Texas Pesticide Applicator Practice Exam

What is the role of a chitin synthesis inhibitor?

1. It kills mature insects

2. It interferes with insect growth and molting

3. It repels insects

4. It promotes insect reproduction

The correct answer is: It interferes with insect growth and molting

A chitin synthesis inhibitor functions primarily by interfering with insect growth and molting processes. Chitin is a vital component of the exoskeleton in insects, and its synthesis is crucial during various stages of an insect's development, particularly during molting. When an insect attempts to molt, it needs to form a new exoskeleton made of chitin. By inhibiting the synthesis of chitin, these substances prevent the insect from successfully undergoing this process, leading to issues such as deformities or inability to shed the old exoskeleton. As a result, the insect may die before it can mature, or it may become vulnerable to predation and environmental factors. The other choices pertain to different types of pest control. Killing mature insects is not the primary mechanism of action for chitin synthesis inhibitors; rather, they target the developmental stages. Repelling insects is a distinct action that would involve different classes of pesticides, such as insect repellents. Promoting insect reproduction goes against the intended purpose of a chitin synthesis inhibitor, as these compounds are designed to disrupt and hinder the life cycle of the insect rather than enhance its reproductive capabilities.