Fig. 2

Antagonistic activity of the SCB-1 culture supernatant, crude extracts, and volatile organic components. a Antifungal activity of the culture supernatant against four test fungi (Cochliobolus hawaiiensis SC2.3, Curvularia senegalensis SC4.1, Alternaria alternata SC6.2 and Fusarium oxysporum SC7.1) on PDA plates. Photographs were taken after 72 h of inoculation. b and c Growth diameter of the fungal colonies challenged with 0 ppm (control), 250 ppm and 500 ppm of bacterial crude extract after 48 h and 72 h, respectively. Asterisk (*) and double Asterisk (**) indicates level of significance over control with p ≤ 0.05 and p ≤ 0.01, respectively (t-test, Microsoft Excel 2013). d Inhibitory activity of bacterial volatile organic components against the test fungi. Results are represented as the inhibition percentage of the colony diameter of the test fungi at different time interval. The different letters (a-e) above the bars represent significant differences (p ≤ 0.05) in the inhibition percentage for individual test fungi, otherwise non-significant