274 
Journal of Agricultural Research 
Vol. XXXI, No. 3 
TIME REQUIRED FOR TREATMENTS 
The time required for each treatment was recorded. Table III 
gives the average figures obtained: 
Table III .—Time consumed in girdling experiments 
Western hemlock 
White fir 
Both species 
Kind of treatment 
Average 
d. b. h. <* 
Time 
per tree 
<1 man) 
Average 
d. b. h. 
Time 
per tree 
<1 man) 
Average 
d. b. h. 
Time 
per tree 
(1 man) 
Bark stripped off_ 
Inches 
18 
Minutes 
g 
Indies 
13 
Minutes 
7 
Inches 
15 
Minutes 
7 
Girdled with ax notch _ 
15 
7 
13 
4 
14 
5 
Stripped and girdled with notch. _.. 
14 
9 
12 
11 
13 
10 
Girdled with sawed notch—.. 
14 
11 
11 
11 
12 
11 
2 to 4 chopped notches 7 inches long filled 
with chemical_ 
12 
8 
13 
5 
12 
Q 
4 auger holes 3 inches deep filled with 
chemical____ 
14 
10 
13 
9 
13 
9 
Girdled with ax notch, 2 auger holes filled 
with chemical__ 
16 
10 
12 
8 
14 
9 
• Diameter at breast height. 
It is apparent from this record that the method of girdling with 
and ax notch was distinctly faster than any of the other methods, 
requiring an average of 5 minutes of one man ? s time to a tree com¬ 
pared to 7 minutes for the stripping method, 10 minutes for the 
combined stripping and notch methods, and 11 minutes for the 
sawed-notch method. 
CONCLUSIONS 
No definite conclusions can be drawn from this work as yet because 
of the small number of instances showing effects of these treatments, 
and also owing to the possibility of developing further and more 
satisfactory methods of eliminating undesirable hemlock and fir. 
It seems probable, however, that girdling with an ax notch is the 
most desirable method, both in respect to cost and effectiveness. 
Also it seems that girdling in the spring and early summer (April, 
May, and June) is more effective than girdling during the late 
summer or winter. 
So far, burning as a means of getting rid of these trees has not been 
thoroughly investigated, and it is planned to carry out further work 
along this line in order to determine just how far elimination can be 
accomplished when the slash from timber sales is burned. 
