SATI Beyond The Bunch 2nd Quarter 2026

Table 2. Fertility and productivity traits of rootstocks in Phase 1. Ramsey is the control.

Rootstock

Bunch:shoot 1

Bunches per vine 2

Bunch mass 3

Berry mass 4

Harmon y

Medium to low.

Moderate.

Similar to Ramsey overall and at Begin. Medium to low at Yarona.

Low overall. Variable. Similar to Ramsey at Yarona. Higher at Denau and lower at Begin. Similar to Ramsey overall and at all sites except Denau where it was higher. High overall and at individual sites except Denau where it was moderate to low. Similar to Ramsey overall and at Begin and Denau. Lower at Yarona. Similar to Ramsey overall and at Denau and Yarona. Lower at Begin. Low overall. Lower than Ramsey at Begin and Yarona. Similar at Denau. Similar to Ramsey overall and at individual sites.

Paulsen 1103

High to medium.

High.

Similar to Ramsey overall and at Begin. Medium at Yarona. High overall. Not significantly different to other rootstocks at Begin. Low overall and at individual sites. Similar to Ramsey overall and at Begin. Medium to low at Yarona. Low overall and at individual sites. Similar to Ramsey overall and at individual sites. High overall. Similar to Ramsey at Begin and medium at Yarona.

Ramsey

Higher at Yarona relative to Buffelskraal.

High.

Richter 110

High.

Low.

RS-3

High to medium.

High.

RS-9

Low.

High.

Ruggeri 140

Higher at Yarona relative to Buffelskraal.

Moderate.

SO 4

High to medium.

High.

High overall. Similar to Ramsay at individual sites.

1 The ratio of bunches to shoots differed between rootstocks at Buffelskraal and Yarona. This ratio is a measure of fertility. 2 Bunches per vine differed between rootstocks at Yarona. 3 Bunch mass differed between rootstocks for all sites combined as well as at Begin and Yarona individually. 4 Berry mass differed between rootstocks for all sites combined as well as at Begin, Denau, and Yarona individually.

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The first steps of a six-year-long journey of rootstock evaluation.

BEYOND THE BUNCH • 10 • QUARTER 2 • 2026