Provides a definitive source of information on the environmental, non-target and human safety aspects of using the bacterium Bacillus thuringiensis (B.t.) as a biological control agent. B.t. is used worldwide as an effective agent for controlling many species of insect pest, either by crop spraying or genetic engineering of crop plants. Recently questions have been raised due to health concerns over inhalation of the bacterial spores, and fears of gene-swapping. This reference provides a well-balanced comprehensive discussion on the subject.