370 CONNECTICUT EXPERIMENT STATION REPORT, IQI2. 



the disease at that time. They were examined again and 

 re-marked at the end of that season, and examinations were 

 made again at the end of the seasons in 1911 and 1912. In 

 these later examinations data were not taken from all of the 

 marked trees, but the condition of each tree examined was 

 compared with its condition in the fall of 1910. The badly 

 diseased and dead trees increased from 5.7 per cent, in the spring 

 to 35 per cent, in the fall of 1910, to 58 per cent, in 1911, and 

 to 69 per cent, in 1912. Th^ following table shows the conditions 

 at the different times of examination : 



No. 



Not diseased 67 



Little diseased 67 



Medium diseased.. 14 



Badly diseased.... 9 



Dead o 



Totals 157 



DISTRIBUTION AND HOSTS. 



In the United States. The blight, first noticed in the late 

 summer of 1904 at Bronx Park, New York, was said by Merkel 

 to have spread by the end of 1905 so that 98 per cent, of the 

 trees in this borough were infected. Murrill (45), in June, 

 1906, reported the disease from New York, New Jersey, Mary- 

 land and Virginia, and in September also from the District of 

 Columbia. In February, 1908, he (48) gave Connecticut and 

 Massachusetts as additional states. Metcalf and Collins (36) 

 showed the distribution by August, 1909, to include Rhode 

 Island, Pennsylvania and Delaware. Except in the vicinity of 

 New York City, including adjacent parts of New York, Con- 

 necticut, Long Island and New Jersey, the points of infection 

 at this time, so far as known, were scattered rather than 

 general. In May, 1910, Metcalf and Collins (37) included 

 West Virginia among the infected states. The past year the 

 disease has been reported also from New Hampshire and 

 Vermont. 



At the present time the most damage caused by this disease 

 in Massachusetts and Connecticut has been along and west of 

 the Connecticut river. In New York it is conspicuous along 

 the Hudson River up to Albany, and in western Long Island. 



