Feb. io, 1923 
Genetics of Bunt Resistance in Wheat 
461 
the differences in bunt resistance would be attributable directly to 
differences in the constitutional make-up of the wheats compared. 
parent stock 
Of the eight varieties to be discussed in relation to their bunt resistance, 
six are of wide commercial importance. Hybrid 128, Turkey, Fortyfold, 
Red Russian, and Jones Winter Fife are the five most important winter 
wheats in the State of Washington and are named in the order of their 
importance from the standpoint of total production. They represent 
more than three-fourths of the winter wheat produced in the Northwest. 
Alaska is not commercially grown except in isolated sections where an 
occasional farmer has been the victim of propagandists who have made 
extravagant claims for it as a wonderfully productive and hardy wheat. 
Of the two spring varieties, Marquis is third in production in Washington 
and is universally grown in the Great Plains area of the United States 
and in northwestern Canada. Florence is of some importance in Aus¬ 
tralia but has not been grown in America except for experimental purposes. 
Taxonomically all are Triticum vulgare except Hybrid 128, which 
belongs to T . compactum and Alaska which is a poulard, T. turgidum. 
Turkey, Florence, and Alaska are resistant (PI. 2, B) and Hybrid 128 
and Jones Winter Fife are susceptible to bunt under all conditions. 
Fortyfold and Red Russian are intermediate but approaching the 
susceptible varieties (PI. 3, A). Marquis is resistant when sown in the 
spring but intermediate or susceptible when fall-sown. Table III gives 
the amount of bunt produced in the tests from 1915 to 1920. The 
season of 1917 was very unfavorable, and the wheat did not come up till 
spring. Since none of the varieties produced any appreciable amount 
of bunt, the record of that year is omitted. 
TABLE III.— Annual percentage of bunt produced on parent stock for the years 191 5 
to 1920 , with the 3-year average for 1918 to 1920 , and the total number of plants in the 
tests during the latter period 
Variety. 
1915 
Percentage of bunt. 
1916 
19x8 
1919 
1920 
Average 
1918-1920. 
Total 
number 
of plants 
in 3 years 
19x8-1920. 
Turkey. 
Marquis 0 . 
Florence. 
Alaska. 
Red Russian. 
Fortyfold. 
Hybrid 128. 
Jones Winter Fife.... 
Average first 4 varie¬ 
ties .. 
Average last 4 varie¬ 
ties .. 
Average of both resist¬ 
ant and suscepti- 
ble&... 
4-6 
67.8 
73 - 5 
86.6 
» 9 -3 
79-3 
i -7 
85.6 
71. 2 
96.4 
87.4 
85. 2 
c. 6 
2.4 
3-4 
7-3 
•9 
8. 1 
. 0 
7 - 1 
49.9 
77*4 
49.6 
76.4 
63.0 
98. 1 
78.3 
94.2 
1. 2 
6. 2 
60. 2 
86.5 
30 - 7 
• 46.4 
7.6 
3 - 5 
12. 2 
20.1 
56.1 
65. 2 
77.6 
73-6 
10. 8 
68. 1 
39-5 
3 - 5 
4.7 
7 - 1 
9.1 
61.1 
63-7 
79.6 
82. o 
2,883 
8x3 
880 
312 
2, 118 
479 
685 
3 U 
4.5 
75 - 9 
38.9 
a Marquis was spring-sown. All the others were sown in the fall throughout the tests. 
& See Plates 2, B, and 3, A, for the type of heads of these eight parent varieties. 
25622—23 -6 
