Dec. 17, 1917 
Bacterial-Blight of Barley 
631 
Table I.— Bacterial-blight of barley: Varietal range and susceptibility —Continued 
Variety. 
Highmore, 
S. Dak. 
St. Paul, 
Minn. 
Moccasin, 
Mont. 
Williston, 
N. Dak. 
Madison, 
Wis. 
Akron, 
Colo. 
Hordeum vulgare group—Con. 
Eagle. 
8 
2 
Featherston. 
6 
Gatami. 
5 
Luth. 
4 
2 
2 
Manchurian. 
Minnesota 105. 
4 
2 
Oderbrucker. 
4 
4 
4 
4 
4 
+ 
+ 
Odessa. 
6 
Peru. 
8 
Poda.... 
Red River. 
Summit. 
Williston C. 1 . 882 . 
4 
Wisconsin 5. 
+ 
Wisconsin 14.. 
4 
6 
Hordeum hexastichum group: 
Mariout. 
3 
Williston Selection 17. 
+ 
While, at each of the above-mentioned places, a number of other 
varieties of barley were observed to be free from bacterial blight, a 
possible indication of some degree of resistance, no mention is made of 
these in Table I, since no experimental tests have been made on them 
as yet in this regard. 
These observations indicate that the bacterial blight is widespread in 
its occurrence, and is probably to be found in all barley-growing sections 
of the United States. It seems to be considerably more prevalent and 
destructive in the Dakotas than farther east. It attacks all three groups 
of barley without evident preference. Within a group there is evidently 
a difference in relative susceptibility. For example, in the vulgare group, 
Oderbrucker seems to be less susceptible than Beldi, and in the distichum 
group, Hanna seems somewhat more susceptible than Chevalier. The 
observations here recorded were, however, not sufficiently extended to 
justify any close final comparisons as to such varietal rankings in regard 
to relative disease resistance. 
THE ORGANISM 
ISOLATION AND REINFECTION 
The freshly invaded tissues as well as the exudate are teeming with 
bacteria and, after acquaintance with the specific organism, little diffi¬ 
culty has been experienced in isolating it from either source. As illus¬ 
trating method and results, the following may be cited: A strong- 
succulent, lower leaf was selected showing natural midvein infection 
extending down past the ligule. This lesion was in the earlier stages 
of rapid development and showed the characteristic water-soaked appear- 
