Abstract
This study investigated chemical constituents of essential oils (EOs) of Thaumatococcus daniellii, Hyptis suaveolens and Hildegardia barteri and their bioactivity against three tomato fruit rot pathogens, Aspergillus terreus, Fusarium oxysporum and Geotrichum candidum. The EOs were extracted using hydro distillation, and their chemical composition was determined by gas chromatography and mass spectrometry, while inhibition was determined by Agar diffusion method. Sesquiterpene hydrocarbons were the major constituents of the EOs of T. daniellii (38.7%), H. suaveolens (49.48%) and H. barteri (48.1%). Caryophyllene, guaiol and β-cubebene were the most predominant constituents of T. daniellii, H. suaveolens and H. barteri EOs, respectively. The EOs effectively inhibited radial growth of the pathogens in the in vitro bioassay and their efficacy was significantly higher than mancozeb. This study has shown the prospects of the EOs and sets the pace for further research in the management of postharvest tomato fruit rot under field conditions.
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