Efficacy of Pelargonium graveolens essential oils against some postharvest fungal diseases of apple

Abstract

Background: Postharvest diseases that occur in apples are often caused by various pathogenic fungi, causing serious economic loss. The pathogenic fungi Penicillium expansum, Rhizopus stolonifer and Botrytis cinerea are among the most common pathogens in apples. The goal of this study was to see whether Moroccan Pelargonium graveolens essential oil (PGEO) could protect apple fruits from fungal infections after they were harvested (in vitro). Methods: PGEO was characterized by GC-MS and for antifungal assessment, in vitro poisoned food (PF) and volatile activity testing (VA) were carried out. Results: The investigation revealed that PGEO was effective against the three tested phytopathogenic fungi in a dose-dependent manner and this antifungal activity increased with the volatile activity test. The MIC value was 2 µL/mL for B. cinera, and R. stolonifer, and 1 µL/mL for P. expansum. Volatile fraction stops the growth of B. cinera at 40 µL / disc (QMI = 40 µL / disc), and of P. expansum and R. stolonifer at 80 µL / disc (QMI = 80 µL / disc). Conclusion: The current findings show that Moroccan PGEO has powerful antifungal activities, suggesting that it might be used instead of synthetic fungicides to combat apple post-harvest infections.