In order to determine the inhibitory effect of chitosan
on radial growth of P. palmivora, agar plates with five concentrations of chitosan (0.125, 0.25, 0.5, 1, and 2 mg/ml) were
tested against this pathogen. The PDA amended with 0.05%
acetic acid served as control, and this in fact showed no
growth differences to a plain medium without acetic acid
(data not shown).