Jan. 12,1924 
Soybean Mosaic 
93 
Table II .—Seed transmission by different varieties, 1921 
Variety. 
Number 
of plants. 
Number 
of seeds. 
Number 
of seed¬ 
lings. 
Per cent 
germina¬ 
tion. 
Number 
of mosaic. 
Per cent 
mosaic. 
Midwest. 
IO 
676 
535 
79 
121 
2 3 
Haberlandt. 
i 8 
435 
350 
80 
2 3 
7 
Black Eyebrow. 
I 
3 1 
2 3 
74 
8 
35 
Arlington.j 
I 
46 
i 7 
37 
1 
6 
Feldun.! 
I 
15 1 
122 
88 
4 
3 
Lexington.* 
1 
62 
58 
93 
0 
0 
Dunfield.! 
I 
45 
i 7 
38 
0 
0 
Manchu. 1 
1 
1 
1 
64 
27 
42 
0 
0 
Table III .—Seed transmission by different varieties, 1922-23 
Tested. 
In winter in greenhouse. 
In summer of 1923 in 
field. 
Variety. 
Number of 
plants. 
Number of 
seedlings. 
Number of 
mosaic. 
Per cent 
mosaic. 
Midwest . 
19 
114 
11 
IO 
Haberlandt. 
8 
97 
7 
7 
< A. K. 
3 
! 
17 
2 
12 
Feldun. 
1 
2 ! 
21 
0 
0 
Lexington . 
3 1 
2 3 
0 
0 
''Midwest . 
17 ! 
54 
5 
9 
Haberlandt . 
6 ! 
88 
3 
3 
< A. K.! 
2 I 
iS 
0 
0 
Lexington . : 
2 1 
20 
0 
0 
Manchu. 
! 
2 ! 
18 
0 
0 
The results shown in Tables II and III indicate that varieties differ 
somewhat in their ability to transmit mosaic. The Midwest, Haberlandt, 
Black Eyebrow, A. K., and Arlington varieties apparently transmit the 
disease more readily than Feldun, Manchu, Lexington and Dunfield. 
Individual plants of the same variety also differ greatly in the extent 
to which the disease is transmitted to their progeny. In the progenies 
of six single selections (Midwest) planted in the field in 1921, the per¬ 
centage of mosaic varied from o to 33 per cent. 
In the progenies of the ten single plant selections from mosaic Mid¬ 
west plants in Table II, the percentage of mosaic seedlings varied from 
6 to 38 per cent, and among the eight Haberlandt progenies the per¬ 
centage of mosaic varied from o to 16. In the progenies of the 19 Mid¬ 
west plants recorded in Table III, mosaic was absent in eight and varied 
from 7 to 50 per cent in the others. Four of the eight Haberlandt 
progenies also showed no mosaic. 
To determine whether this peculiar incidence of mosaic had any 
relation to the node at which the pods were borne, the seeds from nine 
mosaic Midwest and seven mosaic Haberlandt plants were harvested 
separately by nodes in 1921 and tested in the greenhouse. No par¬ 
ticular relation was found between the percentage of mosaic seedlings 
and the location of the node at which the seed was borne. Numbering 
the bearing nodes from the top down, the second, third, fourth, and 
seventh yielded the most mosaic seedlings in the Midwest plants and the 
fourth node in the Haberlandt plants. Numbering the bearing nodes 
from the base upward, the fourth, seventh, and eighth yielded the 
most mosaic in the Midwest plants. 
