Table grape rootstocks in South Africa

LIST OF FIGURES Figure 1: The five most planted rootstocks for table grapes in South Africa in 2017. 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). Figure 3: Trends of available certified table grape vines according to rootstock type (2012-2016). Figure 4: Trends in rootstock use for available certified Crimson Seedless vines (2012-2016). Figure 5. Trends in rootstock use for available certified Prime vines (2012-2016). Figure 6: Rootstock use in South African table grape production regions. Figure 7: Compatibility of various rootstocks with table grape cultivars (average over five seasons from 2012-2016). Figure 8: Compatibility of different rootstocks with Crimson Seedless as scion cultivar (average over five seasons from 2012-2016). Figure 9: Compatibility of two Ramsey clones over all table grape scion cultivars (average over five seasons from 2012-2016). Figure 10: Compatibility of Tawny Seedless with different rootstock clones (average over five seasons from 2012-2016).

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Figure 11: Poor graft union associated with an affinity problem.

LIST OF TABLES Table 1. Distribution of rootstock use according to table grape production region (2017). Table 2. Compatibility between scion and rootstock cultivars for table grapes (average from 2012-2016).

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Table 3. Affinity problems of scion-rootstock combinations of table grapes (results recorded for plant material examined by ARC Infruitec-Nietvoorbij).

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Table 4. Summary of characteristics of the most important rootstocks used for table grape production. Table 5. Performance of rootstocks regarding production as influenced by the biological characteristics of soils in different trial blocks. Table 6. Performance of rootstocks regarding vigour as influenced by the biological characteristics of soils in different trial blocks. Table 7. Performance of rootstocks regarding production as influenced by the physical and chemical characteristics of soils in different trial blocks. Table 8. Performance of rootstocks regarding vigour as influenced by physical and chemical characteristics of soils in different trial blocks. Table 9. Effects of rootstocks on petiole nutrient status during berry set in different trial blocks.

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Table Grape Rootstocks in South Africa 1