Ten ml of clean filtered 2% sterile agar solution was poured into sterile Petri plates and allowed to solidify. The dilute spore suspension was prepared in sterile distilled water from 10 days old culture of A. flavus. One ml of spore suspension was spread uniformly on solidified 2% of water agar plates. The excess of suspension was aseptically drained off. After 4 h incubation at 28 ± 1 °C, the plates were examined and germinated conidia were located. Single isolated and germinated conidium was marked with ink on the lower surface of the Petri plate. The portion of agar directly below the ink mark was cut and transferred to fresh PDA slants in such a way that the conidium bearing surface is in contact with PDA surface and incubated at 28 ± 1 °C. The pure culture of the fungus was obtained and preserved in refrigerator and sub cultured once in a month.