In this book presents a critical review on tomatoes for research and development findings integrated from these areas of investigation. As has already been studied that tomato is known as a rich crop for their genetic background, nutritional, medicinal and commercial value throughout the world. Accepting to these importance a little resistant source are available in tomato for biotic & abiotic stresses. Tomato leaf curl virus (ToLCV) is a serious disease for tomato production with substantial yield losses. Production of tomato can be enhanced either by screening of resistant varieties or by inserting resistance gene against ToLCV through traditional breeding or molecular breeding programme. Here discussed about screening and breeding concepts as well as use of molecular markers for identification of resistant sources. Here also explained about introgression of wild species for further improvements of resistant varieties. We also expect that this book will be of valuable reference for students, scientists and researchers in genetics and molecular breeding for tomato crop.