Table grape rootstocks in South Africa

HARMONY

Origin: Bred by J.H. Weinberger and F.N. Harmon in California, USA, released in 1965

1613 Couderc x Dog Ridge Synonym(s): None

GENERAL CHARACTERISTICS Tolerances relating to: Phylloxera: Moderate. Nematodes: Good against root-knot nematodes; poor against dagger and ring nematodes (2) . Phytophthora : No information or data available.

Performance regarding production is poor under South African conditions.

CULTIVATION CHARACTERISTICS Compatibility: Good; problems with Sultanina and Merbein Seedless reported overseas. Affinity: No problems known or observed in trials (1) . Rooting: Good. Vigour if not grafted: Good (1) . Vigour if grafted: Moderate to poor, but less vigorous than Freedom according to local table grape trials (1) . Petiole nutrient status tendencies: Low N and Fe uptake (1) .

Crown gall: Moderate. Wet soils: Moderate. Dry soils: Moderate to poor (4) . Saline soils: Good. Calcareous soils: Moderate (4) .

GENERAL: • Long-term research trials show that Harmony performs poorly with table grape cultivars under South African conditions. • The trials were conducted in a wide range of soils (sandy loam and loam), climatic (Western Cape and Lower Orange River region) and cultivation conditions.

42 Table Grape Rootstocks in South Africa