The Hood River glacier. (Hood River, Or.) 1889-1933, 1916-03-09
GILBERT & DEWITT
OFFER SUGGESTIONS

For the information of fruit growers
Gilbert & Dewitt have secured from
s. W. Foster, entomologist of the Gen |
eral Chemical Co., the following:
Spraying suggestions for use in the
Hood River valley to kill leaf roller, |
aphis eggs, San Jose scale, blister
mite, etc., and for the control of fun
gus scab. mildew and codling moth on
apple trees
] Late dormant spray, to kill leaf
roller eggs aud aphis eggs. Dormant
Soluble Oil or Miscible Oil No. dilut-
ed and mixed with water at the rate of
IL gallons for each 200 gallon tank of
spray. Thoroughly cover every part Of
every tree, especially the terminal
buds, fruit spurs and smaller limbs.
Hold the nozzles close to the limbs and
buds and use machines giving high
pressure so that the spray will be
driven against the surface of the tree
with the greatest force. Use large
chamber type mist nozzles with small
opening to produce mist" or "cov
ering' spray.
2 Early Pink Spray, for scab con-
ttois ooC uckfCC bCduIuC kEO BCI
cent sulphur in solution) lime and sui
phur solution mixed with water at the
rate of 8 gallons for each 200 gallon
tank of spray, covering the entire sur
face of the tree. leaf buds and expand
ing fruit buds thoroughly.
3 Calyx Spray, for scab, mildew
and codling moth control. Use the
following combination:
Lime-suplhur solution A gallons
Atomic sulphur IL pounds
Arsenate lead paste 8 pounds
Water to make 200 gallons.
In mixing this combination put the
lime and sulphur solution into the tank
first and then with the agitator run
ning, fill the tank about one-half full of
water, then put in IL pounds of Atomic
sulphur which has been previously di-
luted in two or three times its volume
of water and when the tank is nearly
filed, add the arsenate of lead paste
the last thing before spraying. 1t is
important that the Atomic sulphur be
added at this time in all orchards in.
fected with mildew or where mildew is
likely to cause any trouble. (All fruit
growers who expect to use Atomic sui
phur at any time during the season
should begin al time of calyx spray and
combine it with arsenate of lead and
lime sulphur solution in order to start
stimulation at this time and prevent
over stimulation and sulphur injury
later in the seasun.)
a Ten Day Spray. About 10 days
after the petals fall an additional ap-
plication for scab control should be ap.
piled. Weather conditions will govern,
to some extent, the material to be used.
If cool, rainy weather prevails at this
time, use lime-sulphur solution diluted
at the rate of gallons for each 200
gallon tank of spray. If the weather
is reasonably clear and warm, use
Atomic sui phur at the rate of "a pounds
for each 200 gallon tank of spray, as
this material is less likely to injure the
fruit and foliage than lime-sulphur So
luton under these conditions.
5 Thirty Day Spray. Use the fol-
lowing combination:
Atomic sulphur "a pounds
Arsenate lead paste pounds
Water to make 200 gallons.
AS this is the second spray for cod
ling moth control, the fourth spray for
scab control and the final spray, under
normal conditions, for mildew control.
(If very hot weather prevails at this
time. use 20 pounds of Atomic sulphur
instead of "a pounds for each 200 gallon
tank).
5a If cool rainy weather prevails
between June 10th and goth make an
additional scab spray using Atomic sui
phur 10 pounds to 100 gallons of water.
6 Third Cooling Moth Spray. This
should usually be applied in early Aug
ust. Use arsenate of lead paste at the
rate of 8 pounds for each 200 gallon
tank of spray. Either Atomic sulphur
20 pounds to 200 gallons of water for
scab control or Bordeaux mixture paste
6s pounds to 100 gallons of water or
Bordeaux home made 4-4-50, may be
combined with the arsenate Of lead at
this time as further protection against
scab and anthracnose development.
Properly balanced Bordeaux mixture is
safe to use on most varieties of apples
at this time and in all orchards where
anthracnose is likely to appear, Bor-
deaux mixture should be used at this
time in addition to the early fall appli-
cation recommended for the control Of
this disease.
Thoroughness Essential for Success.
Too much emphasis cannot be put on
the necessity for thoroughness and
proper timing of this work in every de-
tail. Fruit growers know by this time
what to expect by attempting economy
in omitting one or more of these sprays
or by delaying the application of same.
While the sprayings recommended above
will cost something. the amount is in
significant compared with the differ
ence in the price of scabby and of clean
fruit. Furthermore, it must be rea
lied that every year will make it more
difficult to sell infected fruit at any
price. In fact, this will be very largely
prohibited the coming year. Another
point which cannot be too strongly en-
phasized is that scab grows and devel-
ops much faster during colt damp or
wet seasons than it does in hot dry
weather. Furthermore, if rainfall is
more or less general during the spring
months, April and May. the spraying
must be even more carefully done and
repeated more frequently. All spray
ing followed by rain within "a hours,
should be repeated just as soon as pos
sible. Furthermore, the spray cannot
be expected to adhere or stick and give
its greatest efficiency if put on wet
trees.
General Chemical Co.,
San Francisco Office,
Is. w. Foster, Entomologst and Mana