DDT Penetration Prevented by Adding Aluminum Stearate to DDT-Kerosene Solutions

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Abstract
Aluminum stearate dissolved in kerosene at 0.1 g. to 2 g. to 100 ml. results in a gelatinization of the kerosene and greatly retards its rate of penetration into the leaves, fruit, and branches of citrus trees. When 2 g. per 100 ml. of aluminum stearate were added to a 4 wt. % DDT-kerosene soln. and this soln. was applied to the under sides of orange leaves and to orange branches, approx. 4 times as much DDT per unit area remained on the surfaces of the leaves and approx. 3 times as much DDT remained on the surfaces of the branches than when the same amt. of DDT-kerosene soln. without the aluminum stearate was applied. The solns. were applied by means of a camel''s hair brush. The surface deposit of DDT is similarly increased if the solns. are applied to trees as emulsions and with power sprayers.

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