A new seedless grape cultivar ‘Zifeng'

Abstract: ‘Zifeng'is a new seedless grape cultivar selected from the crossing of‘Ruby Seedless' בBlack Emerald'in 2006. It was initially selected in 2008 for its good appearance, good quality and strong adaptability. Through artificial crossing technology, 1 500 seeds were got in 2009. After regional adaptability testing in different sites (including the middle, northwest, and southeast part of Gansu province) , it was finally selected. We applied for the registration as a new cultivar and got identification certificate from Crop Variety Approval Committee of Gansu Province in 2012.‘Zifeng'is diploid plant.The young shoot tip is opened, and the color is yellow-green with purple reddish. The woody shoots have a red-brown skin and stripes, its tendrils are interval. Young leaves have an invisible green color and without downy hairs. The shape of mature leaf is cordate, the surface of leaf is flat and smooth with green color. Leaf margin is serrate with both sides convex and the petiole is U-shaped. The fruit cluster is conical shape, and the weight is 435 g averagely, which length and width is 18 cm, 13 cm respectively, also it grown in trees for a long time with tolerating store and transportation. The berry is red-violent color, long round shape, and average weight is 4.4 g, and the longitudinal diameter and transverse diameter are 2.1 cm, 1.6 cm respectively. The berries are with crisp pericarp, crisp flesh, middle juice and pleasant sweetness and sourness. The contents of soluble solids, total sugar, total acid, vitamin C is18.5%, 13.6%, 0.32%, 0.0038% respectively. The time from bud breaking to harvest is about 123 d, its maturity date at late August in Lanzhou area.‘Zifeng', having a wide adaptability, can cultivated in the northwest, northern of China. And it has some good characteristics containing early fruit, high yield, stable yield, and strong disease and cold resistance. The second year of planting young trees can bear fruit, and the third year will reach the full fruit stage, also within three years, the yield will be controlled at17.0-24.8 t · hm^-2. Vertical trellis systems and V-frame systems are used suitably in open field cultivation, also the vertical independent long-stem training system were as a pruning mode. After comprehensive screening, the planting density was as follows: the space of plantation as 1 m × 3 m. The cultivar is productive, so fertilizer and water management should be strengthened. Meanwhile, nitrogen-phosphorus compound fertilizer was applied before germination and after fruit setting, and potassium fertilizer reasonably is used during color-turning and fruit expansion period. Before bagging, the grape clusters are sprayed with spectroscopic fungicides, and then bagged after the liquid was dried. For pests and diseases prediction, the control of red spiders, wax cicadas, scale insects, downy mildew, powdery mildew and gray mildew should be focused by taking steps with combining with the physical and chemical control technology in orchard.