Abstract
A procedure is described for measuring the resistance of textile pests to mothproofing agents. By this method, dieldrin-resistant wild strains of Tinea metonella and Tineola bisselliella are shown to have acquired no resistance or only very little resistance to the commonly used industrial mothproofing agents. T. metonella require much higher concentrations of these mothproofing agents for their control than T. bisselliella. The high dieldrin-resistance in wild strains of T. metonella is substantially reduced in the presence of the insecticide synergist, piperonyl butoxide.

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