This volume provides background theory and practical protocols for bioassays of bacteria, viruses, fungi, microsporidia and nematodes that can be used as biological control agents against insect pests of agricultural and medical importance. In addition, experimental design and statistics, computational modelling for bioassay analysis, and relevant legislation are described. With contributions from internationally recognised scientists from their respective fields, this book will be of particular value to researchers both experienced and inexperienced in this area.