12 The Colorado Experiment Station 
A very satisfactory stand was secured with all varieties except 
No. 12,846 and No. 9,322. When the plants were one year old, they 
were examined very carefully for the presence of the disease with 
the result that all varieties but one, P. L. H. 3,251, were affected 
to a greater or less degree. While not all of the plants in each va¬ 
riety were suffering, some from each, with the exception of the one 
mentioned above, were diseased. Table No. 6, below, gives the 
results of these observations which were made June 20, 1908. 
TABLE NO. 6 
Showing Condition of the Different Varieties of Alfalfa When One Year Old. 
June 20, 1908. 
Variety 
Stand 
Vigor 
Prevalene e 
of Disease 
Size of Plants 
9451 
Fair 
Fair 
Present 
Medium and small 
11275 
Good 
Good 
Present 
Variable 
12398 
Fair 
Fair 
44 
Variable 
12409 
Good 
Good 
44 
Large 
12671 
Fair 
Good 
44 
Variable 
12702 
4 4 
Fair 
44 
Variable 
12747 
4 4 
Good 
44 
Large 
12748 
4 4 
Very good 
44 
Large 
12801 
4 4 
Fair 
4 . 
Small 
12816 
4 4 
Good 
44 
Variable 
12820 
4 4 
Good 
44 
Variable 
12846 
Very poor 
Very poor 
44 
Almost no plants 
13291 
Poor 
Fair 
44 
Large 
13259 
Fair 
Fair 
44 
Small 
13857 
Poor 
Good 
44 
Large, varieties mixed 
17698 
Very good 
Good 
44 
Low and large 
18751 
Good 
Good 
44 
Variable 
19508 
4 4 
Fair 
(< 
Small 
P. L. H. 3251 
4 4 
Very good 
Absent 
Large 
P. L. H. 3252 
Fair 
Fair 
Present 
Small 
12694 
4 4 
Poor 
44 
Frost bitten, varieties mixed 
9453 
4 4 
Fair 
44 
Large spreading 
13437 
Poor 
4 4 
44 
Small 
12784 
Fair 
4 4 
44 
Variable 
9322 
No plants 
Gypsum 1 
Very good 
Very good 
Present 
Small 
Similar observations, made June 11, 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 blight 
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 
