248 
Journal of Agricultural Research 
VoL XXV. No. s 
RESISTANCE OF RYE VARIETIES TO LEAF RUST 
Further investigations concerning the susceptibility of rye to leaf 
rust were carried on in the autumn of 1921 to determine the suscep¬ 
tibility of a number of the principal rye varieties. Fifty-nine selections 
grown at Arlington Experiment Farm, near Washington, D. C., were 
obtained. All of these had been grown for two or more years in adja¬ 
cent rows and, consequently, some crossing probably had taken place. 
That there still existed considerable individuality in them, however, was 
shown by the variations in yield observed in the 1921 harvest. Six 
varieties of winter rye and three of spring rye were obtained from Mr. 
R. R. Mulvey of the Soils and Crops Department, Purdue University 
Agricultural Experiment Station. Of these, the Rosen and Wisconsin 
No 2 varieties had just been obtained from the Michigan and Wisconsin 
agricultural experiment stations, respectively, where precautions are 
taken to maintain their purity. The other varieties had been grown in 
close proximity for several years and doubtless had crossed. Additional 
pedigreed seed of Rosen rye was obtained from Prof. J. F. Cox, of Mich¬ 
igan Agricultural College, where this variety is maintained in a pure 
condition. Seed of Abruzzes rye was obtained from Prof. G. M. Garren, 
of the North Carolina Agricultural Experiment Station, where it is the 
leading variety and, therefore, probably quite pure. 
Table II .—Data on resistance of 70 varieties and selections of rye to leaf rust , Puccinia 
dispersa , at La Fayette, Ind., in 1922 
Variety. 
Abruzzes. 
Do. 
Do.. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Common Spring 
Giant Winter... 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
C. X. No.° 
40- I 
40- 2 
40- 3 
40- 4 
40- 5 
40- 6 
40- 7 
40— 8 
6 40-47 
6 40-48 
& 40-49 
& 40-56 
& 40-57 
b 40-59 
& 40-61 
3 °~ 9 
30-11 
30-12 
3°~ I 3 
30- 1 4 
3 <>~i 5 
30-16 
30-17 
Source. 
Number 
of plants 
inocu¬ 
lated. 
Resistant plants. 
N. C. Agr. Exp. Sta. 
81 
Number. 
7 
Per cent. 
8.6 
Ind. Agr. Exp. Sta. 
38 
3 
7*9 
Cereal Inv. 
92 
4 
4-3 
72 
5 
6.9 
84 
5 
5*9 
83 
5 
6. 0 
80 
3 
3 - 7 
.do.. 
72 
3 
4.2 
88 
5 
5 - 7 
63 
1 
1. 6 
87 
4 
4-6 
7 i 
7 
9.9 
.do. 
73 
3 
4. 1 
.do. 
35 
7 
20. 0 
.do. 
29 
3 
10.3 
29 
6 
20. 7 
48 
7 
14. 6 
63 
4 
6-3 
Ind. Agr. Exp. Sta. 
*34 
9 
6. 7 
Cereal Inv. 
57 
1 
1.8 
.do. 
61 
2 
3 * 3 
57 
1 
1.8 
.do. 
9 1 
1 
1. 1 
59 
2 
3-4 
56 
3 
5-4 
38 
1 
2. 6 
48 
1 
2. 1 
• Numbers preceding dash are Office of Cereal Investigations accession numbers; those following dash 
are row number in the Arlington Experiment Farm nursery at Washington, D. C., in 1931, and represent 
selections (made in 1918) or strains, in most cases. 
* Selection made previous to 1918. 
