The larvae are most damaging to fabrics of animal hair origin, but also may infest spices or grain-basedfoods, tobacco, feathers, dead insects, and fungus accumulations. A related species may often be found feeding on the mycelial growth of fungus on damp wood. The larvae create a silken case which they must stay within, dragging it with them as they move about, and enlarging it as they grow. The adults do not feed, and both adults and larvae avoid light, although the larvae may wander over walls and floors in a darkened room.
Seeking the source of the infestation is crucial, as killing only adult moths does not affect the developing larvae. The larval habitat will be in a hidden area, usually in materials that have remained undisturbed for some period of time, and alternative foods such as insect nests or fungus growth need to be considered.