Molluscicides, also known as snail baits and snail pellets, are pesticide

Pesticide

Pesticides are substances or mixture of substances intended for preventing, destroying, repelling or mitigating any pest.A pesticide may be a chemical unicycle, biological agent , antimicrobial, disinfectant or device used against any pest...

s against molluscs, which are usually used in agriculture

Agriculture

Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the...

 or gardening

Gardening

Gardening is the practice of growing and cultivating plants. Ornamental plants are normally grown for their flowers, foliage, or overall appearance; useful plants are grown for consumption , for their dyes, or for medicinal or cosmetic use...

 to control gastropod pests like slug

Slug

Slug is a common name that is normally applied to any gastropod mollusc that lacks a shell, has a very reduced shell, or has a small internal shell...

s and snail

Snail

Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

s that can damage crops by feeding on them.

Molluscicide are usually belonging to three main classes:

• Metal
  Metal
  A metal , is an element, compound, or alloy that is a good conductor of both electricity and heat. Metals are usually malleable and shiny, that is they reflect most of incident light...
  
   salts such as iron(III) phosphate
  Iron(III) phosphate
  Iron phosphate, also ferric orthophosphate, or ferric phosphate, FePO4, is a phosphate of iron. It is one of the few molluscicides approved for use in the practice of organic farming....
  
   and aluminium sulfate
  Aluminium sulfate
  Aluminium sulfate, alternatively spelt aluminum sulfate, aluminium sulphate, or aluminum sulphate; is a chemical compound with the formula Al23...
  
  , relatively non-toxic, also used in organic gardening
• Metaldehyde
  Metaldehyde
  Metaldehyde is an organic compound with the formula 4. It is commonly used as a pesticide against slugs, snails, and other gastropods. It is the cyclic tetramer of acetaldehyde.-Production and properties:...
  
  
• Acetylcholinesterase inhibitor
  Acetylcholinesterase inhibitor
  An acetylcholinesterase inhibitor or anti-cholinesterase is a chemical that inhibits the cholinesterase enzyme from breaking down acetylcholine, increasing both the level and duration of action of the neurotransmitter acetylcholine.- Uses :Acetylcholinesterase inhibitors:* Occur naturally as...
  
  s, highly toxic to other animals and humans, acts also as a contact poison

Metal salt-based molluscicides are not toxic to higher animals while metaldehyde-based and especially acetylcholinesterase inhibitor-based products are highly toxic and have resulted in many deaths of pets and humans.