Question

Which one of the following is an insect growth regulator?

• A. Carbothion
• B. Diflubenzuron
• C. Benzimidazoles
• D. Diafenthuron

Hint:

Insect growth regulators (IGRs):
- Chitin synthesis inhibitors: Diflubenzuron, Novaluron.
- JH analogues: Methoprene, Altocid.
- Ecdysone agonists: Tebufenozide.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
This question tests knowledge of insect growth regulators (IGRs).

Step 2: Detailed Explanation:
Diflubenzuron is a chitin synthesis inhibitor (insect growth regulator).
It interferes with the formation of chitin in insects.
Carbothion (A): Organophosphate.
Benzimidazoles (C): Fungicides (e.g., Benomyl).
Diafenthuron (D): A mitochondrial electron transport inhibitor (thiourea compound).
Thus, diflubenzuron is an IGR.

Step 3: Final Answer:
Thus, diflubenzuron is an insect growth regulator, which corresponds to option (B).
[0.5cm]