Which category do Hexaflumuron and Diflubenzuron belong to according to the material?

Which category do Hexaflumuron and Diflubenzuron belong to according to the material?

• A. IGRs (Insect Growth Regulators)
• B. Chlorinated Hydrocarbons
• C. Carbamates
• D. Organophosphates (OPS)

Answer: (A)

These two chemicals are insect growth regulators because they disrupt the insect’s development rather than kill it outright. Hexaflumuron and diflubenzuron inhibit chitin synthesis, which is essential for forming the insect’s exoskeleton during molting. Without proper molting, larvae can’t reach the next life stage, so populations are reduced over time. This action is the hallmark of the Insect Growth Regulators category. They’re not chlorinated hydrocarbons (which are persistent neurotoxic pesticides) and not carbamates or organophosphates (which inhibit acetylcholinesterase and cause acute toxicity). So the correct category is Insect Growth Regulators (IGRs).

These two chemicals are insect growth regulators because they disrupt the insect’s development rather than kill it outright. Hexaflumuron and diflubenzuron inhibit chitin synthesis, which is essential for forming the insect’s exoskeleton during molting. Without proper molting, larvae can’t reach the next life stage, so populations are reduced over time. This action is the hallmark of the Insect Growth Regulators category. They’re not chlorinated hydrocarbons (which are persistent neurotoxic pesticides) and not carbamates or organophosphates (which inhibit acetylcholinesterase and cause acute toxicity). So the correct category is Insect Growth Regulators (IGRs).