Which of the following describes an Insect Growth Regulator (IGR)?

An Insect Growth Regulator (IGR) is accurately described as a pesticide that mimics insect hormones. IGRs function by interfering with the hormone systems of insects, which affects their development, reproduction, and growth. They typically do not kill insects on contact like traditional pesticides; instead, they disrupt the normal life cycle processes so that insects cannot mature or reproduce effectively. This hormonal mimicry allows IGRs to be a crucial tool in integrated pest management strategies, particularly in controlling pest populations without resorting to harsh chemicals that might negatively impact beneficial insects or the environment.

The other choices do not accurately represent the characteristics of an IGR. For example, a chemical that eliminates insects upon contact refers to more traditional insecticides rather than IGRs, which have a different method of action. Products that exclusively target plant pests do not accurately encapsulate the broader definition of IGRs, which can affect various types of insects, and a fungicide is meant for controlling mold, which is unrelated to the hormonal regulation of insect growth.