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FROM THE PREFACE: Weeds reduce agricultural output and/or add to the costs of production and are therefore important economically. Moreover weed research scientists, administrators, and farmers make decisions about allocating resources (i.e. make economic decisions) every day. Weed control and economics are inseparable in an agricultural production context and the economic effects of weeds are diverse and complex. In this book we have endeavoured to present a broad but penetrating view of the impact of weeds and assessment of their control. The book is aimed to provide agricultural scientists, administrators, advisors, and students with a greater appreciation of the economic impact of weeds and of the economic assessment of weed control strategies and methods. For agricultural economists, the book will provide an agronomic background and an economic framework for tackling issues in weed control and research.