30 The Colorado Experiment Station 
Similar observations, made June n, 1909, when the plants were 
two years old, showed that all varieties were affected, including 
P. L. H. No. 3,251, which had promised immunity the previous 
season. At this time of the year, the alfalfa was from ten to twenty 
inches high; the majority of it had a good color, and while the bliglrc 
was present in all varieties, it was not abundant enough to do any 
serious damage to the crop. Only a few stems of each plant were 
suffering and only the lower internodes of these. Such stems had 
the characteristic watery, yellow green color, very little blackening 
having occurred up to this time. Occasionally plants were found on 
which the attack had been so acute that they were entirely destroyed. 
Their location was marked only by patches of dwarfed, shriveled 
stems, now dried and prostrate. Four of the twenty-six varieties 
were noticibly freer from the infection than the rest, namely, No. 
12,398, No. 12,671, No. 12,784, and P. L. H. 3,251. It is a matter 
of considerable practical interest, that the first three of these are 
from seed which we may consider as home grown; the first is from 
Colorado, the second, Kansas; the third, Utah. If we are so 
fortunate as to find high resistance in plants from local seed, the 
question of obtaining resistant varieties will be much more easily 
solved than if we are compelled to breed up a strain from foreign 
seed. Table No. 7 gives the detailed observations on the variety 
plats, made June 11, 1909. 
table no. 7 
.Showing Condition of the Different Varieties of Alfalfa when Two Years Old. 
June 11, 1909. 
Variety 
Vigor 
Prevalence of the Disease 
9451. 
Fair 
Present 
11275. 
Fair 
Present 
12398. 
Good 
Present, but not serious 
12409. 
Fair 
Present 
12671. 
Good 
Present, but not serious 
12702 . 
Good 
Present 
12747. 
Good 
Present 
12748. 
Fair 
Present 
12784 . 
Good 
Present, but not serious 
12801. 
Poor 
Present 
12816. 
Fair 
Present 
12820. 
Good 
Present 
12846. 
No plants 
No plants 
13291 . 
Fair 
44 44 
13259. 
Fair 
44 44 
13857. 
Poor 
44 44 
17698. 
Good 
44 (4 
18751. 
Fair 
44 44 
19508 . 
Good 
44 4 4 
3251. 
Very good 
Present, but not serious 
3252. 
Fair 
Present 
9322. 
No plants 
No plants 
12694. 
Very good 
Present, but not serious 
9453. 
Poor 
Present 
13437. 
Fair 
Present, but not serious 
GvpsumNo.1 'Good 
Present, but not serious 
