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The main goal of this book is to present a summary of the state of the art historical background. Conventional chemical pest control methods are mentioned only as a means of comparison to controlled release. Research endeavour with biological weapons, potential usage of such controls, and the few instances of success are likewise brought into focus with the same motive. Formulations and methods or preparing controlled release pesticides are discussed in some detail as concerns the antifouling and molluscicide areas, where the compounding methodology has been well developed. The mathematical basis of controlled release has been developed to an extent and is presented in an abbreviated form.