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Aldicarb is a carbamate, which works by preventing a certain enzyme from breaking down the chemical substances that transmit nerve impulses.

Aldicarb has been used to poison both wild and domestic animals.

It said authorities believe poachers used a substance containing the pesticide aldicarb, which South Africa banned because of its environmental threat.

Chinese ginger showed traces of a chemical, aldicarb sulfoxide, that is not approved for the root and is a notorious water pollutant, according to the agency.

Colombia bans use of methyl parathion — one of the two pesticides Ms. Grayson mentioned — and effectively bans use of the other, aldicarb, on flowers, as well.