The production of VOCs was mainly observed on PDA at pH 4.5 for W. anomalus strains which totally inhibited the mycelial growth of B. cinerea up to 9 days. Also S. cerevisiae produced VOCs which significantly reduced the fungal growth under acidic condition compared to pH 6.0. Fungal inhibition by VOCs produced by M. pulcherrima was significantly higher at pH 4.5, but the efficacy was strain-dependent, as the inhibition of pathogen growth (%) varied from 24.67 to 66.67%.