184 
Vol. XXVII. No. 4 
Journal of Agricultural Research 
J ala ° n the occurrence of purple-leaf symptoms developed in experimental 
plats 0] Yellow Dent corn grown in 1920 near Bloomington, III., from seed ears selected 
]rom plants not showing purple-leaf symptoms, the seed being untreated 
Row No. 
3- 
4 - 
5- 
6 . 
7- 
8 . 
9 - 
10. 
11. 
12 . 
*3- 
14. 
*5 • 
16. 
I 7- 
18. 
19. 
20. 
21. 
22. 
23- 
24. 
25- 
26. 
27- 
Total .. 
Hills, 
total 
number. 
Suckers. 
Plants 
(main 
stalks) 
without 
purple 
Plants (main stalks) with purple leaves. 
Total. 
Purpled. 
Total 
number. 
Bearing. 
leaves. 
Ears. 
Nubbins. 
Barren. 
*5 
25 
2 
12 
3 
2 
I 
O 
14 
25 
3 
12 
2 
2 
O 
O 
16 
26 
2 
15 
I 
I 
O 
O 
II 
13 
I 
IO 
I 
I 
O 
O 
15 
21 
O 
15 
O 
0 
O 
O 
17 
33 
4 
15 
2 
I 
O 
I 
17 
! 21 
0 
l6 
I 
O 
I 
O 
*5 
! 18 
7 
14 
I 
I 
O 
O 
16 
1 19 
0 
l6 
O 
O 
O 
O 
13 
30 
1 
12 
I 
I 
O 
O 
19 
29 
1 
l8 
I 
O 
I 
O 
17 
26 
4 
l6 
I 
I 
O 
O 
5 
8 
0 
5 
O 
O 
O 
O 
17 
16 
2 
17 
O 
O 
O 
O 
17 
11 
0 
17 
O 
O 
O 
O 
17 
39 
0 
17 
O 
O 
O 
O 
19 
44 
9 
17 
2 
I 
I 
O 
15 
29 
3 
15 
O 
O 
O 
O 
16 
28 
2 
16 
O j 
O 
O 
O 
17 
38 
6 
!5 
2 J 
O 
2 
O 
18 
24 
3 
18 
O ! 
O 
O 
O 
18 
35 
6 
16 
1 
2 1 
I 
I 
O 
*3 
28 
1 
13 
1 
0 ! 
O 
O 
O 
12 
27 
0 
12 
01 
O 
O 
O 
II 
28 
6 
IO 
11 
I 
O 
O 
l6 
35 
1 
15 
1 j 
I 
O 
O 
12 
25 
2 
IO 
2 j 
I 
I 
O 
408 
701 
66 
384 
24 i 
!5 
8 
I 
Table IV presents data which, when expressed in percentages, show 
that 5.9 per cent of the plants had the color symptom that was used as 
a basis in these data, and the relative percentages of these plants that 
were barren (4.2), nubbin-producing (33.3), and ear-producing (62.5). 
In 1919, ears of Yellow Dent com were selected from purple plants 
with a view to determine their field performance in 1920. In planting 
the plats, 40 kernels were planted singly 14 inches apart in rows 42 inches 
apart. The results from 23 of these ears are given in Table V. 
On the basis of the data presented in Table V, it is found: (1) That 
46.6 per cent of main stalks and 43.2 per cent of all suckers in these 
rows showed the purple-leaf symptoms; (2) that of the plants with the 
purple-leaf symptom, 55- 1 P er cent produced ears, 27.5 per cent produced 
nubbins, and 17.4 per cent were barren; and (3) that the mean yield of 
plants showing the purple-leaf symptom was 176 gm. per plant as 
compared with 264.2 gm. per plant from apparently healthy plants 
in the same ear rows, thus showing 33.4 per cent reduction in yield 
per plant by those plants having the purple-leaf symptom. 
Along with the experiments referred to in Tables IV and V, another 
experiment was conducted in 1920 to determine if seed treatment with 
