Plant essential oils for controlling Fusarium oxysporum in soil and plant infections

Overview

Fusarium oxysporum is a destructive soilborne pathogen responsible for significant crop losses worldwide. Current control methods rely on a limited set of chemical fungicides, which raises concerns about environmental impact and pathogen resistance. This research investigates the use of plant essential oils as a natural, sustainable alternative for suppressing Fusarium populations in soil and reducing infection incidence in susceptible crops.

The team has already demonstrated that oregano essential oil reduces the abundance of Fusarium in soil. Building on this foundation, the project will expand testing to a broader range of essential oils sourced from the rich aromatic and medicinal plant biodiversity of Greece. The goal is to identify effective oils and concentrations that can protect crops while preserving soil microbial health.

Technical specifications

Key features:

• Pathogen targeting: Specifically addresses Fusarium oxysporum at high inoculum concentrations (4 × 10⁶ conidia/mL) in controlled soil assays
• Essential oil screening: Evaluation of multiple essential oils from Greek aromatic and medicinal plants at varying concentrations (0, 5, and 20% tested initially)
• Metagenomic analysis: Uses Illumina MiSeq 16S amplicon sequencing to monitor shifts in soil bacterial and fungal microbiome composition in response to oil treatments
• Phenotypic validation: Sensitive plant species will be grown in both inoculated and non-inoculated soils to visually confirm disease suppression
• Comparative design: Parallel testing in Fusarium-infested and clean soils to isolate the effect of essential oils on pathogen suppression versus general microbial community effects
• Soil and oil property profiling: Characterization of soil physicochemical properties and essential oil chemical composition to understand interactions with fungal communities

Technology readiness level

The technology has completed initial proof-of-concept validation. Oregano essential oil has already been shown to reduce Fusarium abundance in soil, with metagenomic sequencing confirming changes in the soil microbiome. The next phase of validation will expand the essential oil panel, optimize concentrations across multiple plant species, and incorporate phenotypic disease assessment in living plants. This positions the research at an early-to-intermediate development stage, moving from controlled soil assays toward broader efficacy and formulation studies needed for practical agricultural application.