This expanded second edition provides comprehensive coverage of the important and growing use of mites as predators or parasites of pest species. The authors have brought together and analysed a wealth of information, providing a simple means of identifying the most important acarine biocontrol agents and providing much new information relating to such important aspects of the subject as mass rearing of mites, the effects of pesticides on acarine biocontrol agents, environmental factors in the use of mites as control agents and economic and commercial aspects.