Leaf spots and brown mottled fruit were recorded on Indian mulberry (M. citrifolia L.; Rubiaceae) in Okinawa, Japan during 2007. An Alternaria species was isolated from the diseased leaves and fruits, and typical symptoms were reproduced after inoculation of wounded or intact leaves. The causal agent was identified as Alternaria alternata (Fr.) Keissler based on morphological characters and growth temperature. This report is the first of Alternaria spot of Indian mulberry caused by A. alternata.
