The chemical carbaryl is the main active ingredient in the brand Sevin insecticide. Carbaryl is the commercial name for the insecticide chemical known as 1-naphthyl methylcarbamate. Carbaryl is effective against a wide variety of pests, and is often formulated as dusts, wettable powders, liquid concentrates, granules or baits.
While effective against garden pests such as beetles, moths, cockroaches and other insects, carbaryl is also moderately toxic to animals and humans. Animals exposed to carbaryl poisoning may exhibit behavioral changes, excessive tearing and salivation, muscle tremors, twitching, vomiting, and diarrhea. Severe exposure can lead to death. Humans exposed to excess carbaryl may suffer nausea, cramps, muscle weakness and headaches.