Innovative Application of Botanical Essential Oils as Potent Agents for Managing Post-Harvest Fungal Pathogens

This study explores the antifungal efficacy of essential oils (EOs) extracted from a diverse array of botanical sources against Botrytis cinerea, an ubiquitous phytopathogen responsible for post-harvest decay. Among the EOs assessed, ten exhibited pronounced fungicidal activity, including those derived from Eucalyptus citriodora, Chenopodium ambrosioides, Ocimum canum, Ocimum gratissimum, Ocimum sanctum, Eupatorium cannabinum, Lawsonia inermis, Zingiber cassumunar, Zingiber officinale, and Prunus persica. Each of these oils achieved complete inhibition of pathogen growth (100%). The study focused on EOs from Ocimum sanctum, Prunus persica, and Zingiber officinale due to their lower Minimum Inhibitory Concentration (MIC) values compared to other oils. Analytical standardization based on physicochemical properties and evaluation of antifungal potency revealed MICs of 200 ppm for Ocimum sanctum and 100 ppm for both Prunus persica and Zingiber officinale. At these concentrations, the oils exhibited fungistatic properties and thermostability. They also demonstrated broad-spectrum fungitoxicity against fifteen additional post-harvest fungal pathogens and maintained efficacy even under high inoculum pressure. Notably, the antifungal performance of these EOs exceeded that of conventional synthetic fungicides. In practical applications, managing gray mold in grapes during storage yielded promising outcomes. Grapes treated with Ocimum sanctum oil experienced an extended shelf life of up to 5 days, while those treated with Prunus persica oil showed a 4-day extension. Grapes treated with Zingiber officinale oil demonstrated an extended shelf life of up to 6 days, with no detrimental effects on the integrity of the fruit's epidermis. These findings suggest that EOs from Ocimum sanctum, Prunus persica, and Zingiber officinale have significant potential as sustainable, eco-friendly botanical fungicides. However, further comprehensive and long-term field trials are necessary to validate their efficacy under practical agricultural conditions.