8 
BULLETIN 799, U. S. DEPARTMENT OF AGRICTJLTUKE. 
pared, it is found that the bottom sites show a greater tendency to- 
ward favoring fungous development. The average percentage of 
infected trees for the bottom sites by this method is 52, and for the 
slope sites 47. On the bottom sites the rot percentage is 7.8, and on 
the slope sites 6.1. These figures indicate that although a slightly 
larger percentage of trees was infected (55.3) and although the trees 
were considerably older on an average on the slope sites, the bottom 
sites carry the larger rot percentage. Considering the various areas 
upon which data were taken as a unit, the total volume of rot was 
found to be 13,359 cubic feet and the total volume of the stand 
193,132 cubic feet. This gives a rot percentage of 6.9, or 7.0 figured 
on a basis of 1,282 sound and infected trees, ranging from the 10 
years' growth to the veterans of 450 and more years. 
Table I. — Relation of rots to age classes in icestern white pine on sites of the 
bottom and slope types. 
[Abbreviations: T. R.= trunk-rot: B. R.= butt-rot.] 
Age compu- 
tations (years). 
Average volume (cubic feet). 
Number of trees 
(basis). 
i 
i 
OS 
Rot per infected tree. 
Infected. 
Annual increase 
Age classes. 
o 
a 
© 
S 
o 
between age 
classes. 
© 
o 
© 
ti 
tf 
C3 
£2 
8 
i 
> 
< 
t> 
(-1 
© 
"3 
i— 1 
C3 
"3 
1 
B 
H 
+ 
pq 
+ 
1 
tf 
fr 
+ 
EH 
«3 
1 
Bottom sites: 
41 to 60 years 
a?, 

0.99 




;o 
37 




61to80vears 
73 
21 
.16 
30.7 
.8 

.8 
.04 

.04 
58 
4 

4| 6 
81 to 100 years 
88 
In 
.72 
82.7 
1.7 
1.2 
1.6 
.06 
.08 
.055 
73 
38 
5 
43 37 
101 to 120 years... 
113 
?,r> 
1.67 
150.9 
4.2 
2.4 
4.0 
.10 
.05 
.09 
40 
63 
8 
7164 
121 to 160 years... 
131 
18 
3. 12 196. 2 
9.5 
2.5 
9.2 
.29 
.007 
.29 
43 
83 
3 
86 67 
161 to 200 years... 
180 
49 
15.67 
203.0 
19.0 
281.3 
33.6 
.19 
5.7 
.50 
4 
68 
4 
72 94 
201+ years 
289 
109 
18.3 
450. 5 
83.6 
135.9 
85.0 
.59 

.47 
1 
37 
1 
38 97 
Total 
123 
7.8 
18.1 
61.6 
21.6 
256 
293 
21 
314 
= 
Slope sites: 
41 to 60 years 
48 


2.7 






50 




61 to 80 years 
65 
17 
.06 
4.6 
.03 
.14 
.055 
.0015 
.008 
.003 
56 
3 
1 
4 
7 
81 to 100 years 
91 
26 
.371 11.2 
.19 
.16 
.17 
.006 
.001 
.0045 
74 
11 
13 
24 
24 
101 to 120 years... 
110 
19 
.45 57.9 
.8 
.295 
.6 
.03 
.007 
.025 
59 
30 
11 
41 
41 
121 to 160 years... 
137 
27 
2. 34i 178. 9 
5.7 
6.0 
5.7 
.18 
.21 
.19 
61 
156 
18 
174 
74 
161 to 200 years... 
164 
27 
2.36 237.3 
7.3 
5.1 
6.7 
.06 
.04 
17 
61 
21 
82 
83 
2014- years 
343 
179 
14.67j485.2 
76.3 
56.0 
72.2 
.38 
.28 
.36 
1 
55 
14 
69 
98 
Total 
139 
6.1 
17.6 
12.9 
16.7 
318 
316 
78 
394 
55.3 
1 
SITE. 
The western white pine is found in situations which supply suffi- 
cient moisture and shade to fill the requirements of the tree. Mois- 
ture plays an important part in its establishment and development, 
and this is emphasized by the fact that the western white pine attains 
L its best growth in the regions where rainfall is plentiful. 
