Which of the following statements is true about Insect Growth Regulators?

Insect Growth Regulators (IGRs) are specialized pesticides that work by interfering with the normal development and growth processes of insects. They do not kill insects on contact, but instead, they disrupt the hormonal balance necessary for insects to mature through various life stages, such as from larva to adult. This disruption can result in malformed adults or prevent larvae from developing properly, ultimately leading to a decrease in the overall population over time.

IGRs are particularly effective against immature insects and are designed to target specific developmental stages, which is why they do not function as repellents or primarily act on adult insects. Their unique mode of action makes them valuable for integrated pest management, as they help control pest populations without directly causing immediate mortality, thus allowing for more sustainable practices.