A new table grape cultivar Shenyuan

Abstract: Shenyuan is a tetraploid table grape cultivar selected from the cross between Shenfeng and Shenyu with the characteristics of stable bearing habits, uniform coloring and easy cultivation. Artificial hybridization pollination was conducted in 2011 and the seedlings were planted in an experimental vineyard at the Shanghai Academy of Agricultural Sciences in 2013. One hybrid was initially selected in 2015 for its large berry, uniform coloring and strawberry flavor. After four years of observation and five years regional adaptability testing at four different sites, Shenyuan was awarded by the Committee of Shanghai Cultivar Registration in 2023. Shenyuan belongs to Euro-American hybrids with strong vigor. The cane tip is half open with low-density hair, the vine is half upright, and the color of dorsal and ventral side of internodes is green with red stripes. The upper surface of the young leaf is reddish brown and density of prostrate hairs between veins at lower surface is sparse. The shape of the mature leaves is triangular with medium size and there are seven leaf lobes. It is close and U shaped in petiole sinus. Anthocyanin coloration of main veins on upper leaf surface is extremely weak. Mature canes are reddish brown with a smooth surface, and its flowers are hermaphrodite. The clusters are conical in shape and medium in compactness, and has an average weight of 448. The berry is long elliptic-shaped with 32.0 mm in length and 23.9 mm in diameter, and average berry weight of 10.9 g. The berries are usually mulberry color with uniform shape and medium-thickness skin. The flesh is juicy and has rich strawberry flavor, with the average soluble solids content of 18.9% and titratable acids content of 0.48%. Each berry contains 2 to 3 seeds. The budbreak period is in late-March, the flowering period is in mid-May, and the maturity period is in mid-August. The cultivar has good flower bud differentiation with average germination rate of 91.96%, fruiting cane rate of 95.39%, and fruiting coefficient of 1.99. It is suitable for cultivation in Kyoho growing areas. Both pergola and vertical trellis system can be used for training andShenyuan is suitable for medium cane pruning. The suitable yield should be controlled around 15 000- 18 750 kg · hm- 2 . Balanced application of fertilizers and water are based on the budbreak and development period. It is necessary to do well in the prevention and control of pests and diseases during key periods. The application of chemical prevention of gray mold before and after flowering is especially critical.