Psoroptic mange has apparently been eradicated from domestic sheep in North America, but it is still a persistent problem for some wildlife populations. In the San Andres Mountains of New Mexico, a severe scabies epizootic reduced the mountain sheep population from .250 animals to a single individual during 18 yr (Sandavol 1980, Hoban 1990; D. Holderman, U.S. Army, White Sands Missile Range, NM, personal communication). Similarly, during the 1970s, psoroptic mites killed'80% of the white-tailed deer populations in Georgia (Stromberg et al. 1986).