The fungus Entomophaga maimaiga was introduced to North America to control the gypsy moth Lymantria dispar. The fungus also infects O. leucostigma (Hajek et al., 2004) and could possibly have an impact in years when E. maimaiga is abundant.
Orgyia leucostigma sablensis is a subspecies of Orgyia leucostigma found only on Sable Island in Nova Scotia, Canada.