Under in vitro conditions, R. mucilaginosa significantly inhibited
the growth of B. cinerea on PDA plates, and the control efficacy of the
combined treatments of R. mucilaginosa and PA at the concentration
of 4 mmol/ml and 6 mmol/ml were better than R. mucilaginosa alone
treatment. In the test of effects of PA on survival of R. mucilaginosa in
NYDB, PA at all tested concentrations significantly increased the
growth and survival of R. mucilaginosa in NYDB. It’s selectivity in
inhibiting the colony diameter of the pathogen but not the growth of
the antagonistic yeast may be one of the mechanisms by which PA
enhances the biocontrol efficacy of R. mucilaginosa