A major expansion of tropical acacia plantations for industrial use has occurred in recent decades, especially in South-East Asia and also in India. The most widely planted species have been Acacia mangium and A. auriculiformis. Trial plantings of A. crassicarpa and A. aulacocarpa have also been established in many locations. The authors of this manual, with their colleagues and with pathologists from Thailand and Indonesia, have surveyed plantations of these species in northern Australia, Indonesia, Malaysia, Thailand and southern India to determine the main diseases present. This manual provides plantation managers and forest health practitioners with short, illustrated accounts of diseases of tropical acacia plantations. A simple key, based on disease symptoms, leads the reader to descriptions of pathogens, photographs of disease symptoms and mycological drawings which will assist in diagnosis of disease. Information is also provided on disease impacts, control and management.