The Delta independent., 1911-05-26
Orchard Spraying for Cooling Moth.

Orchard Spraying for Cooling Mo1n'
Every orchardist must use MS
own judgment as to how his spray
ing operations for the control Oh
the codling moth should be carried
on. A few general rules deducted
from experiments and orchard prac-
tice, may help those who are not
fully decided as to just how the
work shall be done for the best re-
suits.
Make the first application as soon
as the blossoms are about nine
tenths off the trees.
Have spraying outfits enough 10
cover the orchard within seven to
ten days, if possible, or before the
earliest blossoms close enough to
prevent getting the spray into the
calyx.
Spray the first time for the
special purpose of filling every bios
som on the tree with the poison
used.
In order to get the spray into the
blossoms it will be best to use both
a tower over the pump and spray
rod not less than eight to twelve
feet long, SO as to throw the liquid
downward into the blossoms.
Large orchard trees will require
from six to twelve gallons of spray
for a thorough treatment at the first
application.
For the first application the spray
should be a medium coarse one, not
in large drops. nor in fog or
mist. The idea is that the spray
4 l.. h Il h tanf
TO carry well into the blossoms.
Test the work frequently by pull
ing down the limbs or climbing into
the trees and determining whether
or not the blossoms are all being
filled with the poison liquid.
If the first treatment is thorough
ly and satisfactorily made the second
application need not be made until
about one month after the first,
which will be just about the date
when the first brood of worms is
Matching and beginning to eat into
the apples.
All sprays after the first should
be very fine and so applied as TO
/ lightly cover the entire surface of
the fruit and foliage with the liquid.
The codling moth is two-brooded
in Colorado. The second brood of
eggs matches about seven to eight
weeks after the first. So, about
seven weeks after the second appli-
cation or eleven weeks after the
blossoms fall, which would be from
the middle OF July to the first week
in August, very thorough applica-
ton of fine spray should again be
I ma do To- ha 0f I,srl
ering the entire surface of fruit and
foliage.
The three applications above men
toned should be sufficient for the
control of this insect in ordinary
years. II there is a good reason
| believe the codling moth will be un-
usually abundant, it might be well
to put in a spray between the first
and second treatments mentioned
above. and about one week to ten
days after the first. If there have
been very many wormy apples just
prior to making the third treat
ment, as described above, this ap-
plication should be followed by
another in about ten days. Under
very favorable conditions two, or
even one application may be suffi-
cient for good results.
Arsenate of lead is probably the
best poison to use, all things con-
sidered. Use not less than two and
one-half pounds nor more than four
pounds to each 100 gallons of water
Do not trust the work to hired
man, or TO some neighbor who has
an outfit and wishes to spray your
4 orchard but be present while the
work is carried on, and so direct as
to make certain that the trees are
thoroughly treated and at the right
time.
c. p. GILLETTE.
Colorado Agricultural College, Fort
Collins.