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ble for its spread to distant points, to British Columbia, 

 California, Nebraska, etc. In most of these new, distant 

 foci, the disease has since been eradicated. In Brooklyn 

 16,695 trees were killed on 350 acres, and the loss in and 

 about New York City in 1908 was placed at from $5,000,000 

 to $10,000,000. The total damage prior to the year 1911 is 

 conservatively placed at $25,000,000, and may now aggregate 



Fig. 205. — Distribution of chestnut blight in 1918. Courtesy of the 

 Office of Forest Pathology. 



twice that amount, but this is insignificant compared with 

 the loss that will ensue in the chestnut forests of the Appala- 

 chians. It has already caused more damage to forest trees in 

 America than any other fungus. The same disease has been 

 found in China, and it is reasonably certain that it was intro- 

 duced into the United States from the Orient some time prior 

 to 1904. This pest is vigorously parasitic on members of the 

 genus Castanea alone, and among the species of this genus the 

 Japanese and Chinese varieties are highly resistant. The 

 attack occurs upon the l)ark through wounds, but twigs and 

 leaves are not directly affected. From the point of attack 



