Abstract:
In spring 1988, a rootstock trial was planted on six sites in five countries with 'Stella' as the common sweet-cherry cultivar and in three countries with 'Rheinische Schattenmorelle' as the common sour-cherry.
In total, six other sweet cherry and two other sour cultivars were added in the various trials.
Common sweet cherry rootstocks were: Inmil, Damil, Camil, Weiroot 10, Weiroot 13, Colt, and (except at one site) Charger.
Occasionally, an additional standard was included.
For sour cherry, the same rootstocks were involved, but Camil was replaced by Weiroot 14. Spring 1989, another trial followed in the same countries with the same cultivars on the rootstocks Gisela 1, 5, 10, and F12/1. Both trials ended after eight years.
Inmil and Gisela 1 came forward as dwarfing rootstocks, but can not be recommended, because of small fruit size (Inmil) or a high degree of incompatibility (Gisela 1; Inmil at some sites). Damil, Camil, Gisela 5 and 10 proved semi-vigorous rootstocks.
Gisela 10, however, was unsuitable because of a fair amount of delayed incompatibility.
Camil was more vigorous than Damil and had a poor leaf condition.
Of the remaining two rootstocks Gisela 5 seems most promising.
Within the vigorous rootstock group, both for sweet and sour cherry, Weiroot 10 and 13 performed so much better than Colt and F12/1, that they might be suitable substitutes for these standards, in spite of their tendency to form root suckers.
With sour cherry, Weiroot 14 did not perform as well as Weiroot 13. Charger, too, can not be recommended because it induced more vigour than Colt.
Although large differences in vigour were similar at all sites, the many interactions between location and/or cultivar with rootstock effects indicate that cultivar-rootstock combinations must be evaluated regionally.
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