Aquatic weeds cause serious problems in water bodies throughout the world. They can, for example, block irrigation and drainage channels, interfere with fisheries, hinder navigation, and have environmentally undesirable effects on fresh-water ecosystems. The problems are most severe in tropical and subtropical countries, but they occur almost everywhere. The management of aquatic weeds poses special problems of its own. The main difficulty is to balance effective treatment against the undesirable side-effects that control operations may have on the ecosystem. This book, which is published for the European Weed Research Society, provides a detailed overview of the ecology and management of aquatic weeds, as well as the present status of aquatic weed problems in various continents. The environmental consequences of aquatic weed control measures are discussed in detail. The book will be of special interest to weed scientists, ecologists, agriculturalists, extension personnel, policy makers, and students.