32 
BULLETIN 1275, U. S. DEPARTMENT OF AGRICULTURE 
Table 6. — List of varieties and strains of Avena sativa found to be highly susceptible 
to both loose and covered smuts of oats 
Variety or strain 
Seed 
No. 
Variety or strain 
Seed 
No. 
Canadian.. 
119, 190 
146 
310 
150, 197 
154 
202, 275 
41 
205 
156 
June .. 
157 
C. I. No. 603 
Kherson (selection) 
159 
North Finnish 
216 
Early Champion .. 
Var. praegravis _ 
13, 61, 62 
219 
Golden Drop ... ... 
Probsteier .. 
Golden Rain.. . ... 
Silvermine .. 
222 
Silvermine (selection) 
165, 231 
166 
Irish Victor 
Sixty-Day 
Japan (selection) . 
Victor 
126,233 
A fifth group includes several varieties which usually have had 
higher percentages of infection from Ustilago avenae than from U. 
levis. The varieties included in this group are given in Tahle 7. 
Table 7. — List of varieties and strains of Avena sativa which usually have had 
higher percentages of infection from Ustilago avenae than from U. levis 
Variety or strain 
Seed No. 
Variety or strain 
Seed No. 
183 
341, 342 
116 
189 
118, 186 
145 
359 
193, 345 
309 
149 
196 
152, 200 
316 
Irish Victor ... 
206 
Bicknell (selection) 
Japan 
207 
Black Diamond ._ 
Lincoln __ 
212, 214 
162 
Black Mogul 
Monarch (selection) 
Black Norway . 
Var. mutica 
11, 42, 46, 52, 57, 331 
280 
C.I. No. 602. 
Nebraska No. 21 
Culberson ... . 
Var. nigra . .. .. 
12,59 
322 
Danish 
Scottish Chief.. . 
124 
Danish Island 
Swedish Select. . . 
229 
Dwarf Culberson... . .. 
Var. trisperma 
64 
Early Gothland 
White Queen . 
327 
Green Russian. .. 
In some cases the variety is only slightly or moderately susceptible 
to the loose smut, and the difference in the behavior of the variety 
to the two smuts is not so evident. In other cases the difference 
between the percentage of infection with loose smut and with cov- 
ered smut is very marked. 
The sixth and final group includes five varieties which appear to 
be somewhat more susceptible to Ustilago 'levis than to U. avenae, 
although the differences are not so evident. These varieties and 
their seed numbers are as follows: C. I. No. 620 (S. N. 148), 
Green Russian (S. N. 203, S. N. 314), Monarch (S. N. 161), Silver- 
mine (S. N. 303), and Tobolsk (S. N. 122). 
Although the Avena sativa group as a whole consists of varieties 
susceptible to both smuts, it is important to note the occurrence of 
a few varieties remarkably free from smut infection. Black Mesdag 
Eossesses a very high degree of resistance, while Siberian (S. N. 323) 
as as good a record but has not been grown so long. 
RESULTS FROM AVENA SATIVA ORIENTALIS 
The tests included 24 distinct varieties of side oats (Avena sativa 
orientcdis L.). Practically all of these have shown high percentages 
of infection. Infections of 40 per cent or more were common. 
The var. obtusata (S. N. 33) and var. tartarica (S. N. 5) were much 
less susceptible than the other varieties. Variety mutica (S. N. 32) 
