Millet Smuts and Their Control 
17 
handling the crop is especially deserving of consideration, particularly 
should there be only small amounts of smut in the crop. 
CONTROL EXPERIMENTS 
The following experiments were carried on during the seasons 
of 1916 and 1917 on the Experimental Station grounds at P'ort Collins, 
Colorado. The experimental plots were irrigated; the soil consisted 
of a loan-or silty loam. 
A large amount of smut material of both species (U. crameri and 
U. panici-miliacei) was secured for the purpose of inoculating various 
varieties of millet. The smut spores of U. crameri zuere thoroly 
mixed with the seed of the following varieties: Broom Corn, Com¬ 
mon United States 1429, German U. S. 33133, Goldmine, Japanese, 
Hungarian, Kursk, Pearl, Proso, Red Hog, and Siberian. Spores of 
the other species (U. panici-miliacei) were mixed with these varieties 
in the same manner. The system of plotting the experiments was 
TABLE I.—RESULTS OF INOCULATION WITH THE TWO SPECIES OF 
SMUT FOR 1916 & 1917. 
Ustilago crameri Ustilag-o panici-miliacei. 
Percentage of 
Percentage of Percentage of 
smut 
smut 
smut 
1916 
1917 
1916 
Broom Corn 
0 
0 
30 
Common 
45-55 
58 
0 
German 
50-60 
72 
0 
Gold Mine 
50-60 
— 
0 
Hungarian 
55-60 
55 
0 
Japanese 
0 
0 
0 
Kursk 
30-35 
35 
0 
Pearl 
immature 
immature 
immature 
Proso 
0 
9 
35 
Red Hog 
0 
— 
35 
Siberian 
31-35 
32 
0 
modified somewhat the second season 
from that used in 
the first, i. e. 
instead of growing 
plants inoculated 
with both species 
in the same 
plot, these were plotted separately the second season. 
Plot I.— All varieties inoculated with U. panici miliacei; no dis¬ 
infection of seed. 
Plot 2.—All varieties inoculated with U. crameri'; no disinfection 
of seed. 
Plot 3.—All varieties inoculated with U. crameri; seed disin¬ 
fected with formalin i pint to 40 gallons by soaking for i hour. 
Plot 4.—Same as plot 3 except plants were inoculated with U. 
panici-miliacei. 
Plot 5.—All varieties inoculated with U. crameri; seed disinfect¬ 
ed with formalin, i pint to 40 gallons water, by sprinkle method. 
