ENpDoTHIA CANKER OF CHESTNUT 601 
two below the surface of the soil. Experience has shown that the stumps 
of infected trees and portions of the green tops which are permitted to lie 
for several months on the ground, are almost certain to become infected 
if the bark is permitted to remain on them, even though no cankers exist 
on the stump at the time the tree is cut. Some of the largest spots of 
infection have devel- 
oped from unpeeled 
stumps. The spores 
germinate on the sappy 
surface of the stump 
and the mycelium 
grows downward 
through the cambium, 
and in the course of a 
year or two reaches 
the sprouts which come 
around the base of the 
stump. Little infection 
in the sprouts is found 
where the stumps have 
been carefully peeled. 
Furthermore, the 
sprouts have more 
vigor and are better 
rooted when they come 
from peeled stumps, 
since in this case they 
must start from be 
neath the soil and can 
so form their own 
roots.” (Figs. 98 to 
IOI.) 
Fic. 98.— Peeling the base of a diseased tree. Woodsmen 
Bs me the tesulis’ ef find this easier than peeling the stump after the tree ts 
thecutting-outmethod, cut 
the following is quoted 
from the same report (page 27): ‘‘ Sufficient time has not elapsed since 
the Commission began work to determine the efficiency of sanitation in 
checking the disease. . . . Forty-two tracts on which the original 
infection was cut out during the early part of 1912 were reinspected during 
November and December of this year (1912). The number of diseased 
trees in these spots prior to cutting ranged from a single tree to ninety-three, 
the total number of diseased trees on the forty-two spots being five hundred 
