8 
BULLETIN 1275, U. S. DEPARTMENT OF AGRICULTURE 
Table 2 records the counts of the total number of plants, the num- 
ber infected, and the percentage infected at all stations except Man- 
hattan, Kans. At the Kansas station no plant counts were made, 
and accordingly the data recorded in the table are based on the pani- 
cle counts. 4 Records were taken at all the other stations on the total 
number of panicles and the number infected, but these data are not 
included in the table. In general, the percentage of smut calculated 
on the basis of infected panicles is considerably lower than that cal- 
culated on the basis of infected plants. This is explained by the fact 
that a considerable number of plants are only partially smutted 
and so bear both sound and smutted panicles. All partially smutted 
plants shown in the table, however, are recorded as infected. 
For purposes of comparison the previously published data obtained 
at Columbia, Mo., are included. Some corrections in varietal names 
have been made, and the data from a few strains which were found 
to be mixed are omitted. 
Table 2. — Results of inoculating seed of varieties and strains of different species 
of Avena with spores of Ustilago avenae and U. levis at the stations and in the 
years indicated 
[Where two circled figures follow the name of a station (Columbia, column 2) the first one indicates the 
number of years that the variety was grown in the series with Ustilago avenae and the second one the 
number of years it was grown in the TJ. levis series. A single circled figure indicates that the variety was 
grown in both series the number of years thus indicated.] 
Station and year 
Plants from seeds inoculated with— 
Species, variety, and strain 
of oats 
Ustilago avenae 
Ustilago levis 
Total 
num- 
ber 
Infected 
Total 
num- 
ber 
Infected 
Num- 
ber 
Per 
cent 
Num- 
ber 
Per 
cent 
Avena brevis: 
S.N.I 
S.N. 77 
Columbia ®© 
Columbia ©© 
Columbia, 1920 
Ames, 1920 
278 
490 
80 
472 
72 
118 
166 
227 
60 
132 
176 
280 
111 
691" 
190 
24 
60 
173 
151 
58 
112 
329 













o" 







1 













........ 







.3 
405 
347 
80 
492 
130 
78 
157 
244 
60 
143 
127 
76 
171 
94 
433 
219 




















Aberdeen, 1920 
Brooklyn, 1921 
.Brooklyn, 1922 
[Columbia ©.. . 




Columbia, 1920 
Ames, 1920 


S.N. 134 
Aberdeen, 1919 
Aberdeen, 1920 
Manhattan, 1920 
Pullman, 1920 
Brooklyn, 1921 
Brooklyn, 1922 
Aberdeen, 1919 
Columbia, 1920 
Ames, 1919 
Ames, 1920.. 


S. N. 139— 




60 
57 
170 
45 
80 
419 
61 
90 
86 
50 
142 
65 
114 
113 
104 
87 
■1.M 















2 
2 



S.N. 142 , 
Aberdeen, 1919 
Aberdeen, 1920 
Manhattan, 1920 
Pullman, 1920 

o 


Brooklyn, 1921 
(Brooklyn, 1922 
Columbia, 1920 
Amos, 1920. 
157 
223 
37 
109 
33 
40 
77 
116" 
•191 







..... 








........ 





S.N. 289, C.I. 1783 (late- 
maturlng strain). 
Aberdeen, L919 
Aberdeen, 1U20 
Manhattan, 1920—. 
Pullman, 1920.. 
Brooklyn, 1921 
Brooklyn, 1922.. 




2.3 
.4 
<iri all ' totals have been given the counts have excluded the figures for Manhattan. 
