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In the present study, an attempt was made to investigate the effect of water activity(Aw) of rough rice on the growth of Fusarium moniliforme NRRL 13569 as well as on the production of Fumonisin B,(FB,). The maximum growth of F. moniliforme and the production of FB₁, occurred at Aw 0.97 when the Aw of rough rice was controlled from 0.85 to 0.97. The fungal growth and FB₁, production decreased with the decrease of Aw. Sparse growth of fungus was observed even at Aw 0.85. FB, production on rough rice decreased considerably under Aw 0.97 and the trace amounts of FB₁, were observed at Aw 0.93 and 0.90. Therefore Aw required for the prevention of FB₁, production was turn out to be below 0.90 while that of fungal growth below 0.85.
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