White Bluffs spokesman. [volume] (White Bluffs, Wash.) 1907-1938, 1930-04-18
Thoro Spraying
Is Necessary

| Last season the loss to the apple
industry caused by the cooling moth
exceeded by far that caused by any
other insect pest. Some crops were
not packed but were delivered di-
rectly to the Gull car, while in
others the loss ranged from to &c
per cent, mostly due to worm infes-
tation Due to- this heavy worm in
festation, control measures will have
to be very effective if a clean crop
of apples is to be harvested this
fall.
Effective control of any insect
pest by spraying depends on three
things. First, the spray material
NUT be efficient at the strength used;
second, the spray must be applied
at the time when it will have the
most effect in killing the pest; and
third, the spray must be applied
thoroughly.
For the control of codling moth
the spray material that has been
most generally used has been arsen-
ate of lead at strengths varying from
pounds to 10 pounds to each 200
gallons of water. Professor Anthony
Spuler, Entomolpgist of Washing
ton State College, experimenting at
Wenatchee, found in his tests that
8 pounds of lead to 100 gallons of
water was more efficient than
pounds to 100 gallons
Summer oil is being used more
each year in the cooling moth spray
program. Used in combination with
arsenate of lead, it not only de-
stroys many of the cooling moth
eggs that are deposited on the fruit,
but increases the efficiency of the
arsenate of lead over longer time.
Mr.. Spuler states that, "The oil-lead
arsenate combination is more effect
tive after 10 days than lead arsenate
alone is Immediately after spraying.
Not over three sprays containing
oil are recommended. Oil alone as
a control of codling moth has not
| proven successful
The time of application of the
cooling moth sprays varies with the
season.
The calyx spray should be applied
after most Of the petals have fallen
and before the calyx lobes have
closed. Unless exceptionally warm
weather follows the falling of the
petals, to 10 days will elapse be-
fore many of the calyx cups are
closed. This spray is important and
should not be omitted.
The first cover spray is applied
to protect the small fruit from the
newly Matched worms Under favor
able weather conditions, the first
/ L.
after the first codling moth energies.
>Entomolc gists tell us that the cod
ling moth begins laying eggs which
the evening temperature for three
consecutive days is above 90 de-
grees F. Meth ennel gence can be de-
termined by the use of moth traps
Every orchardist should take care
of from 8 to moth traps in his or
chard. These traps should be used
throughout the season and the spray
program for that orchard based or
the mott, trap records. Two orchards
Ionly half mile apart may vary at
the peak of moth emergence from
3 days to a week.
be supplemented by checking the
egg deposit. The first eggs are laid
On the leaves but later they may bs
found on the fruit The egg is
pearly white about the size of pin.
head and resembles a thin convex
disk. A few days after the egg is laie
a red ring becomes apparent and the
day before the worm matches blacl
spot, the head of the worm, is
easily seen BY determining the motl
emergence by the use of traps ane
checking the egg deposit by obser
walton, more efficient spray pro
gram may be outlined, whether ar
senate of leNd alone or oil-lead ARISEN
ate combination is to be used.
Our mailing list of fruit grower.
is incomplete. Any one not receiving
the circular sent out this week may
receive copy by writing for it o,
calling the horticultural Office al
| Droccar Wach;,,o%o,,