Question

Which one of the following is NOT a carbamate nematicide?

• A. Diazinon
• B. Aldicarb
• C. Carbofuran
• D. Oxamyl

Hint:

Aldicarb, Carbofuran, and Oxamyl are carbamate nematicides, whereas Diazinon is an organophosphate compound.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Nematicides are chemical agents used to control plant-parasitic nematodes.
These chemicals are classified into different groups based on their active chemical structures, such as organophosphates, carbamates, or halogenated hydrocarbons.

Step 2: Detailed Explanation:
Let us analyze the chemical groups of the nematicides listed:
1. Aldicarb (B): A systemic carbamate insecticide and nematicide (commonly sold as Temik) that inhibits acetylcholinesterase.
2. Carbofuran (C): A broad-spectrum carbamate insecticide and nematicide (commonly sold as Furadan).
3. Oxamyl (D): A systemic carbamate insecticide, acaricide, and nematicide (commonly sold as Vydate).
4. Diazinon (A): A synthetic organophosphate insecticide and nematicide.
It belongs to the organophosphate group, not the carbamate group, although it also inhibits acetylcholinesterase.
Therefore, Diazinon is not a carbamate nematicide.

Step 3: Final Answer:
Therefore, Diazinon is the compound that is not a carbamate nematicide.