DAMPING-OFF IN FOREST NURSERIES. 
43 
Table III. — Inoculation experiments with Pythium clebaryanum in pots of steri- 
lized soil — Continued. 
Pyth 
ium strain. 
Num- 
ber 
of 
pots. 
Inoculation 
method. 
Results. 
Series, experiment number, 
and host. 
No. 
Initialstrain 
from which it 
Emerged 
(per 5-pot 
Damp- 
ing-off 
after 
germi- 
Sur- 
vival 
(per 5- 
was reisolated. 
unit). 
nation 
pot 
(per 
unit). 
cent). 
Series B .— Reisolated strains — 
Continued. 
338 
No. 295 (in P. 
ponderosa, 
expt. 58). 
5 
(a) 
9 
67 
3 
345 
No. 218 (in P. 
banksiana, 
expt. 58). 
5 
(a) 
15 
33 
10 
414 
No. 258 (in P. 
banksiana. 
5 
(a) 
36 
25 
27 
No. 66, Pinus banksiana. . 
expt. 62, 2d 
unit). 
415 
do 
5 
(a) 
59 
10 
54 
• 
419 
No. 348 (in P. 
banksiana, 
expt. 62). 
5 
(a) 
25 
100 

450 
No. 347 (in P. 
banksiana, 
expt. 62). 
5 
(a) 
41 
72 
11 
Controls. 
338 
25 
5 
75 
7 
14 
57 
64 
No. 295 (in P. 
(a) 
3 
ponderosa, 
expt. 58). 
345 
No. 218 (in P. 
banksiana, 
expt. 58). 
No. 258 (in P. 
5 
(a) 
24 
37 
15 
414 
5 
(a) 
57 
24 
44 
banksiana, 
expt. 62, 2d 
unit). 
No. 67, Pinus banksiana. . 
415 
No. 258 (in P. 
banksiana, 
expt. 62, 1st 
unit). 
5 
(a) 
30 
37 
19 
419 
No. 348 (in P. 
banksiana, 
expt. 62). 
5 
(a) 
62 
65 
22 
450 
No. 347 (in P. 
banksiana, 
exDt. 62). 
5 
« 
53 
27 
39 
.Controls 
338 
23 
5 
87 
85 
5 
26 
83 
No. 295 (in P. 
(a) 
63 
ponderosa, 
expt. 58). 
345 
No. 218 (in P. 
banksiana, 
expt. 58). 
5 
w 
76 
24 
58 
414 
No. 258 (in P. 
banksiana, 
expt. 62, 2d 
unit). 
5 
(a) 
98 
14 
84 
No. 68, Pinus resinosa 
415 
No. 258 (in P. 
banksiana, 
expt. 62, 1st 
unit). 
5 
(a) 
92 
11 
82 
419 
No. 348 (in P. 
banksiana, 
5 
(a) 
95 
45 
52 
* 
expt. 62). 
v. • 
450 
No. 347 (in P. 
banksiana, 
expt. 62). 
5 
(a) 
84 
40 
51 
Controls 
18 
104 

104 
o All inoculations with fragments of agar cultures scattered broadcast at one side of the pot, including 
about one-fourth of its area. Nothing was added to the controls in experiment 62, but sterile agar was 
added to the controls in experiments 66, 67, and 68. 
As has been stated, securing positive results did not always mean 
that the control pots remain uninfected. Even with the most care- 
ful treatment and the use of boiled water throughout the experiment 
