Table grape rootstocks in South Africa

SO4

Origin: Bred by the Viticultural School in Oppenheim, Germany and selected by S. Telekei en H. Fuhr, 1896

V. berlandieri x V. riparia Synonym(s): Selection Oppenheim No. 4

GENERAL CHARACTERISTICS Tolerances relating to: Phylloxera: Moderate. Nematodes: Good (2) against root-knot and poor against dagger nematodes. Phytophthora : Poor. Crown gall: Moderate. Wet soils: Good. Dry soils: Poor to moderate. Saline soils: Poor. Calcareous soils: Moderate to good (4) .

Should be evaluated on a semi-commercial scale for use with table grapes in South Africa.

CULTIVATION CHARACTERISTICS Compatibility: Good (1) . Affinity: No problems known or noted in trials. Rooting: Good. Vigour if not grafted: Moderate to good (1) . Vigour if grafted: Mostly moderate; but poor in some trials (1) . Petiole nutrient status tendencies: High Ca uptake and low Na uptake (1) .

GENERAL: • Long-term trial results under South African conditions showed that production and quality performance with table grapes are good to very good (even better than Ramsey). • Trials were conducted over a wide range of soils (sandy loam, loamy sand, loam and sandy clay loam). • Colour manipulations are, however, still necessary.

38 Table Grape Rootstocks in South Africa