i 8 
Colorado Agricultural College 
Plot 6.—Same as plot 5 except plants were inoculated with U. 
panici-niiliacei. 
Plot 7.—Check.—Clean seed planted in clean soil. 
Careful notes were kept on the plots thruout the season. The 
percentage of smut in each was determined in August and October. 
TABLE II.—RESULTS OF INOCULATION WITH USTIL.AGO CRAMBRI.— 
SHOWS DIFFERENCES IN THE AMOUNT OF SMUT APPARENT ON AUG. 
15th. AND OCT. 30. 
Variety 
Percentage of smut 
Aug. 15 
Percentage of 
smut Oct. 30 
Broom corn millet 
Common 
• 
German 
Hungarian 
Kursk 
Pearl 
Proso 
Siberian 
Japanese 
not headed 
12 
35 
27 
24 
not headed 
7 
27 
not headed 
0 
58 
72 
55 
not headed 
9 
32 
0 
METHODS OF ELIMINATING SMUT 
It is a well known fact that one of the b st methods for the pre¬ 
vention of smut in the crop is that of securing seed free from all 
evidence of smut. Obviously, this must be accomplished by securing 
seed from fields that had no smut in them. It is difficult to do this 
owing to the difficulty with which the smut is recognized in the field. 
The cleanliness of millet seed can hardly be judged by a mere exam¬ 
ination. Hundreds of spores may be lodged upon the grain yet be 
entirely indistinguishable on casual examination. A thoro examina¬ 
tion of both field and harvested grain is necessary to judge the pres¬ 
ence or absence of smut in any small quantities. If more attention 
could be given to the source and cleanliness of the seed, the losses 
would be greatly diminished. It is usually the case tliat imported 
seed is bought and sown with no knowledge whatever of the field with 
respect to smut infection or even subsequent handling of the grain 
where, if it were associated with smutted grain, it would invariably 
become contaminated to some extent. Hence, it is advisable to have 
some knowledge of the field from which the seed mill T comes, and if 
this knowledge is impossible, there is one other alternative, and that 
is seed treatment. 
It is clear from the foregoing that every spore which goes into 
the soil in contact with the seed is capable of reproducing the smut, 
since it is from these spores that the millet becomes infected. For 
