Sept. 15, 1923 
Corticium vagum on the Pea and Bean 
439 
2 inches deep in each can. Uninoculated soil previously used to check 
cress and radish experiments was similarly mixed and used for growing 
control bean plants. 
Plantings were made on April 30 and the temperatures immediately 
adjusted. Seventeen days after the planting, on May 16, photographs 
were taken of the control plants and of one series of plants grown in the 
inoculated soil (PI. 2, A and B). The data taken at this same date on ? 
plants grown in inoculated soil are shown graphically in figure 4 and in 
Table VI. 
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Fig. 4. —Effect of soil temperature on the pathogenic action Of Corticium vagum on the bean. No plant 
survived at temperatures below 21 0 C. (see PI. 2). The growth curves show the effects of soil tempera¬ 
tures upon host development, judged both from dry weight and height of plants. 
Table VI. —Effects of soil temperature upon the pathogenic action of Corticium vagum 
on the bean and also upon the development of the bean plant (Experiment 1) 
Num¬ 
Plants grown in inoculated soil. 
Tempera¬ 
ture at depth 
of 1 inch. 
Num¬ 
ber 
of 
seeds 
plant¬ 
ed. 
ber of 
seeds 
grown 
in 
unin¬ 
ocu¬ 
lated. 
soil. 
Total 
num¬ 
ber. 
Num¬ 
ber 
very 
slightly 
injured. 
Number 
slightly 
injured. 
. < 
Num¬ 
ber : 
severe¬ 
ly in¬ 
jured. 
Num¬ 
ber 
cut 
off. 
Num¬ 
ber 
unin¬ 
jured. 
Per¬ 
cent¬ 
age 
unin¬ 
jured. 
Inten¬ 
sity of 
injury. 
Aver¬ 
age 
height 
of 
plant. 
Aver¬ 
aged ry 
weight 
of 
healthy 
plants 
16 days 
old; 
°C. 
AC 
14 
2C 
Plum¬ 
Destroyed. 
roo. 0 
300.0 
Cm. 
12.19 
Gm . 
0.073 
..... 
16.0 
At 
15' 
-J 
3I 
ule. 
100.0 
300/0 
17. 78 
. 087^ 
tR e 
AC 
I3 
29 
3 & 
38 
• « 
•• 
too. 0 
300.0 
18. 79 
.xi8 
at.c 
45 
45 
45 
45 
13 
13 
4 
5 
27 
100.0 
263. 7 
22.8 
. 150 
33,5. 
1 
13 
4 
18 
2 
94 - 7 
188.3 
24.1 
,i86 ; 
26. c... 
15 
15 
4 * 
43 
33 
30 
5 
3 
1 
10 
76. 2 
6oc8 
27.0 
• 235- 
2Q % 
3 
11 
74-4 
40. 0 
32.0 
•313 
