36 Nebraska Agricultural Exp. Station, Research Bui. 12 
Table 9 — (Continued) — Comparison of rate of growth of 
mycelium from inoculations made at different 
seasons of the year 
Two-Year 
-Old Trees 
One-Inch Wood of 
DATE INOCULATED 
Mature Trees 
Above 
Below 
Above 
Below 
Inches 
Inches 
Inches 
Inches 
±.0 
1.0 
Q n 
1.5 
2.5 
9.0 
6.5 
8.0 
12.0 
14.0 
30.0 
2.0 
3.0 
5.5 
13.0 
4.5 
6.0 
16.0 
24.0 
July 15-20 
2.0 
4.0 
14.0 
25.0 
4.0 
8.0 
5.5 
6.0 
1.0 
3.5 
14.0 
16.0 
6.5 
8.0 
11.0 
6.5 
2.0 
6.5 
4.0 
7.5 
1.0 
2.5 
24,5 
31.0 
18.0 
22.0 
Average 
3.09 
5.23 
12.04 
16.79 
9.0 
4.5 
7.0 
7.5 
8.0 
9.0 
3.0 
11.0 
1.5 
2.5 
3.5 
6.0 
3.0 
4.5 
14.0 
19.5 
6.0 
4.5 
12.5 
15.0 
Aug. 2 3-2 8 \ 
7.0 
8.0 
12.0 
18.0 
2.5 
6.0 
12.0 
14.0 
4.0 
6.0 
6.0 
18.0 
3.5 
5.5 
5.0 
10.0 
4.0 
7.0 
4.5 
12.0 
1.5 
2.0 
12.0 
30.0 
1.0 
1.5 
14.0 
12.0 
Average 
4.25 
5.08 
8.79 
14.42 
lations made in June. The average growth of June inocula- 
tions in branches of mature trees was no greater than that of 
July inoculations. The July inoculations in young trees aver- 
aged less growth than the August inoculations. Ben Davis 
trees of equal size and vigor were used in both series. The 
writer is unable to explain the much more rapid growth from 
inoculations made in late summer. It could not have been be- 
cause the spores were more virile late in the summer since half 
of the inoculations in each case were made with pure culture. 
Hence the trees must have been more susceptible at that time. 
However, if this is true, it does not explain why the late inocu- 
lations made such a phenomenal growth compared to the infec- 
tions which had the whole season in which to grow. 
