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Objectives The gray mold fungus Botrytis cinerea (B. cinerea) infects a wide range of crops before and after harvest, causing huge losses worldwide. Inhibition mechanisms of B. cinerea in vitro and in plants by calcium propionate (CP), generally recognized as a safe substance, are described in this study. Materials and methods Wild-type and transgenic mutant strains of B. cinerea were used in the study to evaluate the effects of CP on fungal growth and development in vitro. Plant materials including tomato leaves and table grapes were tested for controlling efficiency of CP against gray mold deterioration in vivo. Results Mycelial growth of B. cinerea was inhibited by CP in a dose-dependent manner with occasional disruption of hyphal tips, causing cellular collapse and efflux of cell contents. Staining with fluorescein diacetate and propidium iodide indicated that CP decreased fungal cell viability. Inhibition efficiency of CP against B. cinerea was enhanced by reducing pH. In contrast, the vel1 mutant, which exhibited deficiency in acid production, was more resistant to CP, suggesting that inhibition of B. cinerea by CP is enhanced by the acidification ability of the fungus itself. Additionally, CP inhibited infection cushion development by germlings of B. cinerea. Infection assays with tomato leaves and table grapes showed that CP inhibited decay development in both host tissues. Moreover, application of CP on grapes 3 days prior to harvest could contribute to management of deterioration caused by spontaneous fungal diseases during storage. Conclusion CP can suppress hyphal growth, inhibit infection cushion development, and reduce the virulence of B. cinerea. CP is thus promising for practical management of gray mold in fruit crops and merits further evaluation.

Inhibition of Botrytis cinerea and control of gray mold on table grapes by calcium propionate