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An insect growth regulator (IGR) is a substance (chemical) that inhibits the life cycle of an insect. IGRs are typically used to control populations of harmful pests, such as cockroaches or fleas.dvantages [edit]. Many IGRs are labeled reduced risk by the Environmental Protection Agency, meaning that they target juvenile harmful insect populations while causing less detrimental effects to beneficial insects.
Disclaimer. Growth inhibitors or insect growth regulators (any of which is commonly known as an IGR) are products or materials that interrupt or inhibit the life cycle of a pest. Many people loosely use the terms birth control for roaches or birth control for fleas..s another example, roaches that are exposed to either Nyguard IGR, Nylar or Hydroprene cannot shed their exoskeleton or develop a new exoskeleton. This is an important part of the roach life cycle: if they cannot shed their outer shell or grow a new one, they cannot mature any further.