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Effect of individual and combined essential oils of Cymbopogan caesius and C. nardus on growth of aflatoxin producing fungus Aspergillus flavus and aflatoxin production was investigated in vitro.  Different concentrations (50 ppm, 100 ppm, 200 ppm and 300 ppm) of essential oils significantly inhibited fungal growth and total aflatoxin content in Mycological broth as compared to that of control. Combinations of essential oils had synergistic inhibition of fungal growth and aflatoxin production as compared to their individual oil.  Inhibition of fungal growth in combined essential oils ranged from 37.4% to 100% with an average of 75.7%, respectively. The results of the present study suggest that the synergistic effect of plant extracts can be used for control of fungal growth and aflatoxin production.