‘Guipu No.15’ is a new red table grape cultivar (Vitis vinifera) with strong muscat flavor, which was bred from the cross between ‘Shine muscat’ (♀) and ‘Ruidu Hongmei’(♂) in 2018. More than 1200 hybrid seeds were obtained by artificial pollination at July 2018. They were planted in nutrition cups in greenhouse in November 2018 and then transplanted in the grape plot at May 2019, the seedlings were normally watered and pruned. The hybrid progeny first flowered and bore berries in 2020. We found the berries of a single shoot, which was named as ‘2018Y*HM-80’, were bigger than other shoots, and had strong muscat flavor and well differentiated flower buds. Owing to its high quality and great potential in the market, ‘2018Y*HM-80’ was grafted on ‘5BB’ rootstock for further regional trials at July 2020. Through 3 years of continuous observation on the growth and fruiting habits of grafted seedlings, ‘2018Y*HM-80’ vine showed stable berry economic characteristics and high-yield performance with good quality, and it was released as ‘Guipu No.15’ with the registration code of GPD grape (2023)450030 after the validation by the Ministry of Agriculture and Rural Affairs of the People’s Republic of China in 2023. ‘Guipu No.15’ belongs to the hybrid of V. vinifera and V. labrusca. The tree vigor is moderate. The tip of the young shoot is half-open with density vertical villi, and the mature shoot is yellowish-brown.The color of dorsal side of internodes is red, while the color of ventral side of internodes is green with red strips.Yong leaf is reddish brown and have density white fluff. The mature leaf is medium size, heart shape, green and pentagonal. The lower surface of leaf is covered by density white fluff. The upper lobe is deep and closed, while the lower lobe is shallow. The cluster of ‘Guipu No.15’ is conical, moderate tightness without shoulder. The shape of berries is oval with red peel, and the peel is moderate and covered with thin fruit powder, the flesh quality is fine and firm, and there are 1-2 seeds in each berry. ‘Guipu No.15’ is suitable for two-crop-a-year cultivation in subtropic areas. In Nanning, GuangXi, The first season fruit ripens at late June. The average weight of each cluster is 620g with the maximum of 1044g. The average weight of each berry is 11.6g with the maximum of 16.5g, the total soluble solids is 19.5% and the titratable acidity is 0.32%. The second season fruit ripens at late December. The average weight of each cluster is 480g, the average weight of each berry is 9.78g with the maximum of 14.23g, the total soluble solids is 18.5% and the titratable acidity is 0.68%. It is suitable for rain shelter cultivation in Nanning, Guangxi and similar areas.
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