938 
Journal of Agricultural Research 
Vol. XXVII, No. 12. 
the different organs, and four, five, or even more gall-producing florets 
may develop within a spikelet. In 25 diseased heads of wheatthere 
were found 2 spikelets with only 1 developed floret each, 85 spikelets 
with 2 florets, 120 with 3, 87 with 4, 30 with 5, and 4 with 6. In 
these same spikelets, 33 contained only 1 gall each, 108 contained 2 
galls each, 98 contained 3 galls, 70 contained 4 galls, 28 contained 5 
galls, 6 contained 6 galls, 2 contained 7 galls, and 1 contained 9 galls. 
Some of these data are presented in Table XI. 
Table XI .—Number of florets per spikelet and the contents of the florets in each spikelet 
in nematode-infected wheat heads from plants grown at the Arlington Experiment 
Farm, Va., in IQ20 
Spikelet No. 
Florets. 
Galls. 
Kernels. 
Spikelet No. 
Florets. 
Galls. 
Kernels. 
2 
3 
0 
37 . 
3 
2 
X 
4 
4 
1 
38. 
3 
2 
r 
4 
3 
2 
39 . 
4 
3 
X 
3 .. . • • * 
A 
5 
2 
3 
40. 
3 
3 
r 
3 
3 
1 
41 . 
3 
2 
1 
f, 
5 
4 
1 
42 . 
4 
3 
1 
* 
3 
4 
0 
43 . 
4 
5 
1 
ft 
6 
6 
1 
44 . 
3 
2 
X 
n 
4 
5 
0 
45 . 
3 
2 
r 
IO 
5 
6 
0 
46 . 
2 
0 
2- 
4 
3 
1 
47 . 
4 
3 
1 
r9 . 
4 
5 
0 
48 . 
3 
2 
1 
. 
4 
5 
0 
49 . 
4 
4 
0 
I 3 . 
TA 
2 
3 
0 
50. 
1 
z 
0 
*4 . 
T C 
3 
1 
2 
51.. 
5 
4 
X 
A 5 -..... 
3 
2 
1 
52. 
2 
1 
X 
T *7 
4 
3 
1 
53. 
3 
2 
I' 
x 7 . * ... 
tK 
3 
2 
1 
54 . 
2 
0 
2 
TO 
4 
2 
2 
55 . 
4 
3 
I 
. 
20 
3 
2 
1 
56. 
3 
2 
X 
OT 
3 
2 
i 
57 . 
4 
3 
I 
OO 
5 
5 
0 
58. 
3 
2 
r 
6 
9 
0 
59 . 
3 
X 
2 
. 
f>A 
4 
5 
0 
60. 
3 
2 
1 
. 
0 c 
4 
5 
0 
61... 
3 
2 
X 
. 
*> 6 \ 
5 
6 
0 
62. 
0 
X 
6 
7 
0 
63... 
2 
2 
a 
oft 
r 
7 
0 
64 . 
2 
X 
1 
j 
A 
3 
1 
65. 
3 
2 
r 
••• .. 
*r 
C 
4 
1 
66. 
3 
2 
1 
.. 
2 T 
O 
c 
4 
1 
67. 
4 
3 
1 
. 
0 
A 
4 
1 
68. 
4 
3 
1 
0* .. 
A 
3 
1 
69. 
3 
4 
a 
a .....>. 
*T 
A 
5 
0 
70 . 
' 4 
4 
0 
34 . 
*T 
A 
4 
0 
71 . 
5 
5 
0 
35 .. • • 
36 . 
*T 
4 
3 
1 
72. 
4 
6 
0 
Average. 
3-6 
3 2 
0. & 
DESCRIPTION OF gates 
In the earlier stages of their formation the young galls can be dis- 
tinguished from the naturally forming kernels by their greener color, 
their glistening smoothness, and the absence of the feathery pistil. As 
the heads approach maturity the galls are readily distinguished from the 
kernels by their shape, greener color, and the manner in which they cause 
the glumes to spread, due to their greater diameter. 
The mature galls in winter wheat, emmer, and spelt are alike m size 
and appearance, but considerable difference was observed .in the shape 
and color of the galls in some spring wheats, especially Prelude. 
The galls in wheat are from 3.5 to 4.5 mm. in length and from 2 to 3 
mm. in width. Variations from these dimensions are frequent, some 
galls being larger than wheat kernels and others very much smaller. 
