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DDT FORMULATIONS 
Chemically pure DDT melts at 108.5°-109°C. Two grades of commercial 
product are available — technical DDT, specified to have a setting point 
not lower than 88° j and DDT, purified, specified to have a melting point 
of at least 103°. The former has found use in louse powders, mosquito 
larvicides, and in general agricultural experimentetion; the latter is 
intended for use in aerosol bombs. DDT has been used in water suspen- 
sions, solutions, emulsions, dusts, and aerosols. Water suspensions are 
divided into three classes (l) those resulting from the mixing of finely- 
ground DDT (ground either dry or wet) with water, (2) those resulting 
from the dilution with water of a solution of DDT in a water-mis cible 
orgpnic solvent, and (3) those obtained by mixing diluents impregnated 
or coated with DDT with water. The preparation of these formulations is 
discussed.— Chisholm (112 ) . 
G-esarol AKZ-40 Spray is a powder containing 40 percent of DDT which 
is easily wettable and stable in water suspension. It has been design- 
ed particularly for use with Gesafloc spreader (a liquid soap spreader 
preparation) in the control of codling moth.— Geigy Co. (167 ) . 
Gesarol AK-40 Spray is a powder containing 40 percent of DDT. It 
is easily wettable and stable in water suspension.— Geigy Co. (168 ) . 
Gesarol A-20 Spray is a finely ground powder containing 20 percent 
of DDT. It is easily wettable and stable in water suspension, and con- 
tains an amount of wetting agent and sticker necessary for the recommend- 
ed uses. Geserol A-20 spray is designed for use on such hard to wet crops 
as onions, corn, and certain ornamentals and shade trees where good wetting 
or penetration of leaf -axils is required.— Geigy Co. (173 ) . 
The composition of some Geigy products tested in California is as 
follows: 
GNB-A is "commercial pure" DDT 
A3 is a 3 percent DDT dust 
A-20 is 20 percent DDT witn wetting agent 
AK-20 is 20 percent DDT without wetting agent 
SH-5 is 5 percent DDT in emulsive oil base 
SH-20 is 20 percent DDT in emulsive oil base 
SHN-20 is 20 percent DDT in nonemulsive oil base 
.—Calif. Agr. Expt. Sta. (101). 
Neocid Spray Deodorized contains 5 peroesit by weight of DDT in a 
deodorized kerosene base. It should be used undiluted as a residual-type 
spray in the control of flies, mosquitoes, bedbugs, fleas, silverfish, 
clothes moths, carpet beetles, ticks infesting buildings, cockroaches, 
poultry mites, and fowl ticks ("bluebugs"). — Geigy Co. ( 172) . 
