substances. man-made or naturally occurring in insects. that affect growth and development of insects.
insect growth regulators (Wikipedia)
An insect growth regulator (IGR) is a chemical insecticide that kills insects indirectly by disrupting their life cycles. The term was initially proposed to describe the effects of juvenile hormone analogs. Although the term "insect growth disruptor" more accurately describes the actions of IGRs, it did not become widely used. IGRs encompass chemical classes with three modes of action (mechanisms of action): juvenile hormone analogs, chitin synthesis inhibitors, and ecdysone receptor agonists.