Germination on PDA of spores of Botrytis cinerea after immersion in water (control), 0.5% grapefruit seed extract (GSE), 1% chitosan, 1% chitosan containing 0.1% grapefruit seed extract (GSE) or 0.1% thiabendazole (TBZ) for 60 s. Data are the average of six measurements; the vertical bars indicate standard deviations and columns with unlike letters differ significantly according to Duncan’s multiple range test at P < 0.05.