In vitro assays showed a significant antifungal activity of
aqueous solutions of PGE. Viability of B. cinerea conidia incubated
for 20 h was almost completely inhibited by PGE at 12 g/l and
strongly reduced by 94.0 and 80.0% at 1.2 g/l and 0.2 g/l,
respectively, as compared to the control (Fig. 1). A lower fungicidal
effect was demonstrated for P. digitatum as CFUs were reduced by
80 and 64% at 12 and 1.2 g/l, respectively, but no significant effect
was found at the lowest concentration (0.12 g/l) of the extract
(Fig. 1). In P. expansum viability of conidia was markedly reduced
(57.7%) only by PGE at 12 g/l (Fig. 1).