Fig. 5.

(A) Lesion diameters and (B) fungal populations on sweetpotato slices and surface layers of roots inoculated with Fusarium oxysporum f. sp. batatas SP-f6, followed by treatments with gaseous chlorine dioxide (ClO₂), respectively. Sweetpotato slices were drop-inoculated with spore suspension (10 μl of 5 × 10⁶ spores/ml) of isolate SP-f6, followed by treatment with various concentrations (5, 10, and 20 ppm) of ClO₂ gas for 0, 10, 30, and 60 min. Roots were dipped in spore suspension (5 × 10⁶ spores/ml) for 10 min and then treated with different ClO₂ concentrations (20 and 40 ppm) for 0, 30, and 60 min. Different lowercase and uppercase letters on bars (n = 3) are significantly different between time at a given concentration and between concentrations at a given time according to the least significant difference test at P < 0.05, respectively.