The field of plant genetic engineering has arisen from the laboratory and into the market place as a technology to provide farmers and consumers with improved crops. 1996 marks a turning point as the first genetically engineered crops to control agronomically important pests are registered for commercial sale. In most cases it has taken over a decade to develop commercially viable products. This book serves both as an update of current technologies that have been proven successful for engineering insect tolerant crops and an overview of new technologies that are being pursued for the development of new genetically engineered crops in the future. The book includes an introductory chapter on the world wide importance of insect problems in crops and the advantages of genetically engineered crops over traditional breeding; reviews insect control principles that are being develpoed for genetically engineered crops; and provides an overview of many new areas that wil lead to new insect control agents in the next decade.