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FCREST ENTOMOLOGY 3

Materials and Amounts for Stock Mixture. fy

UNITED STATES DEPARTMENT OF AGRICULTURE.
BUREAU OF ENTOMOLOGY,
WASHINGTON, 2, C.

March 3, 1916.

Brief Information on
KEROSEHNEOEMUL § F ON
Its Preparation and Use.

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Preparation.
(1) Dissolve the soap in boiling water.
(2) Remove the solution from fire, promptly add the kerosene and

Note.

Dilution.

thoroughly agitate the mixture for about 5 minutes until
it becomes creamy - an emulsion. Where a pump is used the
agitation is most effectively done by pumping the mixture
through the nozzle back into the original container for
several minutes. ,

To avoid boiling, a naphtha soap may be used, but the
quantity of soap must be doubled and the water must be
soft (rain water).

To each two gallons of water add emulsion:

fn Fall and Winter - 1 gallon.
In Summer - 1/3 gallon.

Application.
Aim to cover every insect.
Use any spraying device at hand: a tin atomizer is not too crude

for small plants and power sprayers with fine nozzles are
a necessity for extensive operations. Potash soaps and
warm solutions, well strained, prevent clogging of nozzles.

For Spraying Trees Against Borers.
There is some evidence that the addition of sodium arsenate to

the solution, applied at the proper time, kills young
borers in the bark. It may, therefore, be well to try

it on a limited scale. Hence, in connection with the
above, dissolve one pound of sodium arsenate in the 2
gallons of water for the winter solution, and 10 ounces -
for the summer solution.

A, D. HOPKINS,
Forest Entomologist.

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