The Combination of α-Fe₂O₃ NP and Trichoderma sp. Improves Antifungal Activity Against Fusarium Wilt

Soil-borne plant pathogens are the most damaging pathogens responsible for severe crop damage. A conventional chemotherapy approach to these pathogens has numerous environmental issues, while biological control agents (BCAs) are less promising under field conditions. There is an immediate need to develop an integrated strategy for utilizing nanoparticles and biocontrol to manage soil-borne pathogens, such as Fusarium wilt, effectively. Simulation of BCA metabolites to nanoparticle biocontrol metabolites is considered the most effective biocontrol approach. Combining Fe₂O₃ nanoparticles and Trichoderma in nursery and field conditions manages pathogens and increases plant growth characteristics. The present study evaluated the commercial biocontrol strains and the use of NPFe in combination with Trichoderma harzianum to enhance the biocontrol potential of T. harzianum against soil-borne pathogens. The effectiveness of (NPFe + T. harzianum) was evaluated under in vitro conditions where combination was found most effective upto (87.63%) mycelial growth inhibition of pathogen and under field conditions lowest pooled Fusarium wilt incidence (19.54%) was recorded. Nanocomposites are beneficial for agricultural sustainability and environmental safety by upregulating the expression of genes linked to these processes, Fe NPs can activate plant defense mechanisms and increase plant resistance to pathogenic invasions. Additionally, as iron is a necessary component for plant growth and development, Fe NPs promote better nutrient uptake.