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While pesticides can be divided into many classes by target organism, mode of action etc for most purposes chemical pesticides are divided into three major groups according to their target organism, that is: insecticides, herbicides and fungicides. These groups are then subdivided into chemical groups such as organophosphates, organochlorines, carbamates etc. This simplified classification effectively groups acaricides, nematicides and molluscicides in with insecticides as many chemicals that have acaricidal, nematocidal or molluscicidal properties are also insecticidal.

References

Barlow, F (1985) Chemistry and formulation. In: Pesticide Application: Principles and Practice. Ed: P T Haskell. Oxford Science Publications: Oxford. pp 1-34.
Brian, R C (19 ) The history and classification of herbicides.
Dent, D R (1995) Integrated Pest Management. Chapman & Hall: London, Glasgow, Weinheim, New York, Todyo, Melbourne, Madras.
Rombke, J & J M Moltmann (1995) Applied Ecotoxicology. Lewis Publishers: Boca Raton, New York, London, Tokyo.
Walker, C H, S P Hoptkin, R M Sibly & D B Peakall (1996) Principles of Ecotoxicology. Taylor & Francis.
Ware, G W (1991) Fundamentals of Pesticides. A self-instruction guide. Thomsom Publications: Fresno USA.