Texas Pesticide Applicator Practice Exam

True or False: Insect growth regulators are harmful to humans and other vertebrates.

1. True

2. False

3. Depends on the dosage

4. Only if ingested

The correct answer is: False

Insect growth regulators (IGRs) are specifically designed to target and disrupt the life cycle of insects. They work by interfering with the molting process, which is crucial for an insect's growth and development. Because IGRs are formulated to be effective against insect physiology, they typically do not affect vertebrates, including humans. The substances used in IGRs are generally viewed as safe for humans and vertebrates due to their unique mode of action, which does not apply to mammals. This selective toxicity is a significant benefit of using IGRs in pest management, allowing for effective pest control while minimizing the risk to non-target species. Other choices might imply scenarios where IGRs could cause harm, but safety evaluations consider factors such as exposure levels and the specific chemicals used. While dosage can influence the potential effects of various chemicals, IGRs are crafted to be safe at the application rates typically used for pest control, which is why the assertion that IGRs are harmful to humans and other vertebrates is false.