The Sun. [volume] (Price, Utah) 1915-1932, 1920-10-01

fit must have relief valve near the
pump, permitting the surplus flow to
return to the tank. The pump must
have an air pressure chamber large
enough to keep the flow steady and
insure oven distribution Of the poison.
Even pressure, indispensable for uni
form spread of the poison, can not be
maintained without a pressure gauge.
This gauge should be attached to the
pressure chamber or near it and ut n
distance from the relief valve and the
nozzles. The boom or pipe which car
ries the MOBILES and supplies them
with liquid from the pump is made Of
two-foot pieces of haif-inch galvan-
lied iron pipe joined by tees, each Of
which affords an opening for the at
tachment Of a nozzle The boom isl
connected with the pump by a half
inch pressure hose. The boom should
be supported by a piece Of timber,
two by four, clamped or hinged to the
truck with the boom stapled, bolted
or wired to it, Plain misty nozzles
without strainers or other complica-
tions should be used
Spray In Warm Weather.
The best time for spraying is at
what the specialists call the turning
TWO WEEVIL ...... zee. .......
point Of weevil infestation-from one
to two weeks before the first crop is
ready for cutting, when the young
larvae become 50 numerous that they
completely destroy the growing tips.
After that point is reached the weev-
lis, If left alone, consume the leaves
until nothing is left but the woody
fibers. If spraying is done at this
time the crop RECEIVERS quickly. Spray
ing yearly in the spring sometimes en-
tirely prevents damage, but IL is un-
certain. On the other hand, plants
sprayed after they were entirely
stripped of their foliage hive been
able TO recover and bloom, but this
allows destruction TO go too far and
makes recovery too slow. Spraying
at the turning point" not only pro.
tccts the first crop, but confers an
even larger benefit on the second
crop, which sprouts and grows with.
out delay and no treatment of the
stubble is necessary. Stubble spray
ing after the cutting Of the first crop
has been successfully done, but II re-
quires getting into the field immedi-
ately after cutting and n much larger
quantity Of liquid is required than IL
It were applied TO the first crop
Stubble spraying, therefore, is adyis-
ed only when earlier spraying has
been impossible. Spraying should be
done, IL possible, at the beginning Of
warm spell. The wceyils do not
feed no voraciously in cool weather
and u the poison is applied at the be-
ginning of a cool spell Il may become
largely impotcnt before the weevils
resume feeding freely. When spray
ing is done under favorable weather
conditions most Of the wccyils are
killed within four or five days.
Some other Methods.
There are other control measures,
but none Of them promises much un.
less applied before or Immediately
after the first cutting. One method
is TO pasture the alfalfa field until
most of the eggs and young larvae
have been destroyed Another is Ia
use the alfalfa as a soiling crop, cut.
ting il green two or three times dur,
ing the season These methods, how,
ever, must be practiced before the
turning point Of infestation, ms after
that time the wceyils destroy th,
plants so completely that there is not
enough growth for either pasture oi
soiling. Another method is 10 cult
waite the field with a harrow or other
implement, Immediately after IN,
first cutting, IN such way as TO cover
the field with n dust mulch, thus eX
posing the entire surface of the fielt
to the sun and killing most of the
weeyils. In some instances tho see
ond crop has been protected by drag
ging the stubble, while IL is still wel
from irrigation, with the land leyelei
or the clodbreaker This causes the
insects to perish by embedding then
m the mud, but il is harmful 10 IA,
a.l auN "a NOT gas.rHtunaUNal