FOREST DISEASE SURVEYS. 15 
found in a certain age class, a certain site (slope and bottom) for a 
given tree species for 
a given kind of rot, 
and would be com- 
piled from intensive 
field studies made 
upon felled trees. It 
would properly be 
termed a “table of 
rot percentages ” and 
would be used by 
the estimator of each » 
unit crew to deter- 
mine the rot percent- 
ages for each type of 
forest encountered. 
Further deductions 
for other defects 
could then be esti- 
mated and the total i a 
cull percentage se- Fie. 16. Tine nical rot of the root Fomes in ed fir. Note 
cured by the addition the black dots in the white areas. 
of the rot percent- 
age. In conjunction 
therewith, another 
table giving (1) the 
class of defect. (2) 
common name of the 
defect, (3) the fun- 
gus causing it. (4) 
the various tree spe- 
cies affected. (5) the 
general external and 
internal characteris- 
tics of the defects, 
and (6) the average 
extent of the rots 
and the general form 
of the rot within the 
tree would be of 
ereat service to the 
estimator. Such a Fic. 17.—Pholiota adiposa, the scaly Pholiota. (After 
Freeman.) 
Sor Corin SAW ay lla 
fy | jan ni 
system 2 3! 4\ 5 
table prepared from ; 
field data secured during the past three seasons is here submitted. 
(Table I; figs. 2 to 23.) 
