A text book covering the major aspects related to weeds, herbicide is indispensable for students, researchers and extension workers. This book is a precise account of various theoretical aspects of weed management presented in a simple language suitable for B.Sc., (Hons.), Agriculture & Diploma students. The guide has been prepared keeping into consideration the practical requirements of the students especially for Agronomy (Weed Management). The information on weed identification of common weeds present in field crops, aquatic systems, non cropped areas and preparation of weed herbarium based on leaf, shape, margins and venation, flower and fruits shapes, determination of crop-weed competition will help to know the nature and extent of weed problem so that an efficient weed management strategy could be worked out.