Method for killing dust mites and preventing associated allergies

A method for killing dust mites living in a substrate, said mites selected from the group consisting of Dermatophagoides pteronyssinus, Dermatophagoides farinae, Dermatophagoides microceras, and Euroglyphus maynei, said substrate selected from the group consisting of carpet, rugs, bedding materials, upholstery, and toys made from fabric, said method comprising applying to said dust mites or infested substrate thereof an amount effective for killing dust mites of a mixture comprising between about 0.01% and about 1% of pyrethrin, between about 0.01% and 1% of tetramethrin, and between about 0.05% and about 10% of piperonyl butoxide wherein said concentrations represent weight percentages relative to the weight of the final mixture.