218 W. 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. S. 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 repprted 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. 



