This book is a comprehensive up-to-date treatise on virus and virus-like diseases of the major crops (cassava, potatoes, sweet potato, yam, rice, maize, sorghum, other cereal crops, cowpea, soyabean, groundnut, common bean, other legumes, banana, pawpaw, cocoa, sugarcane, coconut, palm trees, citrus, tomato, cucurbits, other vegetables, cotton, sunflower and spices) in developing countries and their detection, isolation, biological and molecular characterization, transmission and possible approaches for their control. Also included are chapters on the general impact of these diseases, epidemiology, quarantine and technology transfer.