CHESTNUT BARK DISEASE. 369 



From the results of these observations, it seems to take at least 

 two, and more frequently three, four or more years, to entirely 

 kill the larger trees. 



The trees at Stamford were on the farm of Mr. F. V. Stevens, 

 and we are indebted to him and his son for aid in the experi- 

 ments there. The trees were first marked by the writer and 

 Mr. Filley in April, 1909. At that time many of them were 

 in bad condition, as they were in the region where the blight 

 first made its appearance in this state. All of the trees and 

 sprouts in a certain area were numbered, and their condition 

 as regards blight recorded. They varied in size from sprouts 

 2 to 8 inches in diameter to large trees two feet in diameter. 

 The following table shows their condition when first examined, 

 and after two growing seasons. They were not examined in 

 1911. In 1912, according to Mr. Stevens, Jr., all of the infected 

 trees were dead ; some of the sprouts, especially those developed 

 since the marking, however, were alive. In 1910 some of the 

 dead sprouts did not show any, and others but little signs of 

 the fungus, and their death may have been partly due to other 

 causes, as drought and winter injury, though all are included 

 in the following table. 



Sprouts, 2-8 in. diam. Trees, 10-24 ' n - diam. 



Apr. 1909. Nov. 1910. Apr. 1909. Nov. 1910. 



No. % No. % No. % No. # 



Free 26 25.7 7 6.9 7 29.2 o o 



Little diseased 28 27.7 10 9.9 8 33.3 i 4.2 



Moderately diseased ... 14 13.9 4 4.0 2 8.3 3 12.5 



Badly diseased 24 23.8 15 14.8 2 8.3 10 41.7 



Dead 9 8.9 65 64.4 5 20.8 10 41.7 



Totals 101 101 24 24 



The trees at Middlebury, all above six inches in diameter, 

 were in a grove belonging to the Whittemore estate. For 

 their experimental use the Station is indebted to the farm 

 superintendent, Mr. W. M. Shepardson. The trees were on a 

 hillside having a southern exposure, and had recently been 

 thinned, by taking out those most diseased. They no doubt 

 suffered from blight more severely because of winter and 

 drought injury, due in part to their exposure and the thinning. 

 The trees were first examined in February, 1910, and marked, 

 but not numbered, with a sign indicating their condition as to 



