Introduction.- Function and Classification.- Formulations of Insecticides.- Toxicology of Insecticides.- Methods of Testing Chemicals on Insects.- Evaluation of Toxicity in Insects.- Evaluation of Toxicity in Higher Animals.- The Nervous System as Insecticide Target.- The Organochlorine Insecticides.- Insecticides Acting as GABA-Ergic Agents.- Organophosphorus Insecticides.- Carbamate Insecticides.- Botanical Insecticides.- Synthetic Pyrethroids.- Synergists.- Neonicotinoids and Nitrogenous Insecticides.- Compounds Interfering with ATP Synthesis.- Miticides.- Fumigants and Nematocides.- Insect Growth Regulators.- Insect Sterilants.- Attractants, Repellents and Antifeedants.- Microbial Insecticides.- Miscellaneous Compounds.- Molluscicides.- Avicides.- Rodenticides.- Hazards Associated With Pesticide Use.- Insect Resistance.-