DAMPING-OFF IN FOREST NURSERIES. 
21 
Table II. — Relative susceptibility to damping-off of different conifer 
species — Continued. 
Reports of relative susceptibility. 
Host species. 
Not 
sus- 
cep- 
tible. 
Least 
sus- 
cep- 
tible. 
Less 
than 
average. 
Inter- 
medi- 
ate. 
More sus- 
ceptible 
than the 
average. 
Most 
suscep- 
tible. 
Pinacese (Abietoidese)— Continued. 
Nb.... 
N 
T 
T(2) 
T 
P 
T... 
T 
T... . 
Nb.... 
N, T(3).. 
Bp, N,T.. 
Pinus nigra poiretiana (Corsican pine) .... 
Bp... 
H 
B 
Nb.... 
Pinus ponderosa (type not specified) 
Pinus ponderosa (Eastern Rocky Moun- 
T(3).. 
P 
Bp, N (4), 
T(6). 
H (4) 
Nb.... 
T(4) 
B 
B 
N (3) 
Bp, H,T.. 
N. 
B, H. 
P 
P 
B, H, N.. 
T(2) 
N 
H, P.. 
C,N,T... 
Bp,T(3).. 
N. 
B 
Nb 
N (3) T (3) 
II 
N, T(5)... 
B 
Nb.... 
Pseudotsuga taxifolia (Northwestern 
B 
Nb.... 
Nb, P. 
Bu 
9 
6 
17 
10 
51 
31 
23 
14 
48 
29 
15 
9 
Sciadopitoideae: 
Nb. 
Cupressacese (Cupressoidese): 
Nb.... 
Nb 
T 
Bu 
Nb 
Nb 
N -..;'. 
Nb.... 
P... . 
N 
T... 
H, P.. 
T 
Nb.... 
Nb.... 
Nb.... 
T 
P 
P... . 
Nb.... 
Nb.. 
Nb.... 
9 
39 
7 
30 
2 
9 
4 
17 
1 
4 


Sequoideae: 
B 
T 
Taxacese: 
P 
The fact most evident in Table II is the extreme variation between 
reports, not only on closely related species but even on the same 
species. While it is, of course, possible that the obvious lack of a 
definite basis and method of comparison in most of the reports is 
responsible for most of this variation, it seems to the writer more 
probable that different species do actually vary in their relative sus- 
ceptibility to damping-off in different localities. Tn the first place, 
