Industrial crops are the plants that are cultivated to provide raw materials and value-added products for a diverse array of industries in the international trade. These plants are also natural hosts to numerous viruses. Some prime examples of viral pathogens adversely affecting the yield of industrial crops are PLRV and PVY in potato, SCMV, SCSMV and Fiji disease in sugarcane, and BNYVV and BYSV in sugar beet. The profitable production of industrial crops, thus, requires formulation and application of appropriate sustainable management strategies to contain plant yield losses due to viral infections. The present volume was conceived to pool the expert knowledge from the specialists around the world on such important commercial aspects of industrial crops. The volume contains 22 chapters on the current status of knowledge about symptomatology, economic losses, diagnosis and management of important viral diseases of cacao, cassava, cotton, hop, potato, soybean, sugar beet, sugarcane, sunflower and tobacco. This book is part of the multi-volume Plant Pathogens Series. The information on various topics is advanced as well as comprehensive, incorporating synthesis of the up-to-date researches on the diagnosis and management of viral diseases for optimal yield of industrially important crop plants. Hopefully this volume will be a valuable reference resource for use by students, scientists and researchers and planners. This may also facilitate researchers on novel approaches for handling and management of widespread virus-caused losses in plant production on a global scale.