BULLETIN 1163, U. S. DEPARTMENT OF AGRICULTURE. 
Table 4. — Infection court of conic -rot in Douglas fir. 
Infections. 
Number, 
basis. 
Percentage of total. 
Average 
volume. 
Infection court. 
Number. 
Volume. 
Board 
feet. 
Cubic 
feet. 
Board 
feet. 
Cubic 
feet. 
Knots 
98 
10 
3 
4 
1 
2 
83.0 
8.5 
2.5 
3.4 
.9 
1.7 
99.62 
.04 

.34 


99.48 
.03 
.05 
.43 


796 
3 

68 


77.0 
2 
Falling-tree wounds 
1.4 
Lightning scars 
8.2 
Dead tops 


Table 5.— Infection court of trunk-rot in Douglas fir. 
Infections. 
Number, 
basis. 
Percentage of total. 
Average 
volume. 
Infection court. 
Number. 
Volume. 
Board 
feet. 
Cubic 
feet. 
Board 
feet. 
Cubic 
feet. 
Knots 
Tire scars 
Tailing-tree scars 
1 
46.7 
13.3 
26.7 
13.3 
44.6 

30.0 
25.4 
46.1 

26.9 
26.9 
353 

415 
705 
28.4 

29.0 
58.0 
Table 6 brings out the relation between fire and red-brown butt-rot. 
The major portion of the infections entered through fire scars, and 
the resulting volume of decay was proportionately much higher. This 
butt-rot also attacks the roots and can probably be spread by the con- 
tact of a diseased root with a sound one. About 11 per cent of the 
volume of rot is apparently traceable to this method of infection. 
Besides these two the other infection courts are of no importance. 
Table 6.— Infection court of butt-rot in Douglas fir. 
Infections. 
Number, 
basis. 
Percentage of total. 
Average 
volume. 
Infection court. 
Volume. 
Board 
feet. 
Jubic 
feet. 
Board 
feet. 
Cubic 
feet. 
1 
41 
I 
4 
16 
4 
1.4 
58.6 
5.7 
5.7 
22.9 
5.7 
1.1 
78.2 
3. 7 
2.5 
10.8 
0. 5 
79.1 
5 
1.8 
11.5 
2.1 
60 
83 
40 
28 
29 
38 
2.0 
8.0 
5.2 
1.8 
3.C 
2.2 
