Precor IGR Concentrate is an important element of flea control because it controls the pre-adult fleas that make up 95% of a typical flea population. Precor IGR's molecules penetrate deep into the places pre-adult fleas live, like the base of carpet fibers and between furniture cushions - in short, the sources of a flea infestation. Precor IGR targets fleas in the egg and larval stages of development. As a result, pre-adult fleas cannot develop into adults to produce new infestations of breeding, biting adults. Can be sprayed on carpets, furniture and pet sleeping and bedding areas.