Vol. 9, Issue 4, Part G (2025)

In this study, the bio-efficacy of the biostimulant Wilbond, containing β-sitosterol and stigmasterol at a 0.05% concentration was assessed on Thompson Seedless grapevines The grapevines were treated with various concentrations of Wilbond (56.25-150 g/ha) showed substantial improvements, particularly in treatment T₄ (150 g/ha) which increased shoot length (110.27 cm), diameter (7.51 mm) and leaf area (160.12 cm²) as well as bunch weight (450.80 g) and yield per vine (18.33 kg/vine). Berry quality including berry diameter (18.90 mm), total soluble solids (18.70) and skin thickness (0.25 mm). In addition, T₄ treatment reduced physiological weight loss during storage, highlighting Wilbond positive impact on grape shelf-life. Overall, Wilbond application significantly boosted yield, quality and marketability of Thompson Seedless grapes, offering a sustainable alternative to traditional growth regulators for enhanced grape production.