashes after handling these critters? If so, any general advice for home self-care to minimize the symptoms? Thanks!