The suspension was centrifuged in sterile 50-ml plastic tubes at 6000 rpm for 10 min. The pellets were re-suspended in sterile distilled water to obtain a final concentration of 108 cells ml−1 (OD = 0.5) at 600 nm, which was measured with the viable plate count and optical density methods. One 5-mm disk of pure R. solani Q1 culture was placed in the center of a Petri dish containing potato dextrose agar (PDA). Four drops of the bacterial suspension were placed around the fungal inoculums at a distance of 2 cm. In the control, sterile distilled water was used in place of the suspension. Plates were incubated for 48 h at 28 °C. Each experiment was conducted in triplicate and repeated at least three times.