Book excerpt: This volume has 11 Chapters, divided in three Sections viz., Entomology, Nematology and Weeds. It provides complete information about the various techniques used for Allelopathy Research in the field of Entomology, Nematology and Weeds. It is written in a simple and lucid language. It will be very useful to undergraduate and Post graduate students and Faculty for used in Class room and Laboratory experiments and research. We are thankful to Prof. G. S. Dhaliwal, Department of Entomology, Punjab Agricultural University, Ludhiana and Prof. V. Mojumder, Division of Nematology, Indian Agricultural Research Institute, New Delhi for Peer Review of Entomology and Nematology Manuscripts.