Table grape rootstocks in South Africa

RICHTER 99

V. berlandieri x V. rupestris Synonym(s): R 99 and 99 R

Origin: Bred by F. Richter in France, in 1902

GENERAL CHARACTERISTICS Tolerances relating to: Phylloxera: Very good to exceptional. Nematodes: Moderate against root-knot nematodes; Susceptible to dagger and ring nematodes (2) . Phytophthora : Very poor; not recommended on soils that remain wet for an extended period after

Minimally used for new table grape plantings in South Africa

CULTIVATION CHARACTERISTICS Compatibility: Very good bench and aerial grafting results are obtained. Poor to good according to own results (1) . Affinity: No problems known or observed in trials. Rooting: Very good. Vigour if not grafted: Very high (1) . Vigour if grafted: Good. Petiole nutrient status tendencies: High P uptake; low Ca and Na uptake (1) .

irrigation or rain. Crown gall: Poor. Wet soils: Susceptible. Dry soils: Poor (3) . Saline soils: Moderate. Calcareous soils: Good.

GENERAL: • Minimal use for new table grape plantings in South Africa. • Performance average to poor regarding production and quality in rootstock trials. • Use not recommended for table grapes.

30 Table Grape Rootstocks in South Africa