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 
1g11. 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 faleus 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 in. diam. 
Apr. 1909. Nov. rgro. Apr. 1909. Nov. 1910. 
No. % No. % No. % No, % 
Bree: oswihwielh cae eee 260 25,7 7 6.9 7 20.2 0 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 3 125 
Badly diseased ......... 24 238 «115 148. 2 83  I0 417 
Dead cies aay ok wees 9 89 65 64.4 5 208 10 41.7 
Totals iscews6 sa sties 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 
