Fruit were fumigated at 20 ±1 ◦C and 92% relative humidity (RH), determined with a Hobo Pro RH/Temperature (Onset Computer Co., MA), using a continuous SO2 stream (2.5 mL s−1) at final outflow concentrations of 22.5, 50.2
or 101.6 L L−1, which were reached at 6, 5 and 3 h, respectively, after the beginning of the fumigation process (Fig. 1).