Jan. 26,1924 
185 
The Black-Bundle Disease of Corn 
corrosive sublimate would eliminate the purple-leaf symptoms. In the 
matter of control the results were almost negative, but the data obtained 
were important in other ways, and hence they are included at this point. 
The ear rows were planted with seed from the same ears as those 
used for the experiment referred to in Table V, which were selected 
from purple-leaf plants. The kernels were planted singly 14 inches apart 
in rows 42 inches apart. This seed was treated by immersion for one-half 
hour in a 1 : 1000 mercury bichlorid solution. The results are given in 
Table VI. 
TablB V.—Data on the occurrence of purple-leaf symptoms and on yield of Yellow 
Dent corn grown near Bloomington, III., IQ20, in ear-row experimental plats, from 
seed ears selected from plants showing purple-leaf symptoms in IQIQ, the seed used m 
IQ20 being untreated 
Row No. 
Number of— 
Plants without purple- 
leaf symptoms. 
Plants with purple-leaf symptoms. 
Plants. 
Suckers. 
Purple suckers. 
Number 
of— 
Yield. 
Number 
of— 
Yield. 
Number 
pro¬ 
ducing— 
Barren. 
1 
ca 
s 
Ears. 
I 
Average per 
plant. 
Plants. 
Ears. 
i 
Total. 
Average per 
plant. 
Ears. 
Nubbins. 
Gm. 
Gm. 
Gm. 
Gm . 
1. 
22 
44 
25 
II 
11 
2,761 
251 
n 
10 
2,080 
189 
7 
3 
X 
2.! 
25 
31 
24 
II 
11 
2,448 
223 
14 
9 
2,012 
144 
5 
4 
5 
3. j 
27 
31 
10 
19 
20 
4,848 
255 
8 
7 
1,402 
i 75 
4 
3 
X 
31 
47 
28 
7 
7 
1,944 
278 
24 
19 
3,418 
142 
10 
9 
5 
H *.. 
5.. 
25 
38 
19 
8 
8 
2,068 
259 
17 
15 
2,840 
167 
8 
7 
2 
6. 
32 
43 
11 
20 
20 
5,661 
283 
12 
10 
2,268 
189 
7 
3 
2 
7. 
26 
36 
18 
8 
8 
2,071 
259 
18 
16 
3,288 
183 
10 
6 
2 
8. 
25 
26 
15 
12 
12 
3 tI 72 
264 
13 
9 
1,942 
149 
6 
3 
4 
9. 
31 
Si 
13 
19 
1 22 
5,6oo 
295 
12 
14 
3,055 
255 
9 
2 
1 
10. 
29 
22 
12 
17 
! *7 
4,766 
280 
12 
12 
2,192 
183 
7 
5 
0 
11. 
24 
30 
18 
14 
14 
3,972 
284 
10 
9 
2,273 
227 
8 
1 
X 
12.. 
29 
43 
25 
7 
7 
2,000 
286 
22 
20 
4,044 
184 
16 
4 
2 
13. 
32 
43 
18 
18 
18 
4,519 
251 
14 
14 
2,636 
188 
7 
7 
0 
14. 
28 
30 
II 
18 
18 
5,253 
292 
10 
6 
1,386 
139 
4 
2 
4 
15. 
17 
10 
2 
14 
14 
4,098 
293 
3 
3 
792 
264 
2 
1 
0 
16. 
30 
40 
17 
19 
19 
5,548 
292 
II 
9 
2,509 
228 
9 
0 
2 
17. 
31 
44 
7 
25 
26 
7,255 
290 
6 
4 
993 
166 
4 
0 
2 
18. 
34 
26 
8 
18 
18 
4,172 
232 
16 
13 
3 ,on 
188 
7 
6 
3 
19. 
11 
12 
3 
9 
9 
1,873 
208 
2 
2 
200 
100 
1 
1 
O 
20 .. 
16 
9 
3 
9 
9 
2, 228 
248 
7 
6 
1,134 
162 
4 
2 
1 
21. 
15 
18 
11 
3 
3 
672 
224 
12 
7 
1,600 
133 
5 
2 
5 
22.. 
IS 
15 
0 
12 
12 
3,494 
291 
3 
2 
214 
71 
1 
1 
1 
23. 
14 
15 
6 
6 
6 
1,426 
238 
8 
6 
1,340 
168 
5 
1 
2 
Total. 
569 
704 
304 
304 
309 
81,849 
264. 2 
265 
222 
j 46,629 
176 
146 
73 
46 
Table VI shows that, although treated for one-half hour in a 1 :iooo 
solution of mercury bichlorid, a high percentage (42.7 per cent) of purple 
plants resulted from planting seed selected from purple plants and that 
purple plants yielded less (20.6 per cent) than apparently normal plants 
from the same ears. A comparison of this table with Table V is shown 
in Table VII. . , . 
It will be noted from the summaries given in Table VII that, although 
no important effect resulted from this treatment, there was a slight 
decrease in the percentage of plants with the purple-leaf symptom and 
an increase in the yields of both healthy and diseased plants. In general, 
however, the results show the desirability of selecting seed ears only 
from plants not showing the purple-leaf symptom. This statement is 
