622 
Journal of Agricultural Research 
Vol. XXIII. No. 8 
Some strains of Reid Yellow Dent have proved to be very susceptible 
to the root, stalk, and ear rot diseases when planted in infested soil or 
when the seed was inoculated at planting time with Gibberella saubinetii. 
Frequently ears of such strains of com are so badly infected that it is 
impossible to select from them seed that is reasonably disease-free, 
regardless of the number of ears tested on the germinator. Seed from 
such a strain of Reid Yellow Dent was included in the inoculation 
experiments conducted in cooperation with Dr. James G. Dickson in 
1921 on clean and infested soil, including early and late plantings. Com 
grown from this seed proved to be very susceptible to injury by the 
organism (Gibberella saubinetii) with which it was inoculated. The com 
in the inoculated plots had a slightly reduced stand and a much lower 
percentage of vigorous plants than in the uninoculated plots planted with 
the same lot of seed. The differences in percentages of strong plants in 
corn grown from this diseased, susceptible seed and in that grown from 
the nearly disease-free seed were very similar to those reported in Tables 
XXI to XXIV and XXVI. The very best seed that could be selected 
from this strain by use of the germination test averaged 27.5 per cent 
Table XXVII. Total yield and yield of marketable corn as influenced by diseased. a 
susceptible , © and nearly diseasefree c seed planted at different dates on chan soil 
and infested soil at Bloomington , III., in 1921 
INFESTED SOU, 
Yield data. 
Total 
stand. 
acre. 
Marketable 
Unmarketable 
i 
and 
is. 
Date of 
corn. 
com. 
u 
plant¬ 
ing. 
Condition of seed. 
otal yield per 
i 
1 
i 
otted ears anc 
ted nubbins 
Chaffy ears 
chaffy nubbix 
§ 
j 
1 
s 
ield per 
acre. 
3 -a 
P 
v >» 
est per 
bushel. 
ield per 
acre. 
« . 
m-m 
«t ja 
11 
ist per 
bushel. 
jo 
•a 
a 
a 
g 
Ph 
fc- 0 
>* 
w 
Original composite of 
Bus. 
Bus. 
Lbs. 
Bus. 
Lbs. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
May xo 
susceptible seed a . 
Selected composite of 
312 
86.7 
77-6 
48.0 
61.8 
54-5 
29.6 
38.2 
48.7 
53-9 
34-6 
2.2 
9*3 
susceptible seed & . 
Nearly disease-free com¬ 
333 
92.5 
78-3 
50.0 
63-9 
54.2 
28.3 
36. X 
47-7 
54-2 
34-9 
2.5 
8-5 
posite c . 
Original composite of 
354 
98.3 
89.7 
693 
77.2 
58.5 
20.4 
22.8 
51-5 
7 i -3 
17 - 7 
3-2 
7-8 
susceptible seed. 
320 
88.8 
76-5 
38.8 
50.7 
49.0 
45*5 
8-3 
30 
Selected composite of 
7*7 
49 * 3 
52.0 
42.0 
4*2 
susceptible seed. 
Nearly disease-free com¬ 
334 
92.8 
71.8 
39-7 
55*3 
52-5 
32.1 
44-7 
49.2 
49-5 
40.5 
2.4 
7-6 
posite. 
98-3 
81.5 
27.3 
51-3 
68.5 
25.0 
5-2 
59 * 3 
72 . 7 
50.5 
22 2 
x* 3 
CLEAN SOIL 
f Original composite of 
susceptible seed. 
3x9 
88.6 
81.0 
SX-8 
63-9 
53*5 
29.2 
36.x 
49-2 
54-7 
30.8 
6.9 
Selected composite of 
susceptible Med. 
336 
93*4 
42. s 
56.X 
54-5 
33-2 
43-9 
48.7 
48.0 
32.5 
8.8 
Nearly disease-free com¬ 
posite. 
(Original composite of 
346 
96.x 
90-6 
73-o 
80. s 
58.3 
17-6 
X9-5 
50.8 
71.1 
19.0 
1.9 
susceptible seed. 
332 
92.1 
94-9 
SG-B 
53-6 
41.0 
43*2 
49*7 
50.2 
38.0 
Selected composite of 
53 -S 
3- 5 
susceptible Med. 
345 
95-8 
A 
55 - 2 
57-8 
53-8 
40.2 
42.2 
50.0 
51-5 
37-o 
4.0 
Nearly disease-free com- 
, posite. 
let 
98.2 
8l.6 
n 
57-8 
23-X 
52.6 
73-9 
x.6 
000 
* 
17 * 9 
22.x 
I0« 2 
f 96.5 per cent viable and 38.6 per cent diseased. 
• 98.9 per cent viable and 37.5 per cent diseased. 
e 99.9 per cent viable and 3.5 per cent diseased. 
