IMPROVEMENT OF KUBANKA-DURUM WHEAT.. 3 
PURE-LINE SELECTIONS. 
Kubanka wheat was chosen as a variety from which to make pure- 
line selections because of its adaptation to conditions as evidenced 
by high yields, its value for manufacturing purposes, and its diversity 
of composition. Kubanka consists of a large number of strains or 
types differing somewhat in character and quality. Hach strain or 
type breeds true unless it happens to be a hybrid resulting from a 
field cross. The improvement of Kubanka wheat by the pure-line 
selection method at the Dickinson substation, Dickinson, N. Dak., 
is described in this bulletin. 
In 1906 Prof. L. R. Waldron, then superintendent of the Dickinson 
substation, made several pure-line selections from Kubanka (C. I. 
No. 1440). One of these selections, Kubanka No. 8 (C. I. No. 4063), 
' proved superior in yield to the original Kubanka at Dickinson and 
DURUM WHEAT 
ESTIMATED ACREAGE 
1919 
EACH DOT REPRESENTS 
2,000 ACRES 
DURUM WHEAT 
ESTIMATED ACREAGE, 1919 
sTaTE | acres |] state] ACRES 
N. Dak | 2,707,400 || Wyo . 44,900 
S. Dak | 688,700 || Kans . 43,200 
| Mont .| 281,600 |] Tex .. 40,800 
Nebr i 206,100 || lowa. . 15,400 
Cole Other . 
ale. .| 148,200 
Min -| 137,300 | U.S _. [4,370,800 
Fic. 1.—Map showing the acreage of durum wheat in the United States in 1919. Each 
dot represents 2,000 acres. 
has been quite widely distributed in western North Dakota. Ku- 
banka No. 8, however, has proved to be one of the more rust-suscepti- 
ble strains of the variety. 
With the frequent recurrence of stem-rust damage in North 
_ Dakota, it seemed advisable to make additional selections from the 
_ bulk Kubanka in an effort to obtain strains resistant to stem rust 
which would produce good yields of grain suitable for the manufacture 
of semolina or flour. - 
In 1915 R. W. Smith made 143 head selections? from a plat of 
Kubanka (C. I. No. 1440) at the Dickinson substation. The separate 
strains were grown in 5-foot rows at Dickinson in 1916 and in dupli- 
cated 16-foot rows in each of the following three years, except that 
in 1917 some strains were necessarily grown in single rows because of 
desire to acknowledge 
Stoa, at Fargo, N. Dak.; J. C. Brinsmade, jr., at Mandan, N. Dak.; O. A. Thompson, at Edgeley, N. Dak.; 
