https://doi.org/10.37229/fsa.fja.2026.08.05

This study examined the effects of foliar spray of chitosan and moringa leaf extract (0.2 or 0.4%) either alone or in combination on Attika Seedless grapevines over the course of two consecutive seasons (2022 & 2023). The vines are trellised using a Spanish Parron supporting system and planted 2 × 3 meters apart. The grapevines were pruned in the first week of January. As compared to the control, the results demonstrated that foliar application of chitosan and moringa leaf extract, either alone or in combination, had favourable effects on the berry quality as well as vegetative development characteristics for Attika Seedless grapevines. Using a 0.4% foliar spray of chitosan and moringa leaf extract together produced the greatest values for improving the vegetative growth characteristics, cluster, and berry quality for Attika Seedless grapevines. Additionally, at a rate of 0.4% treatment with chitosan and moringa leaf extract together ultimately had the best results for controlling powdery mildew. In conclusion, foliar treatment of chitosan and moringa leaf extract may be suggested for Attika Seedless grapevines in order to improve berry quality, increase yield, and control powdery mildew infections.