218 WwW. V. AGR. EXPERIMENT STATION [Bulletin 137 
vania, Deleware, Maryland, Virginia, West Virginia, and the 
District of Columbia. 
A glance at the map, figure 10, will show how general has 
been the spread from New York City as a center. In consid- 
ering this map one should remember that a diseased tree is 
practically doomed to die. There are numerous diseased 
areas, especially in Pennsylvania, which have been found 
since this map was plotted. 
Fig. 9.—A view showing complete destruction on young chestnut stand in 
forest area. 
E. R. Hodson, of the U. 5. Forest Service, writing of this 
disease in 1908, says, “In Pennsylvania it is no where abun- 
dant yet, although it exists at Easton, South Bethlehem, and 
Morrisville, and is reported as far north as Pocono Mountains, 
and as far south now as Philadelphia.” In recent correspon- 
dence with the Pennsylvania Commission for the investiga- 
tion and control of this disease, they have sent us a map show- 
ing that the area of general infection now includes nearly 
one-half of the state. A similar rapid spread has been record- 
ed in other states and a great united effort should be made to 
prevent its further progress. 
