July 1,1925 Productiveness and Deleterious Characters in Corn 
95 
In order to provide more opportunity for infection, stable manure 
with which large quantities of smut spores had been mixed was 
spread on the experimental plat in the spring. Later, a water sus¬ 
pension of conidia of the smut fungus from pure culture was applied 
co the growing points of the plants after they had been wounded with 
a sharp wire. 
A summary of the data on freedom from smut in the Garrick 
lines in 1923 is given in Table XII, classified according to the number 
of kernel rows on the parent ears. Data on freedom from smut in 
the parent ear rowsin 1922 also are given. All of the few-rowed parent 
ears used in this experiment were from ear rows that were entirely 
free from smut in 1922, as was one of the many-rowed parent ears. 
The other seven parent ears of the many-rowed class were from the 
most nearly smut-free ear rows of this class from which selfed ears 
were obtained in 1922. Inasmuch as approximately equal numbers 
of hand pollinations were attempted in the rows of both classes in 
1922, this failure to obtain selfed ears from the many-rowed class 
furnishes an interesting side light on the greater vigor of the plants 
from the few-rowed parent ears. 
Table XII .—Data on the relation of number of kernel rows on the parent ears 
to freedom from smut in selfed lines of Garrick grown at Arlington Experiment 
Farm , Rosslyn , Va., in 1922 and 1928 
Parent ears with 8 to 12 kernel rows 
Parent ears with 14 to 20 kernel rows 
Fam¬ 
ily 
Parent rows! 
, 1922 
Progeny rows, 1923 
Fam¬ 
ily 
Parent rows, 
, 1922 
Progeny rows, 1923 
No. 
Ear 
row 
No. 
Total 
plants 
Smut- 
free 
plants 
Ear 
row 
No. 
Total 
plants 
Smut- 
free 
plants 
No. 
Ear 
row 
No. 
Total 
plants 
Smut- 
free 
plants 
Ear 
row 
No. 
Total 
plants 
Smut- 
free 
plants 
P. ct. 
P.ct. 
P.ct. 
P.ct. 
f 76 
20 
100.0 
{ 4 
89 
49.4 
f 45 
20 
95.0 
20 
117 
29.9 
49 
85 
51.8 
86 
\ 49 
22 
100.0 
22 
77 
64.9 
5 
103 
79.6 
l 69 
26 
88.5 
23 
84 
31.0 
1 78 
19 
100.0 
7 
101 
75.2 
1 8 
102 
80*4 
f 26 
17 
100.0 
10 
l 11 
107 
114 
77.6 
84.2 
r 51 
18 
94.5 
1 
r 25 
26 
132 
113 
62.1 
61.9 
54 
\ 
f 13 
97 
93.8 
99 
29 
108 
61.1 
I 30 
20 
100.0 
1 14 
98 
81.6 
l 256 
38 
60.5 
30 
108 
29.6 
1 16 
113 
85.0 
. 31 
115 
17.4 
l 17 
123 
90.2 
Total ear 
Total ear 
rows_ 
76 
100.0 
1,132 
« 78.2 
rows_ 
124 
« 83.9 
854 
a 44.6 
° Computed directly from the basic data 
Only 2 of the 11 rows from ears with from 8 to 12 rows of kernels 
had lower percentages of smut-free plants than the most nearly 
smut-free rows from ears s with 14 to 20 rows of kernels in 1923, 
and the rows from ears with fewer kernel rows averaged 33.6 per 
cent mpre smut-free plants than the rows from ears with more 
kernel rows. 
The percentages of smut-free plants were lower in 1923 than in 
the parent-ear rows in 1922. This may have been due to a differ¬ 
ence in the seasons, to the artificial inoculation of soil and plants in 
1923, or to the fact that the data for 1922 are based only on ear 
rows as selected having the fewest smutted plants. In any event, 
