Nov. 1, 1925 
Infection of Wheat Plants by Ophiobolus graminis 
833 
Table IV .—Effects of soil temperature on the infection of young Goldcoin wheat 
'plants with Ophiobolus graminis 
[These results are from experiments which were a part of the soil moisture experiments and comprise all 
of the data obtained in soil of medium water content] 
Experiment 2B 
• 
Experiment 3B h 
Experiment 4B 
C 
Summary d 
Average soil tem¬ 
perature, °C. 
Number of plants 
Leaf-blight rating 
Tiller-base infec¬ 
tion rating 
Root-infection 
rating 
Average soil tem¬ 
perature, ° C. 
Number of plants 
Leaf-blight rating 
Tiller-base infec¬ 
tion rating 
Is 
.2| 
A *" 
o 
o 
« 
Average soil tem¬ 
perature, ° C. 
Number of plants 
Leaf-blight rating 
| Tiller-base infec- 
! tion rating 
Root-infection 
rating 
Average soil tem¬ 
perature, ° C. 
Leaf-blight rating 
1 Tiller-base infec¬ 
tion rating 
Root-infection 
rating 
g 
32 
0.0 
1.0 
9.4 
8 
54 
0.0 
63.5 
64.7 
8 
49 
0.0 
33.3 
33.3 
8 
0.0 
32.6 
35.8 
12 
33 
1.5 
64.6 
44.7 
12 
54 
.0 
69.1 
70.0 
12 
49 
70.4 
94.5 
98.5 
12 
23.9 
76.0 
71.0 
16 
31 
11.2 
18.2 
10.7 
16 
51 
36.2 
97.4 
76.4 
16 
57 
72.8 
94.7 
99.5 
16 
40.0 
70.1 
62.2 
20 
27 
16.6 
3.7 
12.3 
20 
42 
30.9 
92.0 
79.0 
20 
51 
71.5 
94.8 
93.1 
20 
39.7 
63.5 
61.4 
24 
20 
.0 
.0 
.0 
24 
44 
28.4 
78.7 
70.0 
24 
49 
60.2 
93.1 
89.3 
24 
29.5 
57.3 
53.1 
28 
17 
.0 
1.9 
.0 
28 
47 
2.1 
26.2 
37.0 
28 
50 
.0 
64.0 
66.0 
28 
.7 
30.7 
34.3 
32 
5 
.0 
.0 
.0 
32 
.0 
.0 
.0 
• This experiment was carried on at the same time and in the same manner as experiment 2A, except 
that the soil moisture was held near 64.4 per cent. . A1 _ , „. 
b This experiment was carried on at the same time and m the same manner as experiment 3A, except 
that the soil moisture was held near 55 per cent. . ... . 
• This experiment was carried on at the same time and in the same manner as experiment 4A, except 
that the soil moisture was held near 56 per cent. ^ , „ 
d Average amount of infection at each soil temperature in experiments 2B, 3B, and 4B having soil mois¬ 
tures of 54.4, 55, and 56 per cent, respectively. 
Table V .—Effects of soil temperature on the infection of young Goldcoin wheat 
plants with Ophiobolus graminis 
[These results are from experiments which were a part of the soil moisture experiments and comprise all of 
the data obtained in soil of relatively high water content] 
Experiment 2C 
• 
Experiment 3C b 
Experiment 4C 1 
1 
5 
Summary d 
id 
ft 
f £ 
< 
Number of plants 
Leaf-blight rating 
Tiller-base infec¬ 
tion rating 
Root-infection 
rating 
Average soil tem¬ 
perature, ° C. 
Number of plants 
Leaf-blight rating 
Tiller-base infec¬ 
tion rating 
Root-infection 
rating 
Average soil tem¬ 
perature, ° C. 
Number of plants 
Leaf-blight rating 
Tiller-base infec¬ 
tion rating 
Root-i nfection 
rating 
Average soil tem¬ 
perature, ° O. 
J Leaf-blight rating 
Tiller-base infec¬ 
tion rating 
Root-infection 
rating 
8 
35 
0.0 
12.3 
66.6 
8 
45 
0.0 
33.3 
66.6 
8 
57 
0.0 
29.2 
33.3 
8 
0.0 
24.9 
55.5 
12 
26 
28.8 
62.8 
73.3 
12 
46 
15.2 
67.4 
75.2 
12 
48 
5311 
65.9 
88.3 
12 
32.3 
65.3 
78.9 
16 
28 
32.1 
77.3 
81.0 
16 
43 
79.0 
97.6 
98.3 
16 
60 
72.5 
85.0 
95.5 
16 
61.2 
86.6 
91.6 
20 
20 
42.5 
58.3 
79.0 
20 
56 
36.6 
93.4 
84.5 
20 
46 
66.3 
89.8 
88.3 
20 
48.4 
80.5 
83.7 
24 
16 
.0 
18.7 
43.7 
24 
37 
67.5 
94.5 
96.4 
24 
48 
76.0 
88.2 
96.8 
24 
47.8 
67.1 
78.9 
28 
19 
.0 
15.8 
20.3 
28 
32 
40.6 
87.5 
90.4 
28 
27 
7.4 
37.0 
37.6 
28 
16.0 
46.7 
49.4 
32 
5 
.0 
6.6 
20.0 
32 
32 
32 
.0 
6.6 
20.0 
• This experiment was carried on at the same time and in the same manner as experiment 2A, except that 
the soil moisture was held near 71.6 per cent. , 0 A * 
» This experiment was carried on at the same time and in the same manner as experiment 3A, except that 
the soil moisture was held ne^f 80 per cent. . ... ^ , .. f 
m This experiment was carried on at the same time and in the same manner as experiment 4A, except that 
th T"™fof h intec D tion“t Ka temperature in experiments 2C, sc. and 4C having soil mois- 
tures of 71.6, 80, and 80 per cent, respectively. 
