Abstract

A disease survey conducted in Acacia aulacocarpa, A. crassicarpa, A. mangium and A. auriculiformis trial plots and plantations in the States of Kerala, Tamil Nadu, Karnataka and West Bengal revealed a large number of new and serious diseases. All the four acacias suffered more from foliar diseases than diseases of other parts. The maximum number of diseases was recorded on A. auriculiformis (28), followed by A. mangium (23) A. crassicarpa (17), and A. aulacocarpa (13) . All the diseases recorded on A. aulacocarpa and A. crassicarpa are new records for India. In the case of A. mangium and A. auriculiformis, except for a few diseases already recorded, the rest are new disease records. Although the number of diseases appeared to be high, the number of fungal genera causing diseases was not high as different species of the same genus produced variable symptoms. The genera most commonly associated with the diseases symptoms were Colletotrichum, Pestalotiopsis, Alternaria