Metaldehyde is the most commonly used molluscicide. It usually is sold in the form of slug baits. Metaldehyde can be used around vegetable and fruit Crops as well as in flower Gardens or among nonfood Crops. Metaldehyde is attractive and poisonous to slugs. After feeding on it, the slugs become immobilized and start to produce large amounts of mucous.
Death results from excessive loss of water.
Successful use of metaldehyde baits requires careful application and favorable weather conditions. Slugs often can recover from metaldehyde poisoning if high moisture conditions occur. Also, control is poor during cool periods because slugs are relatively inactive. Apply metaldehyde when the evening is warm and the forecast for the following day is hot and dry. Young slugs are more susceptible than older slugs.