gray mold prevalence varied from 97.2% to 97.5% in non-treated fruit, and this value was reduced from 7.9% to 6.1% in blueberries that were exposed to a SO2 concentration × time (Ct) product of 400 (L L−1) h. The relationship between SO2 Ct products and gray mold prevalence under laboratory conditions was best explained by exponential models, which had a determination coefficient (R2) that ranged from 0.88 to 0.96.