The development and properties of the photostable pyre–throids are reviewed with reference to the use of permethrin for the protection of wool. An emulsifiable concentrate formulation (of this insecticide) – Perigen * – has been developed for use as an industrial mothproofer. The compound shows excellent fastness on wool and good biological activity against the major textile pests. The influence of dyebath pH, dyeing auxiliaries and duration of boiling in the dyebath on the application of the insecticide, is discussed. The low residue levels in effluent from dyebaths following application of Perigen are unlikely to pose any hazard during disposal. Application rates are given for Perigen as an insect–proofing agent for yarn destined for carpets and other products.
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