744 
Journal of Agricultural Research voi. xxiv, No. 9 
permanent winto snow came, different treatments were applied to five 
of the beds, while the sixth was left untreated as a control. The object 
of these special treatments was mainly to afford mechanical protection 
from the disease. The treatmmt which gave much the best results 
consisted of a framework of 2 by 6 inch planks loosely placed with a 
spacing of i to 2 inches upon logs or squared timbers lying lengthwise 
along the sides of the beds. This type of protective covering, which was 
used on Bed 14, is shown in Plate 2, B. Two-inch lumber was used, 
mainly because it was available. It is possible that one-inch lumber 
could be used, if it were adequately supported to hold the heavy mass of 
snow above the tops of the seedlings. As soon as the snow had melted 
sufficiently in the spring to permit, the framework was removed. It was 
placed on the bed each autumn before the advent of the heavy winter 
snowfall. 
Table III .^—Survival of Douglas fir seedlings in beds receiving different treatments as 
indicated; sowing spring of xgi8. 
Survival. 
Bed 
Na 
Date of count. 
Total 
germina- 
In per cent 
Special treatment. 
tion. 
Total. 
ol total 
germina¬ 
tion. 
Per square 
Per square 
fo^. 
Per cent. 
fOct. 
9,1918 
103 
81.8 
Sept 
29,1919 
81 
64. 2 
13 
July 
1,1920 
> 126 
. 45 
35*7 
►None; control. 
Oct. 
6,1920 
42 
33-3 
May 
22,1921 
14 
II. I 
fOct. 
9,1918 
131 
80.3 
Sept 
29,1919 
24 
14.7 
Mulched with timothy hay 
13 
<Jufy 
1,1920 
y 163 
0 
0 
► winters of 1918-19 and 1919-20, 
Oct. 
6,1920 
0 
0 
1920-21. 
IMay 
32 ,1921 
0 
0 
Oct. 
9,1918 
98 
76.6 
Framework of 2 by 6's, 2 inches 
Sept 
. Jl3y 
29,1919 
95 
74.2 
apart supported by timbers 
14 
1,1920 
> 128 . 
84 
60. 0 
► several inches above tops of 
Oct. 
6,1920 
84 
60. 0 
trees. Winters 1918-19, 1919- 
May 
22,1921 
r 84 
60. 0 
20, 1920-21. 
Oct. 
9,1918 
58 
84. 0 
Sept 
July 
29,1919 
24 
34.8 
Mulched with aspen leaves. 
15 
1,1920 
► 69 < 
13 
18.8 
► Winters 1918-19, 1919-20, 
Oct. 
6,1920 
13 
18.8 
1920-21. 
May 
22,1921 
13 
18.8 . 
Oct. 
9,1918 
58 
73 * 4 
Sept 
29,1919 
28 
35-4 
Covered with canvas throughout 
16 
July 
1,1920 
> 79 < 
3 
3-8 
► the winters of 1918-19,1919-20, 
Oct. 
6,1920 
3 
3-8 
1920-21. 
May 
22,1921 
I 
^•3 ; 
Oct. 
9,1918 
96 
71. 6 
Sept 
July 
29,1919 
78 
58. 2 
Mulched with sterilized sand. 
17 
1,1920 
^ 134 ^ 
8 
6. 0 
^ Winters of 1918-19, 1919-26, 
Oct. 
6,1920 
8 
6. 0 
1920-21. 
May 
22,1921 
5 
3-7 - 
Oct. 
6,1920 
165 ^ 
® no 
66.6 
Framework, 2 by 6's. 
7 
May 
22,1921 
a 100 
60. 6 
Same as bed No. 14. 
9 
’Oct. 
May 
6,1920 
22,1921 
142 ^ 
“93 
0 23 
65.4 ' 
16. 2 
^None; control. 
• Sowing spring of s9ao* 
