In the central Atlantic states there occurs a peculiar disease of peach-leaves. It is more common from Maryland southward, being found in North Carolina, Virginia, West Virginia and Arkansas. It also occurs, but rarely, in the state of Ohio. The disease is not usually serious, although it prevails to a very noticeable extent in damp, shaded localities on trees bearing dense foliage. It was unusually prevalent on the Delaware and Chesapeake peninsula in the fall of 1891. Pale, yellowish or olivaceous spots with definite margins are produced by the fungus Cercosporella Persicce on the upper surface of the leaves; on the lower surface, opposite the yellowish spots, will be found a delicate frost-like growth of the fungus - the conid - iophores. Little is known of the causal fungus and its control.
Thaxter, R. Miscellaneous notes. Cercosporella Persicce Sacc.
Connecticut Agr. Exp. Sta. Rept. 1889: 173. 1890. Smith, E. F. Field notes, 1891. Frosty mildew. Journ. Myc. 7:91 - 92. 1892.