The Beaver herald. [volume] (Beaver, O.T. [Okla.]) 1895-1923, 1907-05-23

the vines of one variety and a differ
ent variety in an adjoining row may
be practically free from the disease at
the same date. In other words, some
varieties are more resistant to the
early blight than others. While our
observation has not extended over so
long period in the case of the late
ss with the early blight, it seems quite
certain that there Is not nearly so
much difference in the susceptibility
pr resistance of varieties to the late
blight as there Is to the early blight.
Spraying is more effective in keeping
the late blight in check than the early
blight
One of the most serious results of
the late blight is the decay of the
tubers following an attack of this dis
ease. This may occur before the po-
tatoes are dug or after they have been
stored The early blight is not asso-
ciated with rotting of the potatoes.
| There is not only difference be-
| tween varieties as to the susceptibility
| or resistance to the early blight, but
| there is also a difference between hills
| of the same variety. This is more no.
| ticeable with some varieties than with
| others. In 1903 several hills of each
| of the following varieties were select
ed and saved for seed by the Ohio
| experiment station because of the ap-
parent tendency of these hills to resist
| disease: Uncle Sam, w. w. Nam
moth, Sir William, Livingston, Pats
| Choice and Quick Crop. The follow
| ing season, 1904 about 35 hills Of
each of these varieties, with the ex-
ception of w. w. Mammoth, of which
there were about 100 hills, were plant.
ed with the seed which had been Sc
lected for blight resistance and an
equal number of hills of the same va.
rieties were planted with seed which
had not been selected AS most OF
the latter were planted from one to
six rods from the former, being in
their regular place in the variety test
1t would not be fair to make com
parison of the yields, although in most
cases it was in favor of the selected
seed. 1t is perfectly safe, however
to point out the difference in the be
havior of the vines when attacked by
the early blight.
Without exception the vines from
the seed which had been taken will
no reference to the blight, began t
break down with an attack of the dis
ease much earlier than the vines O
same variety which had been selecte,
for blight resistance. BY the nintl
OF September the difference was yer.
marked and ten days later the vines
from the seed which was not selected
were nearly dead, while those from
the selected seed were quite green.
The seed from the selected strain
was saved and planted in 1905. Ow
ing 10 lack of space only one variet,
was .planted in considerable quantity
Two rows of w. w. Mammoth, eacl
seed which was selected from resist
ant hills. One row of this variety an
of the same length was planted wit
seed which had not been SO selected
| the latter being planted between tn
other two rows. These rows wer
treated as nearly alike as possible dul
ing the entire season. The vines wer
sprayed five times. The yield of III
non-resistant row was: Marketabl
tubers, 96 pounds; small tubers. 2
pounds; total. 121 pounds. The ave
age yield of the resistant rows was
Marketable tubers. l34 pounds; sma
tubers. IL pounds; total, l51 pounds
= gain in marketable potatoes of 4
per cent and total gain of rs ps