Bayer purchased Aventis CropScience in 2002, a company that included Union Carbide pesticide operations.

Carbaryl was the third-most-used insecticide in the United States for home gardens, commercial agriculture, and forestry and rangeland protection.

They interfere with the cholinergic nervous system and cause death because the effects of the neurotransmitter acetylcholine cannot be terminated by carbamoylated acetylcholinesterase.

Boone & Bridges 2003 find that larger algae eaters such as Bufo woodhousii benefit from this effect.

[9] Although it can increase survival rates for organisms that benefit from consequential algae blooms, the long term effects of these changes in competition levels and predation can be detrimental to many aquatic ecosystems, particularly those dominated by Anurans.

[5] A leak of MIC used in the production of carbaryl caused the Bhopal disaster, the most lethal industrial accident in history.