26 
BULLETIN 1239, U. S. DEPARTMENT OF AGRICULTURE. 
and earliness might be expected, but this is not always the case. An 
example of this is to be seen in Early Wilbur, which will produce the 
highest percentage of bunt under test conditions of any variety 
known to the writers. Hybrid 143, which may be used either as a 
winter or spring wheat, has shown in repeated parallel tests that it is 
less liable to bunt than Early Wilbur. Yet the latter matures several 
days ahead of Hybrid 143, and when sown in alternate rows 12 inches 
apart Early Wilbur will frequently grow so much more rapidly in its 
early stages that Hybrid 143 will be almost smothered out. 
Another fact that seems to support the theory of factors that mili- 
tate against the distribution of the fungus within the host, inde- 
pendent of rapidity of growth, is to be seen in the comparatively large 
numbers of partly bunted heads. Whether these factors are chem- 
ical, physical, or morphologic is unknown. The fact that the partly 
bunted heads in Turkey and most other varieties are bunted on one 
side seems to suggest that there is something in the structure of the 
culm that partially prevents the mycelium from crossing from one 
side to the other. Whatever these characters may be, there is little 
doubt that they are quantitatively transmissible in crosses. The 
results obtained by Gaines (9) from studies carried on contempo- 
raneously with those herein reported appear to establish this fact. 
Table 22. — Results of experiments to determine the relative vegetative vigor of four 
varieties of wheat conducted at Pullman, Wash., in 1915. 
Time from 
Experiment No. 1. 
Experiment No. 2. 
sowing. 
Turkey. 
Jones Winter Fife. 
Turkey. 
Jones Winter Fife. 
6 days 
7 davs 
No emergence 
6 first leaves \ to 1 
inch long. 
7 first leaves 1 to 1£ 
inches long. 
7 first leaves 2 to 4 
inches long; second 
leaves not in sight. 
Second leaves 2 to 2£ 
inches Ion?. 
Third leaves to 1 
inch long. 
5 plants; 3 first 
leaves. 
6 first leaves 1 to 2 
inches long. 
6 first leaves 2$ to 3* 
inches long. 
12 plan'-: 6 with 
second leaves in 
sigh! . 
Second leaves 5 
inches long. 
Third leaves J to 1£ 
inches long. 
No emergence 
3 first leaves i to ^ 
inch long. 
6 first leaves h to 2 
inches lone;. " 
11 plants; 3 second 
leaves \ to 1 inch 
long. 
Second leaves 2\ to 4 
inches long. 
Third leaves \ to 1 
inch long. 
Emerging; 3 first 
leaves }to3. 4 inches 
long. 
3 first leaves 1 to 2 
8 days 
9 days 
12 days 
15 days 
inches long. 
2 second leaves in 
sight. 
10 plants; 3 second 
leaves $ to 1 inch 
long. 
Second leaf 1 to 2 
inches long. 
Third leaves 1 to 2 
inches long. 
Time from 
sowing. 
Florence. 
Chul X Bluestem. 
Florence. 
Chul X Bluestem. 
5 davs 
6 plants emerged: no 
leaves. 
9 plants with first 
leaf \ to 2 inches 
in length. 
9 plants with first 
leaves 2J to 4 
inches long. 
6 -("•oiid leaves in 
Second leaves 2 to 4 
inches Long. 
Third leaves in 3ight. 
2 plants emerged; no 
leaves. 
8plants;6firs1 leaves 
emerging from 
coleoptile. 
10 plants: first Leaves 
2 to 3 inches Long. 
ond Leaves in 
sight. 
Second Leaves 2\ to 4 
inches Long 
Second leaves full 
grown, third Leaves 
not in sight. 
No emergence 
2 plants. 1 first Leal 
in sight . 
8 plants; first Leaves 
i to 1 inch long. 
2 second Leaves in 
ighl 
second Leaves l to 4 
inches Long. 
Third Leaves to 1 
Inch in Length. 
6 plants emerged: no 
leaver. 
9 plants; first leaves 
6 days 
7 daY- 
i to 1J inches long. 
i> plants; first leaves 
l to 2 inches Long. 
3 second leaves in 

10 days... 
sight. 
Second leaves 2 to 3 
13 days 
inches Long. 
Third leves 1 to U 
Inches long. 
Concerning varietal differences in susceptibility to actual infection 
such differences are not definitely established. The writers agree with 
