SPRING WHEAT ON THE NORTHERN GREAT PLAINS. 
39 
rust resistant, but early-maturing varieties have ripened before the 
rust has developed extensively and are sometimes rust escaping. 
In general, the early-maturing varieties of common wheat show a 
lower percentage of rust infection than late-maturing varieties. A 
few varieties of common wheat which show a small percentage of 
rust infection have been grown only at stations where the rust 
epidemics have been less severe. 
Table XVII. — Average stem-rust infection of 30 varieties of spring wheat grown at seven 
experiment stations in the northern half of the Great Plains area during three or more 
years in which rust occurred in the 7-year period from 1913 to 1919, inclusive, 
compared with the Marquis variety for the same station years. 
6 
co 
>> 
| 
~C3 
CO 
Stem-rust infection 
(per cent). 
Class, group, 
and variety. 
6 
6 
CO 
PI 
ta 
Stem-rust infection 
(per cent). 
Class, group, 
and variety. 
© 
a 
03 
Pi 
CD 
03 
> 
CD 
a . 
03 co 
CO S-i 
a 
u © 
£>> 
co o 
r 
Difference 
from Mar- 
quis. 
© 
a 
03 
Pi 
>> 
© 
03 
> 
© 
ic« 
W C3 
o£ 
el 
0*03 
1" 
Differ- 
ence from 
Marquis. 
© 
CO 

CO 
OP 
® 
1 
CO 
CO 
© 
COMMON. 
DURUM. 
Fife: 
Marquis 
G h i r k a 
Spring 
Glyndon 
3641 
1517 
2873 
3697 
3022 
2874 
4141 
2397 
4324 
3081 
4935 
6255 
2492 
4377 
4323 
2398 
20 
15 
13 
17 
8 
19 
7 
7 
13 
20 
7 
3 
5 
4 
14 
7 
17.7 
23.9 
21.4 
26.9 
30.9 
31.6 
13.1 
8.3 
17.4 
23.8 
25.7 
13. 
10.4 
14. 
12.4 
7.7 
Kubanka: 
Acme 
Algeria 
Arnautka 
Do .. 
5284 
3310 
1493 
4064 
1520 
5295 
1440 
1516 
4063 
1593 
3320 
4163 
3322 
1584 
6227 
8 
4 
9 
19 
3 
3 
16 
6 
12 
5 
8 
4 
6 
5 
3 
2.1 
6.7 
7.9 
12.2 
3.7 
20 
7.1 
6.7 
11.1 
9.6 
4 
22.5 
2.5 
6.2 
7.0 
19.4 
25 
13.6 
17.5 
5 
25 
17.9 
17.8 
20.9 
12.6 
22.9 
25 
21.3 
12.8 
24.7 
17 3 
17.1 
16.3 
19.9 
20.2 
18.4 
10.7 
13.1 
20.8 
17.7 
22.1 
19.3 
17 
17 
19.6 
18.4 
6.8 
5.1 
7 
10.7 
13.2 
2.4 
"6.T 
3.6 
"*4*8* 
3.4 
"6.Y 
6.6 
3.0 
7.2 
10.7 
18.3 
5.7 
•> 3 
Power 
Beloturka — 
Buford 
Kubanka 
Do 
1 3 
Rysting 
Bluestem: 
Haynes 
5 
10.8 
11 1 
Preston: 
Converse 
Erivan 
Pioneer 
Preston 
Ladoga: 
Huron 
Kubanka 
N0.8 
Marouani 
Monad 
Pierson 
Red Durum: 
D-5 
9.8 
3.0 
18.9 
2.5 
18 8 
Laramie 
Manchuria 
Peliss: 
Peliss 
6 fi 
Miscellaneous: 
Golden Ball.. 
Miscellaneous: 
Prelude 
Galgalos 
17.7 
Most varieties of durum wheat are more or less rust resistant, as 
compared with common wheats. All varieties shown in Table 
XVII are more resistant than Marquis. Three varieties, Acme, 
Monad, and D-5, are known to be especially rust resistant. During 
years of heavy rust infection these varieties have produced the 
highest yields. When grown Tinder comparable conditions in these 
and other experiments, the D-5 variety shows the greatest resistance 
of all varieties to stem rust. Table XVII shows the Acme to have 
the lowest infection of stem rust, 2.1 per cent, which is 17.3 per cent 
less than Marquis during the same station years. The Monad shows 
an average stem-rust infection of 4 per cent, which is 18.9 per cent 
less than Marquis in the same station years, while the D-5 variety 
shows an infection of only 2.5 per cent, with a difference from 
