VARIETAL SUSCEPTIBILITY OF OATS TO SMUTS 
31 
In the series inoculated with U. levis, a total of 1,893 plants was grown 
at Brooklyn, but none was infected. The infect eel plants were all 
found in 1921, and there can be no doubt as to their identity. The 
variety, however, has proved consistently to be highly resistant. 
A second group includes those strains and varieties which had a 
low percentage of infection, varying from less than 5 to about 20. 
Occasionally negative results were obtained, and in a few cases the 
percentage of infection at a particular station in one season exceeded 
20. The varieties included in this list are shown in Table 4. 
Table 4. — List of varieties and strains of Avena sativa found to be moderately 
resistant to both loose and covered smuts of oats 
Variety or strain 
Seed 
No. 
Variety or strain 
Seed 
No. 
35 
7,328 
127 
398 
360 
201 
273 
121 
296 
317 
Iowar .. ---_-_ 
397 
204 
Irish Victor - . .. . . 
C.I. No. 606-.- 
125, 208 
Kherson 
209 
212 
50, 51, 286 
281 
Eichland 
Var. setosa - ... ______ 
14 
Sixty-Day Selection.. 
167 
Hay 
A third group includes those varieties which are moderately sus- 
ceptible to both smuts. The degree of infection usually ranges 
between 20 and 40 per cent, rarely falling below 20 or rising above 40. 
This list is a long one, as shown in Table 5, and includes most of the 
varieties and strains of Avena sativa. 
Table 5. — List of varieties and strains of Avena sativa found to be moderately 
susceptible to both loose and covered smuts of oats 
Variety or strain 
Seed No. 
Variety or strain 
Seed No. 
269 
270 
114 
271 
115,321 
272, 307 
185 
8 
191 
120, 192 
194, 344 
195 
151 
153 
315 
276, 313 
318 
155 
158 
9 
277 
160, 210, 211. 213, 278 
10 
43,44,47,49,53,54,56,58 
60 
Var. nigra 
Banner 
123. 184 
Belvak 
Old Island Black 
163, 217 
63 
Big Four . .- 
266 
Siberian 
282 
Clydesdale... . - . _ 
164, 199, 220, 221, 319 
Silvermine (selection) 
Sixtv-Day .-- 
165 
Culberson (selection) .. 
223. 224 
168, 225-228 
Early Dakota -.. 
Tobolsk . 
232 
283,364 
324 
Golden Fleece ... 
Green Russian _ 
325 
234, 326 
Irish Victor 
Winter Turf 
365 
366 
Lincoln 
A fourth group includes a few varieties which may be described as 
very highly susceptible to both loose and covered smut. As a rule, 
percentages of infection of 40 or higher are obtained. The varieties 
and numbers are given in Table 6. 
