THE ROTS OF WESTERN WHITE PINE. 
9 
In order to get a first-hand impression of the characteristics of 
western white pine from the point of view of the logger, question- 
naires were sent to a large number of lumber and logging concerns 
operating in the Northwestern States. Out of the total answers re- 
ceived 18 were selected in which the replies to the questions were 
complete. Most of these answers were received from companies oper- 
ating in the States of Oregon, Washington, Idaho, and Montana. 
In respect to site, most of these answers state that the rot is 
greatest in trees occurring on flat, low, and poorly drained land, and 
that the best sites, where trees are freer from rot, are well-drained 
slopes or benches. Altitudes ranging from 1,500 to 7,500 feet are 
given as most favorable to healthy stands, and conversely the greatest 
proportion of rot is found in stands at altitudes below 1,500 feet. 
In Table I it is seen that the proportion of rot on the bottom sites 
(7.8 per cent) is somewhat greater than on the slope sites (6.1 per 
cent). Apparently, this difference is directly due to the site and 
corroborates what has already been said in reference to environment 
favorable to fungous development. The above comparison of rot 
percentages for the two types of site is made more exclusive when 
the figures for the percentage of infected trees for each type are 
considered. The difference, presumably, would have been still 
greater if the proportion of the trees on sites of the slope type in 
certain of the older age classes had not been so much greater than 
for sites of the bottom type. In Table II a comparison is made be- 
tween two sale areas in the same forest but separated by a consider- 
able distance. The trees occurring on the slope sites only were used, 
and these were restricted to the age class of 121 to 1 160 years. A 
glance at Table II will show that the trees from the Honeysuckle 
sale area averaged 132 years and those of the Silver Creek sale area 
142 years, a difference of 10 years. 
Table II. — Comparison of two sale areas of western white pine of the 121 to 
160 age class growing on slope sites, showing the relation of rots to site. 
[T. H.= trunk-rot, B. R.= butt-rot.] 
Average 
age 
(years). 
Total volume (cubic feet). 
Volume of rot 
(per cent). 
Number of trees (basis). 
Sale area. 
Stand. 
Rot. 
T.R. 
B.R. 
T.R. 
+ 
B.R. 
Total. 
Sound. 
Infected. 
T.R. 
B.R. 
T.R. 
+ 
B. R. 
T.R. 
+ 
B.R. 
Per- 
cent- 
age. 
Honeysuckle. 
Silver Creek. 
132 
142 
22,172 
18, 095 
323.5 
536.6 
96.1 
1.6 
419.5 
538.3 
1.45 
2.96 
0.43 
.01 
1.89 
2.97 
122 
106 
36 
24 
86 
82 
70.5 
77.3 
128265°— 19— Bull. 799- 
