Preliminary Experiments on the use of Chlorpicrin as an Insect Fumigant in Flour and Cereal Mills1

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Abstract
Chlorpicrin, the “tear gas” of war days, has been very successfully used to combat common insects found in flour and cereal mills. The liquid chlorpicrin, diluted with an equal quantity by volume of carbon tetrachloride, is best applied within the milling equipment by vaporizing the fumigant in the elevator heads while the mill is running. It is this use of the fumigant within the machines and elevator legs without fire hazard and without serious personal danger that constitutes its greatest advantage. Small amounts of it can be used to destroy infestations in conveyors, bins, or pieces of idle equipment without interfering with the normal operation of the mill. The preliminary experiments indicate plainly that frequent fumigations with chlorpicrin will keep mill infesting insects down to minimum numbers and greatly increase the intervals at which general fumigations are necessary.

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