Weeds hold an enigmatic and sometimes controversial place in agriculture, where they are generally reviled, grudgingly tolerated, and occasionally admired. Weeds affect crop productivity and quality, and ultimately the sustainability of agriculture. This makes them an important object of scientific study. This book offers a global perspective on weed science by presenting contributions from an outstanding group of researchers in 12 countries, reviewed by over 50 experts. It discusses technologies, which could relieve the negative impacts of weeds on crop production in a way that allows growers to optimise profits and preserve human health and the environment. These technologies represent the science of weed management. The aim of the book is to provide insight and recent progress in the science of weed research. Articles presenting the novel and critical appraisals of specific topics are included. The topics of ecology (i), management of invasive plants (ii), evolutionary biology of foxtail species (iii), the benefits of weeds (iv), ecological and physiological aspects of weed/crop competition and chemical control (v), aquatic weed management and characteristics of weed management systems using information obtained in recent research (vi) are discussed. The volume concludes with in depth discussion on weed management with specific examples. Thus, in totality, the book covers the physiology, ecology and management of weeds and summarizes much of the current state of weed research. The comprehensive coverage of the subject, make this a valuable reference book for both students and researchers. Readers will gain a unique perspective on weed ecology, physiology and management.