The plants that are considered as undesirable in the farms, lawns, gardens, parks and fields are known as weeds. The discipline of weed science focuses on weeds, their effect upon human activities as well as their management. It is a branch of applied ecology which seeks to modify the environment against natural evolutionary trends. Various methods such as powered cultivation with cultivators, cultivation with hoes and smothering with mulch and soil solarisation, chemical attack with herbicides, lethal wilting with high heat and burning are used to control weed. This book provides comprehensive insights into the field of weed science. While understanding the long-term perspectives of the topics, it makes an effort in highlighting their impact as a modern tool for the growth of the discipline. This textbook is appropriate for those seeking detailed information in this area.