Given the essential role that primary producers play in aquatic ecosystems, it is imperative that the potential risk of pesticides to the structure and functioning of aquatic plants is adequately assessed. This text discusses the assessment of the risk of pesticides with herbicidal activity to aquatic macrophytes. By integrating regulatory and research information from key specialists in the area of environmental regulations, this book provides a state-of-the-art guide to ecotoxicological risk assessment. Regulators, academics, and industry scientists who are well-known experts in the field address issues such as the selection of additional species and critical regulatory endpoints.