Gentrol IGR Liquid Concentrate is an insect growth regulator. Gentrol IGR prevents developing roaches from reaching sexual maturity by inhibiting their growth and breaking the cycle. Gentrol IGR Concentrate travels deep into wall cavities, cracks and crevices, reaching the stored product pests that other treatments miss. Hydroprene, the active ingredient, prevents stored product pest larvae from progressing to the pupal stage of development, so the larvae die before they become breeding adults and future infestations. Gentrol IGR is labeled for food and non food areas.