ArticleScientific reports2026
Laboratory assessment of novel endophytic Trichoderma-based bioformulations for the biological control of sorghum leaf spot and stalk rot diseases.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Stalk rot and leaf spot, caused by Fusarium verticillioides and Curvularia lunata, respectively, are among the most destructive seed-borne fungal diseases of sorghum, resulting in substantial yield losses. In the present study, two novel endophytic strains, Trichoderma asperellum SEPA11A and Trichoderma harzianum SEPA11B, were isolated from healthy sorghum seeds and evaluated for their biocontrol potential and growth-promoting effects. Out of 39 Trichoderma isolates screened, the isolates 35 and 3 exhibited the highest antagonistic activity in dual culture assays, inhibiting the mycelial growth of F. verticillioides by 68.88% and 66.67%, and C. lunata by 57.77% and 59.30%, respectively. Both strains were identified based on morphological characteristics and internal transcribed spacer (ITS) rDNA sequencing and have been deposited in GenBank under accession numbers LC866760.1 and LC866759.1, and coded as SEPA11B and SEPA11A respectively. Gas chromatography-mass spectrometry (GC-MS) analysis of culture filtrates revealed 55 bioactive metabolites, while scanning electron microscopy demonstrated severe ultrastructural damage to pathogen hyphae. A granular formulation of SEPA11B and SEPA11A maintained high viability for up to 14 months under storage. These results collectively indicate that SEPA11B and SEPA11A represent promising, sustainable, and cost-effective alternatives to chemical fungicides for integrated management of stalk rot and leaf spot diseases, with the added as a potential benefit of enhancing sorghum growth and productivity. This unique trait makes seed-derived endophytic Trichoderma isolates promising for effective, persistent biofungicide development. Adapted to the seed-soil interface, they can colonize the rhizosphere, outcompete pathogens, and remain active under field conditions. Thus, they are strong candidates for sustainable biofungicides, pending greenhouse/field validation and large-scale production optimization.
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