White Bluffs spokesman. [volume] (White Bluffs, Wash.) 1907-1938, 1930-02-14
SPRAY SUGGESTIONS
FOR MOTH CONTROL

Spray recommendations for codlint
moth control in the fruit sections o.
Washington for 1880 were formulated
by representatives of the Washington
State Experiment station, the federal
bureau of entomology and the Wash.
ington State department of agricul-
ture, meeting in Spokane recently.
Cooling moth infestation in Wash
ington varies in intensity in different
districts and in different orchards and
in different portions of the same or
chard," declare the representatives who
formulate the spray recommendations.
The severity of the infestation varies
from year to year and depends on the
temperature at the time of the en-
ergence of the moth, length of growing
season, and degree of infestation the
previous year."
for cooling moth control which has
been conducted for number of years
and on it's application in commercial
orchards, the committee present the
following rules for the guidance Of
fruit growers for 1880.
(a) Spray materials:
l. Arsenate of lead
Arsenate of lead is the most import
ant single insecticide for codling moth
control. One pound to so gallons of
water is usually sufficient. For heavy
infestations, one and one-half pounds
are recommended More than this
should not be used because of conse-
quent difficulties of residue removal.
Q. Oil
The use of summer oil alone has
not given control of the cooling moth.
Oils should be used only in combina-
ton with lead arsenate or nicotine
sulphate. Oils in combination with
lead arsenate should be applied during
the height of the egg-laying period Of
the first brood, but if sulphur sprays
are applied after the dominant period,
no oil should be used in the first
brood sprays. Because of the difficulty
in removing spray residue, the oil
lead arsenate combination should not
be used after July rs.
The number of applications of sum-
mer oils should not exceed three, and
under most conditions not more than
two are advisable. One gallon of en-
ulsion to 100 is sufficient. Oil ranging
in viscocity from 65-75 and with a
sulfonation test of not less than IS
per cent have proven most satisfactory
Cau&ion: Oils in combination with
lead arsenate should not be allowed to
stand in pipes or spray tanks, but
should be applied Immediately after
being mixed. Fruit sprayed with this
combination after the spray has been
allowed to stand in tanks or pipes for
some time can be cleaned only with
great difficulty.
This spray mixture is also inef-
fective in control.
%. Nicotine sulphate rsssc-' r.
Nicotine sulphate alone will not
control the cooling moth but it con-
stitutes very effective substitute for
arsenate of lead in the application of
oil already recommended. The nicotine
oil combination is more effective than
arsenate of lead for the second brood
sprays. Its substitution for arsenate
of lead or the lead-oiL combination
decreases the spray residue problem,
and it may be used after July Is. In
this combination, nicotine -sulphate |
should be used at the rate of ore-half
to three-fourths pints to 100 gallons.
(b) Spray application
/. The time of application and num-
Der of sprays to be used will vary in
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