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I have been actively working on virus and virus like diseases of citrus for the last 35 years. It had been felt need by citrus virologists in India and abroad to bring out a comprehensive publication on virus and virus like pathogens infecting citrus with special emphasis to the research work done in the Indian subcontinent which is considered as home of citrus. Therefore I decided to write my experiences on citrus viruses gained in India and abroad. While working at the University of California, Riverside, INRA, Bordeaux, France and several research institute in Brazil and my visits to CREC, University of Florida, Australia, China and some other places, I gained on hand experience on several citrus diseases which have not been reported from India like stubborn, citrus blight, leprosies variegated chlorosis and several others. During my research career, it has been my privilege to work on several National and International projects on human resource development and diagnostics in the field of citrus virology. I gained long exposure on virus and virus like diseases working on advanced centre for plant virology at Indian Agricultural Research Institute, New Delhi and its Regional stations at Shimla and Kalimpong. To avoid introduction of viruses through the movement of citrus germplasm, IOCV, FAO, and IBPGR jointly published FAO/IBPGR Technical Guidelines for the safe Movement of Citrus Germplasm Frison and Taher 1991 and the author was also a member of this team. This document is serving citrus industry to check virus movement with planting material or through citrus germplasm from one country to another or from one region to another region.