All the benefits of an Insect Growth Regulator (IGR) in a discreet, non-spray formulation.Activating Gentrol Point Source® is as simple as squeezing the raised end of the plastic, adhesive-back device. This releases Gentrol IGR onto a filter paper. From there, it moves up to 75 square feet. That way, pests never need to come in contact with the device. Contains the Insect Growth Regulator (S)-Hydroprene for 90-day control of stored product pests. (S)-Hydroprene, the active ingredient, prevents pest larvae from progressing to the adult stage either causing sterility of adults or preventing the emergence of insects from the pupal stage preventing future infestations.