Abstract
Abstract
Background
High losses of sorghum crops due to fungal diseases, such as grain mold and stalk rot, are economically harmful and cause increased use of environmentally damaging chemical fungicides, which also are detrimental to human health. Hence, finding safe and effective ways to manage fungal diseases of sorghum is urgently needed.
Results
In the present study, the antagonistic activities of Trichoderma viride and T. harzianum against different pathogenic fungal strains were evaluated in vitro using a dual culture assay. Furthermore, the anti-mycotic activity of Trichoderma spp. culture filtrates was evaluated against different fungal strains using a food poisoning technique. Additionally, the antifungal activities of ethyl acetate extracts of T. viride and T. harzianum against different pathogens were evaluated using a disk diffusion method. As indicated by the dual culture assay, T. harzianum suppressed 66.8, 69.5, 68.7, 54.6, 84.12, and 71.39% of the mycelial growth of Curvularia lunata, Exserohilum rostratum, Fusarium chlamydosporum, F. incarnatum, F. proliferatum, and Macrophomina phaseolina, respectively. T. viride was more effective for controlling the growth of these pathogens, inhibiting 81.0, 89.0, 63.0, 70.7, 84.4, and 71.8% of mycelial growth, respectively. Both E. rostratum and M. phaseolina showed resistance to carbendazim fungicide at all tested concentrations, whereas the fungicidal concentrations of carbendazim against C. lunata, F. chlamydosporum, and F. incarnatum strains were 2.50, 1.50, and 2.00 ppm, respectively. Furthermore, F. proliferatum was sensitive to carbendazim fungicide at all tested concentrations. Antifungal assays of the ethyl acetate extracts of T. viride and T. harzianum indicated the potent activity of these extracts against fungal phytopathogens with different susceptibility patterns. F. chlamydosporum was the most sensitive to the extracts of T. viride and T. harzianum with minimum inhibitory concentrations of 0.5 and 1.0 mg/disk, respectively.
Conclusion
The potent suppression of sorghum phytopathogens by T. viride and T. harzianum makes them potential sources of safe and effective natural fungicides compared to carbendazim fungicide.
Publisher
Springer Science and Business Media LLC
Subject
Insect Science,Plant Science,Agronomy and Crop Science,Ecology
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