The purpose of this study was to determine the chemical profile of essential oil, carry out an evaluation of its antioxidant potential and its cytotoxicity, as well as its antifungal and antimicotoxigenic activities against . Most of the compounds observed in the EO were neral (32.75%) and geranial (37.67%). The radical scavenging capacity of 2,2-diphenyl-1-picrylhydrazyl and 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid was 104.4 and 56.4 mmol Trolox mg, respectively, indicating good antioxidant activity. The EO studied by us revealed cytotoxic effect against HT-29 and HeLa cancer cells. The Minimum Inhibitory and Minimum Fungicidal Concentrations against were both 125 µg mL. Morphological investigation, performed by fluorescence microscopy and scanning electron microscopy, showed that hyphae and microconidia structures underwent changes after treatment with the EO. Analyses performed with the EO strongly reduced the mycelial development of and the synthesis of fumonisins B and B in dose-dependence effect compared ( < 0.01) with the fungal control (10 conidia mL) and positive control (fludioxonil + metalaxyl-M). Thus, the results obtained suggest that EO has excellent antioxidant, fungicidal, and antimycotoxigenic effects.