Graves: New Bark Disease of White Pine 
85 
As far as can be ascertained, these inoculations were unsuc- 
cessful, for at the present date, i. e., after the lapse of nearly 
three years, in three cases the wounds have healed at their edges. 
Unfortunately, the fourth tree has been lost sight of, but it is of 
course possible that it was one of the dead trees which have 
recently been removed from the blank. Since the inoculations 
were made in the spring of the year, the season may have been 
unfavorable for the invasion of the fungus, for at this period of 
its most rapid growth the pine has naturally its greatest capacity 
for wound healing. 
At the present time, the blank caused by the disease in the 
above mentioned locality is more or less circular, and about 30 
feet in diameter. Thirty-one trees have died, and 7 more, here 
and there around the edge of the area, are dying, each one with 
the characteristic canker at its base (Plate 120, fig. 1). Of the 
dead trees, the youngest show eight years’ growth, proving that 
they died in 1910. The disease may therefore have been present 
at least two or three years before this. 
Recently, Professors Tourney and Hawley, of the Yale Forest 
School, have again directed the writer’s attention to the disease. 
Professor Tourney states that he has recently observed it near 
Conway Lake, Conway Center, New Hampshire. Here, among 
wild white pines, he saw several diseased patches, in one or two 
instances a rod or more in diameter. The trees were all the way 
from 1 to 10 feet in height, and showed the characteristic con- 
strictions at the base of the stem. Professor Hawley has also 
noticed the trouble in various plantations in Connecticut. Dr. 
W. E. Britton, of the Connecticut Agricultural Experiment Sta- 
tion, says that he has seen it, or something very similar, on a 
plantation near Middletown, Conn. We understand that the 
same disease has also been reported as occurring in the State of 
New York. 
Dr. G. P. Clinton, 1 in his report of Connecticut plant diseases 
for 1911-12, notes a trouble which is evidently the same. Speak- 
ing of it as a “ stem canker,” he states that some of the speci- 
mens have the aspect of being attacked by a parasitic fungus. He 
has found a Phoma fruiting on the dead area, and thinks that the 
trouble may be due to this. 
1 Clinton, G. P. Rept. Conn. Agr. Exp. Sta. 1912: 354. pi. 19a. 1913. 
