What is the primary function of insect growth regulators in pest management?

The primary function of insect growth regulators (IGRs) in pest management is to disrupt the normal development of insects. These chemicals are designed to interfere with the hormonal processes that govern insect growth and metamorphosis. By doing so, IGRs can prevent insects from maturing into their adult forms, thereby reducing their ability to reproduce and survive. This makes them a valuable tool in managing pest populations, particularly in situations where traditional insecticides may be less effective or could harm beneficial insects.

The other choices do not accurately reflect the role of IGRs in pest management. Enhancing insect reproduction would be counterproductive to pest control efforts, as would increasing pest populations. Nourishing beneficial insects is not a function of IGRs, which are specifically targeted at managing pest species.