BULLETIN 1058, U. S. DEPARTMENT OF AGRICULTURE. 
Table III. — Counts of sterility observed in oat panicles collected at random in a field of 
Wisconsin Pedigree 1 (Wisconsin Wonder), at Madison, Wis., July 21, 1920. 
[Th 
e extreme and 
average percentages of sterility are shown in 
boldface figure 
sj 
Normal and sterile spikelets counted. 
Bundle 1. 
Bundle 2. 
Bundle 3. 
Panicle. 
Total. 
Nor- 
mal. 
Sterile. 
Total. 
Nor- 
mal. 
Sterile. 
Total. 
Nor- 
mal. 
Sterile. 
Num- 
ber. 
Per 
cent. 
Num- 
ber. 
Per 
cent. 
Num- 
ber. 
Per 
cent. 
No. 1 
45 
53 
38 
44 
40 
40 
42 
41 
34 
38 
42 
60 
42 
45 
27 
42 
32 
39 
38 
37 
25 
32 
39 
48 
3 
8 
11 
2 
8 
1 
6 
15 
28 
4 
20 
2 
40 
50 
43 
32 
65 
37 
31 
38 
55 
41 
54 
54 
50 
34 
45 
38 
28 
41 
33 
29 
34 
41 
35 
37 
37 
• 35 
6 
5 
5 
4 
24 
4 
2 
4 
14 
6 
17 
17 
15 
15 
10 
11 
12 
37 
10 
6 
10 
25 
14 
31 
31 
30 
67 
51 
82 
61 
85 
52 
41 
58 
45 
fin 
15 
10 
24 
16 
25 
18 
26 
27 
10 
16' 
15 
33 
29 
24 
23 
23 
23 
15 
16 
19 
18 
11 
11 
14 
9 
12 
13 
16 
22 
No. 2 
19 
No. 3 
29 
No. 4 
27 
No. 5 
29 
No. 6.... 
72 *4 
25 
No. 7 
4 9 
4 
75 
93 
62 
62 
77 
73 
81 
69 
90 
76 
78 
65 
51 
78 
72 
45 
48 
43 
49 
47 
53 
72 
49 
66 
52 
46 
62 
40 
52 
45 
67 
53 
55 
50 
35 
59 
54 
34 
37 
29 
40 
35 
40 
56 
34 
No. 8 
29 
No. 9 
9 
6 
3 
12 
26 
15 
7 
20 
16 
No. 10 
25 
No. 11 
19 
No. 12 
45 
No. 13 
35 
No. 14 
34 
No. 15 
25 
No. 16 
30 
No. 17 
29 
No. 18 
23 
No. 19 
31 
No. 20 
24 
No. 21 
i 
25 
No. 22 
24 
No. 23 

1 
23 
No. 24 
33 
No. 25 1... 
18 
No. 26 
25 
No. 27 
24 
No. 28; 
25 
Average 
43 
37 
5 
13 
45 35 9 
18 
67 
48 
18 
26 
The panicles recorded in Table III were collected on July 21 with- 
out regard to sterility from an acre plat on the agricultural grounds 
of the University of Wisconsin. It was noticeable that every panicle 
showed some sterility, the amount varying from 1 spikelet per panicle 
in bundle 1 to 33 spikelets per panicle in bundle 3. This field from 
which the panicles were taken was practically free from halo blight. 
There were no lesions on the upper leaves, flag leaves, or panicles, 
and only an occasional lesion on a lower leaf could be found. In the 
case of this variety there seems to have been no connection what- 
ever between the halo blight and the sterility recorded above, yet 
in bundles 2 and 3 the average sterility was more than a third of the 
whole number of spikelets. 
In the 1920 experiments (Table IV), as in 1918, water and bac- 
terial suspensions sprayed into oat sheaths produced more sterility 
than occurred naturally. The average of 21 per cent of sterility on 
untreated plants is high, but this increased to 40 and 52 per cent 
when water was sprayed into the sheaths and to 44 and 63 per cent 
with bacterial suspensions. In this experiment the bacterial sus- 
