Effect of different treatments on the radial growth of Botrytis cinerea on PDA plates containing 0.5% grapefruit seed extract (GSE), 1% chitosan, 1% chitosan with 0.1% grapefruit seed extract (GSE) or 0.1% thiabendazole (TBZ). Growth was determined after incubation at 23◦C for 72h when the control growth was at the edge of the plate. Data are the average of three trials; the vertical bars indicate standard deviations and columns with unlike letters differ significantly according to Duncan’s multiple range test at P < 0.05.