The Delta independent., 1907-12-13
COMBINED INSECTICIDES
FOR PLANT LICE AND
THE CODDLINd MOTH
&c. 2. Gillette.l

On account of the abundance of the
green aphis and the wolly aphis in
many fruit growing sections, it is evil
dent that it would be matter of econ
omy to be able to apply together in
secticides that would destroy both the
plant lice and the codling moth or ap-
pie worm.
Years ago certain entomologists, rec
ognizing the advantage of such spray,
advised the combining of kerosene
emulsion and spray of Paris green or
London purple wherever it was found
necessary to destroy both leaf feeding
insects and plant lice at the same time.
l tried the combination of these insec
ticides until became thoroughly salts
fed that it is not practical to use arsen-
ical poisons with a kerosene emulsion.
The oil in the kerosene emulsion is
broken into extremely minute globules
causing it to be suspended in water,
and every solid body, as the fine parti-
cles of Paris green or London purple,
serves as nucleus about which the
little globules collect and then rise to
separation of the oil from the mixture.
There are combined insecticides, how
ever, that can be used with success and
probably there is none better than a
spray composed of arsenate of lead and
either tobacco decoction or a strong,
soapy mixture.
The orchardists upon the Western
Slope in Colorado have thoroughly dem
onstrated that tobacco preparation
known as Black Leaf Dip, used in water
in the proportion of about one gallon of
the dip to 65 or 10 gollons of water, is
very effectual remedy against the
plant lice of the orchard when thorough
application is made. 1t has also been
thoroughly proven that arsenate of
lead is one of the best, if not the best,
arsenical poisons for the destruction of
| the codling moth. AS the tobacco pre-
| oaration is not an emulsion and as it
loes not combine in any way with the
arsenate of lead or act as an antidote
to this poison, these two insecticides
may be used together. In so doing it
would be necessary to use each poison
strong enough to kill the insects for
which it is applied. By this 1 mean
that the Black Leaf Dip should be in
the proportion of about one gallon to
| 70 gallons of the mixture, and the ar
senate of lead should be in the ropor-
tion of about one pound to twenty gal
Ions of the entire mixture. AS the
of IL
stroy plant lice, neither has the tobacco
preparation any appreiable effect in
destroying the codling moth larvae.
If winter or early spring applications
have been made in the orchard for the
destruction of the plant lice, and if
these applications have been success
full, it will not be necessary to add the
| tobacco preparation at the time of the
| first treatment of the orchard for the
codling mo.h. In fact, it is probable
,at it would not be necessary to make
the combined spray mixture before the
irst of June, or at the first spraying
after the plant lice are noticed to be
present upon the trees. On the other
hand, if the winter or early spring
sprayings have not been attended to,
the combined spray could well be used
at the tim. for the first codling moth
treatment, or when the petals have
mostly fallen from the apple trees.
In case one prefers to use one of the
whale-oil or tree-soaps in place of to-
bacco, they may be employed without |
any deleterious effect upon the arseni-
ical poison, and neither will the arseni- |
cal have any bad effect upon the spray
in it's work of destroying the plant lice.
Most soaps used for the destruction of |
plant lice may be used in the proper
tion of one pound to eight gallons of |
water. Then, in case soap is used |
200-gallon tank should have about ten |
pounds of arsenate of lead and twenty
five pounds of soap for the combined |
spray mixture.
1t will not do to depend upon using a |
combined spray at all times, because it |
will often be necessary to make an ap-
plication for the codlng moth when it |
the lice. And it will also be necessary
occasionally to make application for the
destruction of the lice when it would be |
useless to add the arsenical poison.
The following Eckert items were left
over last week. y
Henry Teachout has returned from
Montrose where he spent a few days
with his daughter.
~