The Wahpeton times. [volume] (Wahpeton, Richland County, Dakota [N.D.]) 1879-1919, 1907-03-28

the center ID the Livingston. PhOtoEra
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 arc more resistant to the
carly blight than others. While our
observation has not extended over so
long a period in the case of the late
as with the early blight. it seems quite
certain that there is not nearly SO
much difference in the susceptibility
or 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 all 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 difference between hills
Of the same variety. This is more no
ticeable with some varieties than with
others. In 1908 several hills of each
ed and saved for seed by the Ohio
experiment station because of the ar,.
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 81 hills of
each OF these varieties, with the en-
ception of W. w. Mammoth. of which
there were about 100 hills. We're plant
ed with the seed which had been Sc
lected for blight resistance and an
equal number of hills of the same va
rieties We're planted with seed which
had not been selected. As most of
the latter We're planted from one to
six rods from the former. being in
their regular place in the variety test.
it 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 with
no reference to the blight. began to
break down with an attack of the dis
ease much earlier than the vines of
same variety which had been selected
for blight resistance. by the ninth
| of September the difference was very
marked and ten days later the vines
from the seed which was not selected
We're nearly dead, while those from
the selected seed were quite green.
The seed from the selected strains
was saved and planted in 1905. Ow-
ing to lack OF space only one variety
was planted in considerable quantity
Two rows of W. W. Mammoth, each
eight rods long. We're planted with
seed which was selected from resist,
ant hills. One row OF this variety and
of the same length was planted with
seed which had not been SO selected
the latter being planted between the
ether two rows. These rows were
treated as nearly alike as. possible dur
ing the entire season. The vines were
sprayed five times. The yield of the
non-resistant row was: Marketable
tubers. sc pounds; small tubers, q
pounds; total, 121 pounds. The aver
age yield of the resistant rows was
Marketable tubers, 1874 pounds; small
tubers, II pounds; total. ISL pounds
gain in marketable potatoes of A
per cent. and total gain Of IS pc