The book provides different methods of varietal characterization in tomato and their applicability in tomato seed genetic purity and grow out test. The bill on IPR passed in 2001 as "Protection of plant varieties and farmers Rights act" (PPV&FRA) 2001 envisages that the new and notified/extant plant varieties will be registered and protected on the basis of their morphological characters i.e., Distinctness (D), Uniformity (V) and Stability(S) [DUS]. When compared to graminae crops, work on characterization of vegetable crops are meagre. In addition to DUS test, this book also covers chemotaxonamical methods and electrophoresis techniques in tomato varietal characterization and their advantages over DUS test. This book will be useful for the researchers working in the field of varietal characterization and releasing new varieties of tomato.