Antifungal activity of essential oil from Eucalyptus staigeriana against Alternaria alternata causing of leaf spot and black rot in table grapes

Abstract

Alternaria alternata causes leaf spot and black rot diseases in leaves and grapes of grapevines, respectively, and leads to huge economic losses in table grapes production. As natural antifungal agents, essential oils (EOs), which are generally recognized as safe substances, shows strong antifungal activity against fungal phytopathogens. The aim of this study was to determine the chemical composition of Eucalyptus staigeriana EO and its in vitro and in vivo effects against A. alternata. The major compounds of E. staigeriana EO were citral (34.32%, of which 21.83% geranial and 12.49% neral), limonene (20.60%) and 1,8-cineole (12.33%). E. staigeriana EO exhibited the highest inhibitory activity on mycelial growth and conidial germination at 1 µL mL -1 . Moreover, the EO was able to reduce the incidence and severity of leaf spot disease in leaves and black rot disease in table grapes caused by A. alternata. These results represent a possible alternative to reduce the use of synthetic molecules for the control of diseases in postharvest of table grapes and in vineyard.

Phytochemical characterization of forest leaves extracts and application to control apple postharvest diseases

“…under in vitro conditions. More so, Pedrotti et al 79 reported the ability of Eucalyptus sp. to reduce the mycelial growth and colonization of A. alternaria , and to inhibit the sporulation and spore germination.…”

Antifungal activity of poly(ε-caprolactone) nanoparticles incorporated with Eucalyptus essential oils against Hemileia vastatrix

“…The aerial parts of trees are a rich source of essential oils that are used commercially in the food and pharmaceutical industries (Nwabor et al 2019;Yadav et al 2019). Several phytochemical studies have reported the antifungal potential of Eucalyptus essential oils against a wide range of economically important phytopathogenic fungi, including Alternaria alternate, Hemileia vastatrix, Botrytis cinerea, Rhizopus stolonifer, Aspergillus flavus, Aspergillus niger, Aspergillus terreus and Fusarium culmorum (Caetano et al 2020;Elgat et al 2020;Silva et al 2020;Pedrotti et al 2022).…”