Biological control is among the most promising methods for control of pests, diseases and weeds, and this book treats ecological and societal aspects together for the first time. The aim is to evaluate the significance of certain biological properties like biodiversity and natural habitats. In a societal approach terms like ¿consumer¿s attitude¿, ¿risk perception¿, ¿learning and education¿ and ¿value triangle¿ are recognized as significant for biological production and human welfare.