This book deals with various approaches for arthropod pest control. One approach is based on disrupting the activity of specific biochemical sites such as neuropeptides, ecdysone and juvenile hormones or tyramine, octopamine and GABA receptors. Another approach is the use of natural products obtained from tropical plants and other biological systems for pest control. Finally, the exploiting of genetically modified insects, plants and symbionts along with male/female call disturbance are important novel tools in crop protection. Countermeasures for resistance to biorational control agents using advanced biological and biochemical approaches are discussed.