Evaluating the Bio-efficacy of Phytosterols on Growth, Yield and Shelf Life of Thompson Seedless Grapes

The study investigates the bio-efficacy and phytotoxicity of a phytosterol-based solution containing stigmasterol and campesterol (0.01% w/w SL, branded as Brand) on Thompson Seedless grapevines. The key parameters assessed includes shoot length, leaf area, bunch weight, berry size and physiological loss in weight (PLW) to determine post-harvest shelf life. Results indicated higher concentrations of Brand @ 2 ml/L significantly enhanced growth and yield. Treatment T4 recorded increase in shoot length (115.80 cm), leaf area (165.00 cm2), bunch weight (460.30 g), 50 berry weight (185.60 g) and yield (19.95 kg). Additionally, T4 demonstrated the highest skin and pedicel thickness (0.27 and 0.52 mm respectively), directly contributing to a reduction in PLW (5.20 % at 5th day), thereby enhancing post-harvest shelf life and resilience during storage. The potential of Stigmasterol and Campesterol as sustainable growth enhancers in viticulture.