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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.
- 1 - PLS 308 â Public AdministrationTopic: Intergovernmental Relations (IGR)Public Administration in the U.S. is Guided by Four Constitutional Principles ! Federalism: a system that allocates certain powers by a constitution to a national governmentand other substantive powers to a sub-national level of government! 1 - PLS 308 â Public AdministrationTopic: Intergovernmental Relations (IGR)Public Administration in the U.S. is Guided by Four Constitutional Principles ! Federalism: a system that allocates certain powers by a constitution to a national governmentand other substantive powers to a sub-national level of government!