PEACH DISEASES 277 
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LeaFr-CuRL 
Caused by Ezoascus deformans (Berk.) Fekl. 
It is evident that this disease has long been associated with 
the peach, this fruit-tree being a natural host for the causal 
organism. Furthermore the disease is distinctly one affecting 
the peach and its derivatives, such as the nectarine and peach- 
almond. It has rarely been found on other fruits. This 
trouble, known as peach leaf-curl, curl, curly-leaf and leaf- 
blister, affects both orchard trees and nursery stock, certain 
varieties showing more resistance than others. The Elberta 
and Carman are the most susceptible in New York State, while, 
in the nursery at least, the Richards is resistant. Seedling 
peaches show marked susceptibility, which fact indicates that 
the disease may have originated with the wild peach in central 
China. 
The disease has long been known in England, where it was 
described as early as 1821 by an English gardener as blister. 
It has become widely distributed throughout the world wherever 
peaches are grown, being most serious near the seacoast or in 
the region of large interior lakes. In the United States and 
Canada itis very common and destructive in the peach-grow- 
ing sections about the Great Lakes. Likewise in the Pacific 
