The circle banner. [volume] (Circle, Mont.) 1914-1939, 1924-04-11

the presence of certain diseases, and
planting conditions in the test plots
are such as to bring out what might
otherwise be obscured. This seed
sample must be sent to Bozeman not
later than May Is.
Potato fields which are to be GER
titled must not be next to or near
other potato fields. Any other po-
tato field must be at least 200 feet
from the certified field. 1t is also
recommended that the ground used
for the certified field shall not have
been planted to potatoes for several
seasons preceding. Ground on which
alfalfa or clover has been grown is
recommended.
In order that the potato improve
ment work may take place most ra-
pidly growers are urged to have a
special seed plot, planted, if possible,
according to the tuber-unit plan,
which will be given extra attention
with respect to rogueing. The pur-
pose of this seed plot is to furnish
seed for the main certified seed field
for the coming year.
Before potatoes are planted, al.
seed must be treated with a solution
of corrosive sublimate (merchuric
bichloride) to prevent scab and rhi-
zoctonia. The solution is made by
dissolving four ounces of corrosive
sublimate in a little hot water in a
50-gallon barrel. After the material
is thoroughly dissolved, enough water
Is added to bring the quantity up to
80 gallons. Potatoes are placed in
this solution for one hour either
loosely or in sacks. Since the solu-
ton is gradually weakened, one
fourth to two-fifths of an ounce of
dissolved corrosive sublimate should
be added after every six bushels |
treated and the volume should be
kept at 80 gallons. After SO bu- |
shells have been treated an entirely |
new solution should be prepared. If |
potatoes are very dirty they should |
either be cleaned before treating or
renewed more frequently.
In the corrosive sublimate treat
ment the potatoes should be treated
whole. The caution is given that
corrosive sublimate is deadly poison
f taken internally and treated tubers
should not be used for any food pur-
poses. However, the material is not
INJURIOUS to the skin. Only wooden
'r earthenware containers should be
lsed as it corrodes metals. Treated
potatoes should be placed in clean
acks, as dirty sacks may re-infect |,
he potatoes.
For certification, at least two field
Inspections will be made by inspect
rs of the Montana Potato Improve
nent Association, and third will be
made in most sections. Where only ;
wo field inspections are made the
irst inspection must show not more !
han two per cent of variety mix
ures in the field, not more than five ;
er cent of the plants must be in ,
ected with the following diseases:
Mosaic, spindle tuber, curly dwarf.
eafroll, giant hills or streak; two per 7
ent blackleg, three per cent wilt !
isease, five per cent rhizoctonia and !
i've per cent weak plants. Where :
hree inspections are made the above
pplies to the first two inspections.
When the last field inspection is {
lade there must not be over one-half
er cent of variety mixtures; not {
lore than five per cent of mosaic, {
p1ndle tuber, curly dwarf, giant c
ills, leafroll and streak, and not f
lore than two per cent of wilt, one /
alf of one per cent of black1eg or
i've per cent of rhizoctonia c
The presence of potato wart, po- q
alto eelworm or tuber worm is suf- i
Lcient to disqualify the field. 7
In addition to field inspections, {
IN or shipping point inspections will
Q made where possible. Such in c
pections will be handled generally S
y the field inspectors of the associa- e
ion, shipping point inspectors or
ounty agents. Where potatoes are
ding out of the state, shipping point t
lspections will generally be made a
o pass shipping point inspections, S
otatoes must meet all the require p
tents of U. S. No. 1 standard grade
18th the following exceptions: Pota- d
pes may range in size from two to
z ounces, unless specifically agreed t;