Presents the latest research in the discovery of new agrochemicals for the control of insects, acarids, weeds, and fungal diseases. Discusses structure-activity relationships in the design of novel agrochemicals and the use of bioisoteres and natural products as lead structures in discovery of new pest control agents. Presents examples of a variety of discovery rationales being used in biological systems. Examines the use of bioassays as indicators of chemical activity in biological systems. Details the synthetic methodology used in the laboratory preparation of a wide variety of biologically active agrochemicals.