Table grape rootstocks in South Africa

Availability of certified grafted table grape vines per rootstock type: A comparison over two five-year periods

According to the data in Figure 2 (a and b), it is evident that the rootstock cultivars used for table grapes have changed markedly over the past 15 years. A comparison of data for the two periods shows a significant change in the use of each rootstock type.

In the period 2002-2006, Ramsey and R 110 represented nearly 90% of the available certified, grafted vines. From 2012 to 2016, the available and certified grafted Ramsey and R 110 vines markedly decreased (collectively 78%), while the availability of US 8-7 increased. The availability of 143 B Mgt and R 99 declined to below 1% during the same period.

RAMSEY

R 110

P 1103

143 B Mgt

R 99

US 8-7

OTHER

(a)

(b)

18.0%

17.0%

3.5%

13.7%

2002 - 2006

2012 - 2016

2.3% 0.7% 3.1% 1.2%

65.5%

3.3% 0.3% 0.2%

71.3%

FIGURE 2: Certified grafted table grape vines available according to rootstock type as reported by grapevine nurseries to PlantSA, listed as a percentage of the total number of vines over two five-year periods: 2002-2006 (a) and 2012-2016 (b).

Source: Compiled from data made available by (a) SAWIS (2002-2006) and by (b) PlantSA (2012-2016). Where availability of rootstocks is < 0.1% is included under “Other”

Table Grape Rootstocks in South Africa 13