A new muscat flavor table grape variety‘Ruidukemei’

 Abstracts: ‘Ruidukemei’is a yellow green, early to middle season table grape variety (Vitis vinifera) withgood eating quality. The original plant was imported from Hungary in 2000, which was the progeny between‘Italia’and‘Muscat Louis’. The vines were propagated by cuttings and planted with the row spaceof 2.5 m and vine space of 1.5 m, it was very productive and had early fruiting capacity, the berries hadyellow skin color and strong Muscat flavor. It was evaluated in regional trials in the districts of Yanqing,Haidian and Pinggu of Beijing, the varieties of‘Xiangfei’,‘Italia’and‘Pearl of Csaba’were also includ⁃ed as controls. It was finally released as‘Ruidukemei’after validation through the Committee of BeijingCultivar Registration and has good market potential for the traits of muscat flavor and large berry.‘Ruid⁃ukemei’is a diploid Vitis vinifera. The vigor of the vine is medium. The shoot tip is half open with no hair,the shoot is upright, distribution and intensity of anthocyanin coloration in shoot tip is light, density ofprostrate hairs on tip is medium, density of erect hairs on tip is sparse. The tendril is discontinuous and bi⁃furcated, the color is near yellow-green. The bud is slightly pointed and slightly held out, anthocyanin col⁃oration of buds is strong. The color of dorsal and ventral side of internodes is green with red strips. The upper surface of a young leaf is pea green (R.H.S. 61/2) color while the undersurface of a young leaf is Spin⁃ach Green (R.H.S. 960/2) color. Average intensity of anthocyanin coloration of six distal leaves prior toflowering is weak. Density of erect hairs between veins at lower surface of 4th distal unfolded leaf is medi⁃um, density of prostrate hairs between veins at lower surface is strong, density of erect hairs on veins atlower surface is medium, density of prostrate hairs on veins at lower surface is strong. The shape of the ma⁃ture leaves is pentagonal with undulate sides, medium thickness. The blade margin is pronounced in undu⁃lation. The petiole sinus is very open and V shaped. The teeth are short with both convex and straightsides. Tooth at petiole sinus is absent and not limited by veins. Upper lateral sinus is closed and shallow,lower lateral sinus is open and deep. Density of prostrate hairs between veins on lower surface of blade isvery sparse, density of erect hairs between veins on lower surface of blade is very sparse, density of pros⁃trate hairs between main veins on lower surface of blade is very sparse, density of erect hairs on mainveins on lower surface of blade is sparse, density of prostrate hairs on main veins on upper surface ofblade is very sparse. The upper surface is green. Anthocyanin coloration of main veins on lower leaf sur⁃face is extremely weak, density of prostrate and erect hairs on petiole is very sparse. The flower is her⁃maphrodite and usually positioned at the fourth node. The cluster of‘Ruidukemei’is conical with singleor double shoulders, has an average weight of 502.5 g, average length of 17.8 cm and average width of11.41 cm. The cluster density is medium to loose. The length of peduncle is medium, approximately 4.41cm. The berry is oval or elliptic shaped, 24.5 mm in length and 19.1 mm in diameter, the average weightis 7.2 g with the maximum of 9 g. The berries are uniform in shape and color, with yellow green color. Thethickness of the skin is medium, medium bloom. The firmness of the berry is medium, the flesh is juicyand crisp, with strong muscat flavor, with the soluble solid contents of 17.2% and titratable acid content of0.50%. The number of seeds per berry is ranged from 2 to 3. In the Beijing area, the time of budburst isusually middle April, and flowering at late May, the fruit ripens in middle to late August. The average rateof fruiting shoot is 74.12% and the yield is about 22.5 tones per hectare. Horizontal trellis system andspur pruning were recommended in the northern area. The vine was susceptible to downy mildew if grownin the open field. A spray program suitable for disease control with most Vitis vinifera cultivars should beapplied. Powdery mildew, Botrytis bunch rot and leafhopper may cause losses if grown in the greenhouse.For commercial production, only 70-90 berries should be left for each cluster, and only one cluster foreach shoot.