SORGHUM SMUTS AND VARIETAL RESISTANCE 
29 
RESULTS WITH DURRA 
Apparently the dun-as {3, 7) were introduced into the United 
States from the Barbary States of northern Africa, where the leading 
variety of sorghum is a white durra called bechna, or beshna, by the 
Cabyles of Algeria. It is practically identical with the variety in- 
troduced into this country as White Eg}^ptian corn. A very similar 
w T hite durra is found throughout Turkestan, Mesopotamia, Syria, 
and Arabia. A red-seeded durra, very similar to our Brown durra 
and probably the original form of it, also is found among the moun- 
tain tribes of Algeria and in certain parts of the northern Sahara. 
This variety, however, has not been found in Arabia or elsewhere in 
southwestern Asia. In India many varieties somewhat distantly 
related to our durras are grown. They constitute the principal vari- 
eties of kharif jowar, or the monsoon sorghum crop, which is sown 
in June or Julv and harvested in October or November. 
Table 6. — Results of inoculation experiments with spores of covered kernel smut on 
varieties of durra 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 
191719181919 
1920 
1921 
1915 
1916 
1917 
1918 
1919 
19201921 
Aver- 
age 
Brown, Mo. No. 30: 
289 
! 
110 59 
540 
38. 2 13. 6 
45.0 
Brown, Mo. No. 74: 
85 


10 
50.0 
50.0 
30 
10.0 
10.0 
Brown, C. I. No. 183: 
32 
34 
38 
13 
147 
19 
127 
133 
86 
148 
137 
100 
68 
259 
69 
385 
73 
301 
18.8 
8.8 
36.8 
30.8 
13.6 
10.5 
7.1 
11.3 
12.8 
8.8 
95 
12.0 
30.7110.4 
48. 0133. 3 
15.5 
Brown, C. I. No. 246: 
32.8 
200, 107 
165 43 
229 103 
49. 5 37. 4 27. 8 
35.5 
Brown, S. P. I. No. 17537: 
4.8 
3.1 
30.2 
26.2 
8.2 
12.6 
11.0 
11.3 
White, Mo. No. 6: 
900 

8.6 

White, Mo. No. 16: 
116 
"1 
8.6 
50 
50.0 
White, Mo. No. 32: 
267 
88 
101 
37.1 
3.4 

22.4 
White, Mo. No. 200: 
31 
41.9 
82.~8 
41.9 
White, C. I. No. 81: 
74 
165 
48 
34 
101 
14.9 
10.3 
25.0 
52.9 
12.9 
16.8 
29 
82 8 
65 
391 
203 
278 
9.2 
9.5 







27.5 
10.0 
13.0 
6.7 
9.7 

.6 
1 3 
2.5 
1.7 
1.0 
46.4 
2.0 
.9 
19.0 
Rosslyn 
18 
---- 
22.2 
— - 
22.2 
White, C. I. No. 437: 
63 
33 
74 
81 
31 
5 
140 
48 
153 
60 
54 
30 
60 
171 
76 
116 
198 
101 
332 
2 9 
.8 
White, C.I. No. 529: 
.7 
Amarillo . .. 
362, 
3 
— -j— 
.2 
White, S. P. I. No. 14518: 
14 
. 30 
158 
438 
76 
324 
18 
216 

6.7 


3.9 
15.4 
16.7 
2.8 

49 
71 
84 
115 
56 
22 
12.2 

33.3 
39.1 
16.1 
9.1 
9.5 
White, S. P. I. No. 14628: 
Manhattan. 

202 
96 
518 
68 
87 
.5 
14.6 
16.4 
4.4 

.... 
1 
White, S. P. I. No. 17535: 
21 3 
Amarillo .. 
18.3 
White, S. P. I. No. 38592: 
11 2 
Amarillo 
2.8 
106639°— 25f- 
