32—STUDIES ON TEXTILE INSECTPROOFING. PART III: ORGANOPHOSPHORUS INSECTICIDES

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Abstract
An investigation is described in which Chlorpyrifos (O,O-diethyl-O-3,5, 6-trichloropyridyl-phosphorothioate) was found to be the most active of eleven organophosphorus insecticides evaluated as mothproofing agents. Its minimum effective concentration on wool was approximately 0.005%(w/w). Bioassay indicated that application of 0.05% of Chlorpyrifos (at 6O–80°C) conferred mothproofness that survived laundering and dry-cleaning. Chemical-residue analysis revealed large losses of this steam-volatile insecticide during fabric treatment, storage, and use that make it unsuitable for permanent mothproofing applications.