718 
Journal of Agricultural Research 
Vol. XXVIII, No. 7 
SUMMARY 
Of 217 varieties of oats grown in the greenhouse and in the field, in 1920, after 
being inoculated with oat stem rust collected at Berkeley, Calif., the following 
were found to be resistant: Richland, Ruakura I 73, Snoma, one lot of Green 
Russian, and all lots of White Tartar (White Russian). Eclipse and two lots 
of Green Russian contained a mixture of resistant and susceptible plants. 
Collections of oat stem rust were made from nine oat-growing districts in 
California in 1920 and about 40 varieties of oats, including all previously found 
to be resistant, were inoculated in the greenhouse with these rusts in 1920 and 
again in 1921. In general, the resistant varieties proved resistant to the rust 
from all of these sources, and the susceptible varieties were susceptible to all. 
A possible exception to this rule is the reaction of White Tartar (White 
Russian) to the rust from Eureka. In each of four lots of White Tartar there 
were one or two plants susceptible to the rust from Eureka. The same lots of 
White Tartar were uniformly resistant to the rusts from other parts of the State. 
LITERATURE CITED 
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1920. COMPARATIVE RESISTANCE OP VARIETIES OP OATS TO CROWN AND 
stem rusts. Iowa Agr. Exp. Sta. Research Bui. 62, 56 p., illus. 
(2 ) Eriksson, J., and Henning, E. 
1896. die getreideroste . . . 463 p., illus. Stockholm. 
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1916. A CLASSIFICATION OP THE VARIETIES OP CULTIVATED OATS. N. Y. 
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1921. A PRELIMINARY NOTE ON THE INHERITANCE OP RUST RESISTANCE IN 
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(5) - 
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(6) Griffee, F. 
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190, illus. 
(7) Hoerner, G. R. 
& 1919. biologic forms of puccinia coronata on oats. Phytopathology 
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(8) ^Levine, M. N., and Stakman, E. C. 
1918. A THIRD BIOLOGIC FORM OF PUCCINIA GRAMINIS ON WHEAT. Jour. 
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(9) - 
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