SORGHUM SMUTS AND VARIETAL RESISTANCE 
27 
Table 5. — Results of inoculation experiments with spores of covered kernel smut 
on varieties of kafir at five stations in one or more of the seven ijears from 1915 to 
1921, inclusive — Continued 
Number of pla 
nts 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 
Pink, Mo. No. 37: 
134 
52 
76.9 
25.0 
62.3 
17 
64.7 
64.7 
Pink, Mo. No. 94: 
55 
32.7 
32.7 
50 
14.0 
14.0 
Pink, C.I. No. 432: 
105 
124 
8 
234 
101 
31 
113 
694 
12.4 
12.9 
37.5 
14.1 
44.6 
29.0 
22.7 
59.3 
30.8 
39.5 
29.6 
39.1 
25.1 
27 
18.5 
.... 
18.5 
Pink, Kansas station: 
66 
43 
115 
29.4 
29 
64 
29.6 
Pink.F. C.I. No. 1930: 
...31.0 
31.0 
Pink (late), F. C. I. No. 9439: 
43.8 
43.8 
Pale Red, C. I. No. 316: 
95 
173 
26 
141 
131 
14.7 
28.9 
42.3 
-- 
38. 3 34. 4 
30.7 
10 
50.0 
50.0 
74 
107 
415 
6.8 
33.6 
.... 
23.9 ___ 
23.5 
Rosslyn. 
21 
14.3 
14.3 
Red, Mo. No. 1: 
Columbia 
229 
318 
100 
47 
16.6 
36.2 
49.0 
10.6 
16.6 
Red, Mo. No. 36: 
Columbia . _ 
36.3 
8 
"""§ 
37.5 
25."6 
37.5 
Red, Mo. No. 80: 
55 
7.3 
7.3 
Brooklyn... __ 
25.0 
Rosslyn 
37 
— - 
15.4 
35.1 
35.1 
Red, Mo. No. 90: 
26 
15.4 
11 
36 4 
36.4 
Rosslyn 

28 
14.3 
.... 
18 8 
14.3 
Red, Mo. No. 202: 
Brooklyn.. . 
32 
18.8 
Red, Kansas station: 
Manhattan 
92 
121 
16.8 
9.1 
23.0 
34.8 
39.7 
34.8 
Red, C. I. No. 34: 
Manhattan 
107 
175 
135 
21.0 
55 
65.5 
65.5 
112 
78 
2 
307 
9.8 
3.8 

?fi 7 
19.2 
Rosslyn .. 
459 
54 7 
94 ? 
54 7 
Red, C.I. No. 323: 
Brooklyn.. .. 
33 
24.2 
1 
Eight different strains of Blackhull kafir were grown at Columbia, 
and all proved to be highly susceptible. A total of 1,658 plants 
was obtained, 581, or 35 per cent, showing infection. Three of the 
same strains were grown at Brooklyn, 13 out of 34 plants, or 38.2 
per cent, being infected. Blackhull kafir (C. I. No. 71) was grown 
five years at Manhattan, the average infection being 10.5 per cent. 
It was also grown three years at Amarillo, where the average per- 
centage of infection was 12.6. At Rosslyn it gave negative results, 
while at Brooklyn 19.4 per cent of the plants were infected. Black- 
hull kafir (C. I. No. 204) was grown two years at Manhattan, the 
average percentage of infection being 24.4. At Amarillo 26 per 
cent of the plants were infected, at Rosslyn 33 per cent, and at 
Brooklyn 61.1 per cent. Blackhull kafir (C. I. No. 207), grown six 
years at Manhattan, showed an average infection of 16.2 per cent, 
while the 4-year average at Amarillo was 19.3 per cent. At Rosslyn 
21.1 per cent of the plants were infected. Blackhull kafir (F. C. I. 
No. 2036) grown at Brooklyn showed 45.3 per cent infection. Black- 
