928 
Journal of Agricultural Research voi. xxvii. No. 12 
Table II .—Percentage of infected seedlings and infected heads and percentage of galls , 
fek by number, volume, and weight, in the threshed grain of different varieties of winter 
^ wheat, winter rye, winter emmer, and winter spelt grown in inoculated soil at tne Arling¬ 
ton Experiment Farm, Rosslyn, Va., during the crop year 1919-20 
Percentage of infection based on— 
Variety. 
C. I. No. 
Percentage of* 
infected— 
Percentage of galls by— 
Seedlings. 
Heads. 
Number. 
Volume. 
Weight. 
Winter wheat: 
“Arkansas Red Wonder’'. 
67 
74 
51 
33 
23 
Bearded Purple Straw. 
1911 
73 
88 
83 
69 
59 
Bearded Winter Fife. 
1942 
66 
80 
52 
31 
22 
Brown Fife. 
1933 
68 
63 
43 
28 
14 
China. 
180 
62 
80 
61 
42 
3 i 
Currell. 
3326 
72 
80 
63 
48 
30 
Dietz Eongberry. 
1981 
52 
64 
40 
26 
16 
Genesee Giant. 
1744 
66 
85 
61 
4 i 
29 
Illini Chief. 
5406 
62 
66 
47 
29 
18 
Kanred . 
5146 
4832 
3 1 15-2 
1912-15 
5147 
1973 
2 
T. 
Eeap. 
50 
95 
54 
35 
24 
Mediterranean. 
57 
87 
65 
46 
33 
Do.;. 
68 
93 
73 
46 
41 
Nebraska No. 28. 
37 
44 
52 
25 
ir 
New Amber Eongberry. 
63 
93 
68 
51 
36 
Poole. 
3489 
1733 
1915 
3413 
6163 
2980 
65 
77 
50 
3 i 
20 
Potomac.. 
7 i 
65 
51 
3 i 
20 
Purplestraw. 
65 
9 i 
70 
52 
40 
Red Fultz. 
45 
7 i 
58 
36 
24 
Shepherd. 
52 
93 
72 
56 
42 
Stoner. 
73 
88 
73 
55 
42 
> 
Average. 
59 
75 
57 
39 
27 
Rye: 
Abruzzes. 
4 ° 
26 
96 
40 
12 
5 
Rosen. 
195 
174 
208 
35 
94 
53 
19 
10 
Von Riimker No. 2. 
31 
98 
55 
21 
11 
Winter. 
56 
65 
56 
22 
ir 
Average. 
37 
88 
5 i 
19 
9 
Emmer: 
Black Winter.. 
2337 
3628 
25 
71 
25 
White Winter.. 
27 
Average. 
48 
| 26 
Spelt: 
Alstroum. . . 
1773 
T *72 A 
28 
40 
! 6 
Bearded Winter... 
Red Winter. 
1 * 7^2 
35 
Average. 
34 
.. 
From a comparison of these methods, as shown in Table II and graphi¬ 
cally in Figure 1, it seems that the percentage of infection based on head 
counts invariably is the highest, while that based on the relative weight 
of galls and kernels is the lowest. However, in the case of winter wheat, 
none of these methods takes into consideration the reduction in stand 
following the use of nematode-infested seed. 
During the crop season 1921-22, the following experiment was con¬ 
ducted at Madison, Wis., to determine if reduction in stand followed the 
use of nematode-infested seed: Turkey wheat was sown in four plats 
of equal size. The first plat was sown with uninfested seed. The seed 
sown in the second plat was mixed with 5 per cent of its weight in galls. 
In the third plat the seed was mixed with 15 per cent and in the fourth 
