This book is the result of the 12 keynote addresses from the symposium. These presentations were organized around the following themes: genetic structure of pest and natural enemy populations (Burdon and Thrall, Wajnberg), molecular diagnostic tools in biological control (Heraty, Evans and Gomez), tracing the origin of pests and natural enemies (Roderick, Brown), predicting evolutionary change in pests and natural enemies (Müller-Schärer and Steinger, xiii ch00-prelims.qxd 10/30/03 2:50 PM Kraaijeveld), compatibility of transgenic crops and natural enemies (Obrycki etal., Hilbeck), and genetic manipulation of natural enemies (Poppy and Powell, Stouthamer).