This book primarily focuses on the importance of natural herbicides (allelochemicals) in biological control of weeds. Trials were carried out to investigate efficacy of sole natural herbicides and their mixture with reduced doses of synthetic herbicides to control weeds with an over all objective of minimizing reliance on synthetic herbicides. Specific objectives of the study were: to assess the effect of natural herbicides on seed germination and seedling growth of wheat and its weeds under laboratory conditions, to screen natural herbicides and evaluate the possible synergistic effect of their mixed application with synthetic herbicides on growth of wheat and its weeds control under field conditions. This comprehensive and profusely illustrated book will be highly valuable for under-graduate and post-graduate students of Agriculture and researchers involved in the biological control of weeds and enhancing crop yields in an environment friendly manner. Therefore, this book should be available in each library.