SORGHUM SMUTS AND VARIETAL RESISTANCE 
21 
selection of the Standard broomcorn made in 1906 by A. H. Leidigh 
at Channing, Tex. It resembles the Standard in the length and 
texture of the brush but is dwarf in stature. The second variety of 
dwarf broomcorn is known as Dwarf. Its exact origin is not known. 
Various names have been applied to it; for example, California 
Golden Dwarf, Dwarf, Dwarf Evergreen, Evergreen Dwarf, Japanese 
Dwarf, and Oklahoma Dwarf. It ranges in height from 3^ to 6 feet. 
At present this variety comprises about two-thirds of the total 
broomcorn crop of this country. 
All three varieties of broomcorn have been used in these experi- 
ments to determine their reaction to the covered kernel smut. The 
data are presented in Table 3. 
Table 3. — Results of inoculation experiments with spores of covered kernel smut 
on varieties of broomcorn at five stations in one or more of the seven years from 
1915 to 1921, inclusive 
Number of plants grown 
Percentage of plants infected 
Variety, strain, and station 
1915 
1916 
1917 
1918 
1919 
1920 
1921 
1915 
1916 
1917 
1918 
1919 
1920 
1921 
Aver- 
age 
Acme, C.I. No. 243: 
Manhattan. _ 
90 
~ii§ 
31.1 
37." 2 
31. 1 
Brooklyn... 
37.2 
Amarillo... . . ... 
771 
"389 
13.1 
12." 1 
13.1 
Rosslyn . 
12. 1 
Acme, C. I. No. 243-7-2: 
Manhattan. 
176 
150 
64 
92 
12.5 
2.0 
12.5 
14.1 
9. 5 
Brooklyn. . .. 
19 
21.1 
21. 1 
Amarillo.. 
181 
34 
26 
372 
11.0 
8.8 
11.5 
15.1 
13.4 
Rosslyn 
129 
13.2 
13.2 
Dwarf, Mo. No. 7: 
Columbia 
Dwarf, C I. No. 442: 
Manhattan . 
221 
.... 
145 
170 
153 
31 
54 
72 
74 
373 
6.3 
7.6 
8.2 
5.2 
3.2 
18.5 
9.7 
8.1 
20.4 
6.3 
8.2 
Amarillo __ ... 
15.2 
Rosslyn... 
60 
10.0 
10.0 
Standard, Mo. No. 8: 
Columbia .. 
46 
446 
545 
109 
115 
87 
82 
4.3 
24.2 
36.3 
31.2 
23.5 
1. 1 
6.1 
4.3 
Standard, Mo. No. 23: 
Columbia . . ... 
22.3 
Standard, Mo. No. 24: 
Columbia ... . . ... 
31.0 
Brooklyn.. . 
22 
27.3 
27.3 
Standard, Mo. No. 25: 
Columbia 
132 
120 
115 
63 
68 
66 
30.3 
29.2 
21.7 
6.3 
11.8 
7.6 
22.6 
Standard, Mo. No. 26: 
Columbia . ... 
321 
40.8 
34.2 
Standard, Mo. No. 64: 
Columbia .. 
16.6 
Brooklyn.. . . 
16 
"20 
11 
94 
12.5 
35."6 
45.5 
28.7 
12.5 
Standard, Mo. No. 71: 
Columbia... . ... 
74 
9.5 
9.5 
Brooklyn ... 
35.0 
Rosslyn .. . 
84 
.... 
.... 
.... 
10.7 
10.7 
Standard, Mo. No. 198: 
Brooklyn.. ... 
45.5 
Standard, Mo. No. 199: 
Brooklyn... . 
28.7 
Standard, C. I. No. 446: 
Manhattan... 
144 
140 
137 
78 
11.1 
10.0 
12.4 
9.0 
10.8 
Brooklyn 
26 
23.1 
23.1 
Amarillo .. ... 
173 
97 
55 
311 
5.8 
12.4 
18.2 
12.5 
11.2 
Rosslyn .. 
78 
.... 
.... 
5.1 
5.1 
Acme broomcorn (C. I. No. 243) was grown one year at each of the 
stations except Columbia. The infection varied from 12.1 per cent 
at Rosslyn to 37.2 per cent at Brooklyn. A selection of Acme 
(C. I. No. 243-7-2) also was grown at the same stations. The aver- 
age percentage of infection at Manhattan in four years was 9.5, the 
lowest (2 per cent) in 1917 and the highest (14.1 per cent) in 1919. 
