Data from the dual culture assays, performed at two different pH values, showed that all tested yeasts inhibited the mycelial growth of B. cinerea with variable efficacy (Table 1). On the whole, the mycelial growth inhibition of B. cinerea by M. pulcherrima and W. anomalus strains was higher at pH 4.5 than pH 6.0. Otherwise, A. pullulans and S. cerevisiae strains maintained the same biocontrol activity (data not significant) at both pH values.