The seasonal storage of dried citrus pulp has created a serious warehouse insect problem because this commodity is very susceptible to insect infestations. The presence of insects not only affects the decomposition of the dried citrus pulp but also makes it undesirable to shippers, warehousemen, and the consumer because of the danger of spreading the infestation to other commodities in the vicinity. Tests showed that it is practical to use monthly applications of wettable powders at the rate of 5 mg. of pyrethrum and 50 mg. of piperonal butoxide per square foot to treat large quantities and that the cost is less if treatment is kept with wettable powders than with aerosols.