MAP SHOWING DISTRIBUTION OF* THE CHESTNUT-BARK DISEASE {DlClpevthe 



parasitica Murr.) in December, 1910 



It was probably imported with chestnut trees from Japan. First observed in the parks 

 of New York City in 1904, it has since rapidly spread, and now covers much of adjacent 

 territory in lower New York, Connecticut, Long Island, New Jersey, and Pennsylvania, 

 with widely scattered points of infestation. It is estimated that the loss in and about the 

 city of New York is now between 5 and 10 million dollars, and the loss throughout the 

 areas now infested is fully 100 million dollars. There is a prospective loss in Pennsylvania 

 of fully 50 million dollars, and the entire chestnut timber of America seems to be doomed. 

 All this might have been saved with proper quarantine laws. 



EXPLANATION OF SYMBOLS 



Black area. Complete infection; trees mostly dead. Spotted area. General infection. 

 Black dots. Infection reported by specimens or observed prior to 1909. Black crosses. In- 

 fection reported by specimens or observed in 1909. Black triangles. Infection reported on 

 reliable authority in 1909. Circles. Infection reported by specimens or observed in 1910. 

 Hollow triangles. Infection reported on reliable authority in 1910. (345) 



