'This second edition of Natural Enemies has been skillfully updated to cover advances in biological control since 2004 which is sure to reinstate it as the standard introduction to the subject for undergraduates and other interested readers. Written by leading international experts, the text is both authoritative and easy to read, and is richly illustrated with fascinating examples of biological control applications from around the world. The expertise of the authors is readily apparent throughout the book and the breadth of coverage of all aspects of biological control is excellent. I highly recommend this text to anyone seeking to develop a course or workshop on the subject due to its comprehensive coverage, accessibility without need for specialist knowledge, and engaging style. It is reassuring to know that a new generation of biological control practitioners will be inspired by this well informed and enthusiastic introduction to the subject.' Nicholas J. Mills, University of California, Berkeley