Vol. XXX, No. 4 
336 
Journal of Agricultural-Research 
Table IV.— Damping-off of coniferous stems caused by Corticium vagum 
i 
Number of i Number of seed- | Per cent of seedlings i 
lines tested j lings inoculated killed j 
Tested fungi 
On Pinus resinosa 
On Pinus banksiana 
On Picea engelmanni 
Pinus 
resinosa 
. 
Pinus 
resinosa 
Picea engelmanni 
Average 
Average of corrected per¬ 
centages 
Agar inoculum 
Rice inoculum | 
1 
Pinus banksiana 
Picea engelmanni 
Agar inoculum 
Rice inoculum 
Pinus banksiana 
Corticium vagum: 
All lines_ 
30 
23 
12 
680 
730 
250 
140 
36 
46 
45 
36 
41 
39 
Lines isolated from coniferous 
hosts_ 
23 
17 
10 
550 
580 
190 
130 
37 
44 
39 
36 
39 
37 
Lines isolated from other hosts. - 
’ 
6 
2 
130 
150 
60 
10 
30 
51 
63 
0 
38 
41 
Line No. 147_ 
1 
1 
1 
130 
160 
30 
30 
44 
58 
37 
77 
54 
61 
Reisolations of line No. 147_ 
4 
3 
2 
70 
70 
30 
20 
71 
50 
40 
5 
42 
35 
Line No. 213_ 
1 
1 
20 
20 
10 
70 
75 
100 
82 
85 
Reisolations of line No. 213_ 
2 
2 
i 
40 
40 
20 
16 
55 
68 
55 
60 
60 
62 
Line No. 230___ 
1 
\ 
20 
20 
10 
50 
100 
100 
83 
81 
Reisolations of line No. 230_ 
3 
3 
l 
60 
60 
30 
10 
40 
50 
33 
30 
39 
43 
Line No. 240.. 
1 
1 
i 
20 
20 
10 
10 
75 
100 
100 
90 
91 
93 
Rhizoctonia potomacensis a _ 
1 
1 
l 
20 
20 
10 
10 
5 
35 
30 
0 
18 
18 
Controls.... 
975 
1,225 
450 
300 
0.1 
2. 5 
0.7 
0.3 
1 — 
• Only aline of Corticium vagum, according to H. A. Edson, who furnished it. 
Table V.— Damping-off of coniferous stems caused by Fusarium spp. 
Number of 
lines tested 
Number of seedlings 
inoculated 
Per cent of seedlings killed 
Tested fungi 
On Pinus resinosa 
On Pinus bank¬ 
siana 
On Picea engel¬ 
manni 
Pinus 
resinosa 
Pinus banksiana 
Picea engelmanni 
Pinus 
resinosa 
Pinus banksiana 
Picea engelmanni 
Average 
Average of cor¬ 
rected percentages 
Agar in¬ 
oculum 
Rice inoc¬ 
ulum 
Agar in¬ 
oculum 
I 6 
\ § s 
! 
.2 s 
tf 
Fusarium sporotrichioides_ 
1 
1 
1 
20 
20 
10 
10 
25 
1 
jlOO 
1 
90 
80 
74 
83 
Fusarium discolor sulphureum. 
1 
20 
20 
50 
90 
70 
54 
Fusarium arthrosporioides_ 
1 
1 
20 
20 
i0 
15 
65 
! 40 
i . 
40 
52 
Fusarium trichothecioides 
1 
20 
20 
40 
35 
1 
38 
20 
Gibberella saubinetii.. 
2 
1 
1 
80 
90 
30 
30 
8 
1 56 
50 
27 
35 
27 
Fusarium hyperoxysporum. 
1 
1 
20 
20 
10 
0 
55 
50 
35 
32 
Fusarium sp. between roseum and 
discolor groups. _ 
1 
1 
1 
20 
20 
10 
10 
0 
j 55 
20 
40 
29 
28 
Fusarium monili forme species and 
section: 
[ 
All lines__ 
13 
11 
6 
380 
410 
130 
80 
5 
! 41 
28 
26 
25 
19 
Lines isolated from coniferous 
; 
hosts__- 
8 
7 
3 
280 
310 
90 
50 
7 
41 
34 
26 
27 
20 
Lines isolated from other hosts.. 
5 
4 
3 
100 
100 
40 
30 
0 
i 40 
18 
7 
16 
15 
Nectria ipomoeae _ _- 
1 
20 
20 
10 
40 
25 
18 
Fusarium martiella section. _.. 
1 
1 
20 
20 
10 
0 
5 
70 
25 
24 
Unidentified Fusarium spp 
2 
40 
40 
3 
40 
22 
18 
Fusarium solani group... . _ 
3 
1 
60 
60 
10 
0 
17 
50 
22 
19 
Fusarium orthoceras?_ . 
1 
20 
20 
10 
30 
20 
40 
Fusarium martii_ 
1 
1 
20 
20 
10 
:_ 
5 
I 15 
20 
13 
18 
Fusarium culmorum group_ 
3 
3 
.... 
60 
60 
30 
10 
3 
45 
0 
0 
12 
12 
Fusarium radicicol a... 
1 
20 
20 
10 
10 
10 
4 
Fusarium elegans group_ 
8 
2 
1 
150 
170 
20 
10 
1 
19 
15 
0 
9 
10 
Fusarium avenaceum_ 
1 
20 
20 
0 
15 
8 
12 
Fusarium coeruleum _ 
1 
20 
30 
| 
o 
13 
7 
2 
Fusarium acuminatum__ 
3 
1 
60 
60 
10 
2 
7 
10 
1 6 
4 
Fusarium vasinfectum... 
2 
1 
i 
40 
40 
10 
3 
13 
0 
5 
Fusarium discolor section_ 
3 
1 
40 
60 
10 
0 
5 
10 
1 5 
5 
Fusarium ventricosum__ __ 
1 
20 
20 
o 
0 
1 o 
o 
Fusarium oxysporum_ 
1 
20 
20 
10 
' 
0 
0 
0 
! o 
0 
Fusarium eumartii_ 
1 
20 
20 
- - 
0 
0 
0 
o 
Controls . ..... 
1 
975 
1,225 
450 
300 
0.1 
2. 5 
0. 7 
0. 3 
i 
i 
i 
i 
