Ontario Pesticide Training and Certification CORE Practice Exam

Growth regulators act by altering how pests grow and develop, not by delivering an instant kill. They work by interfering with hormonal signals that control molting and metamorphosis or by inhibiting processes like chitin synthesis, so immature pests fail to reach maturity or have reduced reproduction. Because their effect is on growth and development rather than immediate toxicity, describing them as substances that regulate pest growth—either slowing development or preventing maturation—best captures their action. The other options describe rapid killing, direct contact toxicity, or effects on the plant itself (defoliation), which aren’t how growth regulators function.