2 BULLETIN 395, TJ. S. DEPARTMENT OF AGRICTJLTUEE. 
losses in practically all of the important peach-producing districts in 
this area. 
The disease was first reported from Klostemeuberg, Austria, by 
Von Thumen (1877)/ who observed its occurrence upon the fruit of 
the peach and briefly described the associated fungus as Cladosporium 
carpopJiilum sp. nov. The same author (1879, p. 13-15) emended 
his original description of the fungus and published notes concerning 
the occurrence, description, and economic importance of the malady. 
The disease received little further attention until its occurrence in 
America was reported by Arthur (1889, p. 5-8), who noted its 
prevalence in Indiana and described the fruit lesions and the asso- 
ciated fungus, citing the work of Von Thumen. Peach scab, how- 
ever, was not unknown to American mycologists prior to this time, 
since the herbarium of the New York Botanical Garden and the 
Pathological Collections 2 of the Bureau of Plant Industry contain 
specimens collected by F. S. Earle, Cobden, 111., 1881 3 (on fruit) and 
1887 3 ' 4 (on leaves), and by A. B. Langlois, Mississippi, 1886 3 ' 4 (on 
fruit). Pammel (1892, p. 100) reported that Galloway, in unpub- 
lished notes, had recorded the occurrence of the " peach fungus" 
(Cladosporium carpopJiilum) on peach leaves. Halsted (1895, p. 
329-330) described what he considered to be scab injury upon peach 
leaves. A study of his description and illustrations, however, makes 
it appear conclusive that he failed to differentiate true scab injury 
from other foliage troubles. Taft (1894, p. 57) reported the scab 
fungus as attacking fruits, leaves, and tender shoots of the peach. 
He gave no details, however, concerning the injury on twigs and leaves. 
Sturgis (1897) noted a fungus, which he reported as conforming 
morphologically to the description of C. carpophilum, associated with 
twig injuries of the peach, almond, and apricot. He concluded that 
the fungus was C. carpopJiilum and that it was the causal agent of 
the trouble. He reported, however, no cultural studies or infection 
experiments. Clinton (1904, p. 340-341) briefly described scab 
injuries on peach fruit, twigs, and leaves. 
Selby (1898 and 1904), beginning in 1895, conducted an extensive 
series of peach-spraying experiments, from which he concluded that 
scab may be controlled by the use of Bordeaux mixture. A large 
number of similar tests have been made with Bordeaux mixture of 
various formulas and methods of preparation, but the toxicity of this 
fungicide to the foliage has prevented its coming into general use in 
the United States as a summer spray for peaches. Scott (1907 and 
i Bibliographic notations in parentheses refer to '^Literature cited," pp. 64-66. 
2 The writer wishes to express his indebtedness to the curators of these herbaria for their kindness in 
making these records available and in sending him material which enabled him to verify the identification 
of each of these collections. 
3 In the herbarium of the New York Botanical Garden, New York. 
4 In the Pathological Collections of the Bureau of Plant Industry, United States Department of 
Agriculture. 
