Published online by Cambridge University Press: 01 September 2010
Among the biological concerns expressed about the use of transgenic insecticidal plants are the potential for their genes to spread to wild and cultivated crops, have deleterious effects on non-target organisms, and for insects to evolve resistance to the toxins(s) expressed in the plant (Shelton et al., 2002). These same concerns apply to many other forms of pest management, but transgenic plants have come under more scrutiny than most other strategies. For a broad review of the risks and benefits of insecticidal transgenic plants, the reader is referred to Sanvido et al. (2007). The focus of this chapter is solely on the risks of insects developing resistance to transgenic insecticidal plants and how such risks can be reduced. There is a long history of literature on resistance to conventional insecticides and to traditionally bred plants that are resistant to insects, and they provide a solid foundation for understanding the evolution and management of insect resistance to transgenic insecticidal plants.
A commonly used definition of resistance is that it is a genetic change in response to selection by toxicants that may impair control in the field (Sawicki, 1987). Such changes could result from physiological or behavioral adaptation, although many more examples are from the former. Resistance to traditional synthetic pesticides has become one of the major driving forces altering the development of IPM programs worldwide (Shelton & Roush, 2000).
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