The Portland daily press., 1895-05-03
POPULAR INSECTICIDES.
Two Glasses, Those That Poison and Those
THAT Kill by Contact.

Two c,.sses. Those That Poison and Those
THAT Kill by Contact.
Insecticides are of two kinds Or class
es-those which kill by poisoning and
those which kill by contact, killing Ell
ther by irritation or by smothering. The
unpatented remedies of the first class
are: Paris green, arsenite OF copper,
london purple. arserite Of lime and
gvpsine or arsenate Of lead. These are
Sometimes spoken of as the arsenites.
They can be used in dry powder form
or with water. When used in powder
form they should be mixed with flour,
road dust or land plaster at the rate Of
1 part of the poison to Is or 20 parts
of -four or plaster.
FORMULA FOR WATER MIXTURES.
Paris green or london purple..... pound
Lime unslaked. ..................... 10 pounds
Water ito make). )..................... 160 gallons
Slake the lime and add to the paris
green with sufficient water to make 100
gallons. sa5
For cabbage insects it is best to use
the arsenites in water. Milk OF lime
should be made from water Stacked lime.
The limo not only prevents any injury
to the foliage, but also aids IN making
the poison adhere to it,
Gypsene is a remedy used by the gyp-
sy moth commission, but needs to be
tested further before being recommended
for general USE
The principle insecticides of the Sec
ond class are kerosene washes, rosin
wash, bisulphide of carbon, tobacco and
hot water. Kerosene washes are Of two
sorts, and the formulas are usually Civ
en- for stock solutions. These are, first ::
KEROSENE AND SOAP EMULSION
kerosene. ....,............ gallons
soap. .......................... q pound
Water (soft). )........................... gallon
The soap should be dissolved by boil
ing. Remove from the stove and while
hot add the kerosene. Agitate the mix
ture by churning or otherwise until it
has the consistency Of cream. Second:
EMULSION oF KEROSENE AND MILK.
Kerosene. ...........................2 gallons
Sour milk. OBSERVATION-DISCLOSURES l gallon
This simply requires churning with
out heat. The second emulsion will not
keep long. 9f afaa
These stock solutions should be di-
luted with 10 to 20 parts water when
used, depending on the susceptibility of
the foliage to injury from the emulsion
and the kind Of insects to be treated.
The soap emulsion becomes hard by
standing and sl1ould be dissolved in q
little hot water when wanted for use.
Care should always be used not to have
free oil in any Of the eTaulsions
Ros1N WASH.
Rosln.. ......................... 70 pounds
Caustic SODA. ACKNOWLEDGEMENTS. pounds
flsh OIL. .......-..............- ~ plnts
Water Ito make). e)............;........ 100 gallons
The rosin and oaustic soda should be
finely broken up to help in dissolving
them. Put in an iron kettle with the
fish oil and water enough added to COW
er the whole. The boiling should be
continued from one to two hours, or un-
til the compound will mix yith water
without forming yeliowish flakes.
Omitting few special cases, insects
which feed on plants may be divided into
two groups-viz, biting Or gnawing in
sects and sucking or pumping insects
For the first group, or biting insects,
only the first class of remedies are prac-
tical For the second group, Or suctorial
insects, only the second class of insecti-
cides can be used.