Associate Certified Entomologist (ACE) Practice Exam

What are the two types of Insect Growth Regulators (IGRs)?

1. Mechanical suppressants and biological agents

2. Adulticides and larvicides

3. Juvenoids and chitin synthesis inhibitors

4. Natural extracts and synthetic chemicals

The correct answer is: Juvenoids and chitin synthesis inhibitors

Insect Growth Regulators (IGRs) are specifically designed to disrupt the normal development of insects, targeting their growth and maturation processes. The two primary types of IGRs are juvenoids and chitin synthesis inhibitors. Juvenoids mimic the action of juvenile hormones, which play a crucial role in maintaining the larval stage in insects. By mimicking these hormones, juvenoids prevent the insects from undergoing successful metamorphosis into adult forms, thereby reducing their populations over time. On the other hand, chitin synthesis inhibitors disrupt the production of chitin, a vital component of the exoskeleton in insects. Without the ability to synthesize chitin properly, insects cannot form their exoskeletons effectively, which is essential during molting. This leads to mortality among targeted insect populations or prevents them from reaching maturity and reproducing. Understanding these two types of IGRs aids pest management strategies, particularly in reducing insect populations without the use of traditional insecticides that might harm non-target species or the environment. The other options presented do not accurately represent the specific mechanisms or classifications of IGRs.