How do insect growth regulators (IGRs) function?

Insect growth regulators (IGRs) function by disrupting the normal development of insects, which directly affects their ability to mature, reproduce, and ultimately survive. IGRs mimic hormones that are critical for insect growth and metamorphosis, thus interfering with processes such as molting and reproduction. By altering these growth processes, IGRs can prevent young insects from reaching maturity, leading to a decrease in the pest population over time.

This mechanism differs significantly from options that suggest enhancement of growth or immediate mortality. Instead of killing insects on contact or enhancing their growth, IGRs strategically target specific developmental stages, leading to an overall reduction in pest numbers without the need for traditional insecticides that act more directly. Additionally, while the attraction of beneficial insects can be important in integrated pest management (IPM), it does not pertain to the core functionality of IGRs, which specifically focus on disrupting the life cycle of target insects.