July 1 1924 
Inheritance in Kota-Hard Federation Grosses 
29 
Table XIX. —Segregation of 1722 F 2 plants of the Kota-Hard Federation cross, in 
comparison with parents, into 10 per cent infection classes for stem-rust infection, 
when grown at St. Paul, Minn., and Mandan, N. Dak., in 1922 
Source and rust infection classes (per cent) 
Number and percentage of plants on stem-rust infection 
F 2 hybrids 
Hard Federation 
Kota 
Number 
Percent¬ 
age 
Number 
Percent¬ 
age 
Number 
Percent¬ 
age 
ST. PAUL, MINN. 
o_ .. „___ _ _ . 
9 
1. 6 
36 
100.0 
15_ _ .. _ _ _ 
40 
7. 1 
25_ 
85 
15. 1 
35_ 
92 
16. 3 
45_ 
150 
26.6 
55___ 
43 
7. 6 
65_ 
96 
17. 0 
8 
25. 8 
75._ 
31 
5. 5 
13 
42. 0 
85__ 
16 
2.8 
6 
19.4 
95___ 
2 
.4 
4 
12.9 
Total_ 
564 
100.0 
31 
100.1 
36 
100.0 
MANDAN, N. DAK. 
5_ - 
7 
. 6 
31 
37 8 
15__ _ 
109 
9. 4 
46 
56 1 
25___ 
115 
9.9 
5 
6.1 
35_ 
173 
14.9 
4 
5. 9 
45_ 
274 
23. 7 
9 
13. 2 
55_ 
160 
13.8 
13 
19.1 
65___ __ - 
235 
20. 3 
25 
36.8 
75_ 
63 
5. 4 
12 
17, 6 
85__ 
20 
1.7 
5 
7.5 
95_ 
2 
.2 
Total- _ _ 
1,158 
99.9 
68 
100.1 
82 
100.0 
Table XX.-— Segregation of 6,052 F 2 plants of Kota-Hard Federation and reciprocal 
crosses into resistant and susceptible classes for stem-rust infection, when grown 
at St. Paul, Minn., and Mandan, N. Dak., in 1922 
Number and percentage of F 2 plants 
Source and cross 
Number 
of Ft 
families 
Susceptible 
Resistant 
Total 
number 
Devia¬ 
tion 
from 
Prob¬ 
able 
error 
Number j 
Per¬ 
centage 
1 Number 
Per¬ 
centage 
15:1 
ST. PAUL, MINN. 
j 
Kota X Hard Federation _ _ 
30 
864 j 
92.0 
75 
8.0 
939 
16 
5.00 
Hard Federation X Kota_ 
40 
963 | 
93.3 
69 
6.7 
1,032 
4 
5.24 
Total. _ 
70 
1,827 j 
92.7 
144 
7.3 
1,971 
21 
7.24 
MANDAN, N. DAK. 
1 i 
Kota X Hard Federation _ 
28 
1,946 I 
93.2 
143 
6.8 
2,089 
12 
7. 48 
Hard Federation X Kota _ 
38 
1,876 
94.2 
116 
5.8 
1,992 
9 
7.28 
Total. ... 
66 
3,822 
93.7 
259 
6.3 
4,081 
4 
10.46 
Grand total... 
75 
5,649 j 
93.3 
403 
6.7 
6,052 
25 
12,70 
The rust notes taken on individual 
F 2 plants shown in Table XIX were on 
the same plants labeled for date of 
heading and measured for height. 
These were of the Kota X Hard Federa¬ 
tion cross. Kota showed resistance, 
with an average of only 3.5 per cent 
infection at St. Paul and 12 per cent at 
Mandan. Hard Federation was sus¬ 
ceptible, with an average infection of 
