Folia Horticulturae

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Effect of double-trunk on growth and fruiting of ‘Jonagold’ apple trees

Władysław Poniedziałek, Stanisław Porębski, Bernadeta Rzeźnicka

Department of Pomology
Faculty of Horticulture, University of Agriculture in Kraków
29 Listopada 54, 31-425 Kraków, Poland

A new method of dwarfing apple trees grown in the orchard on P.60 rootstock was investigated. The method is based on the use of an auxiliary trunk or bark grafted onto the main trunk of the tree. The presented method consisted in grafting a 10-cm long section of the shoot or a 10-cm long section of the bark on the tree trunk in the second year after planting. The grafting was conducted after the flowering of the trees. Each year a 1-cm broad ring of the bark was removed from the main trunk. The growth of the trees was not affected by the treatment. The volume of the tree canopy and the length of limb leaders were comparable to control trees, although the trees with grafted shoots had a significantly lower final trunk cross-section area below the place of grafting. The cumulative yield of shoot grafted trees was higher but this was not the case with bark grafting. Both the bark and shoot grafting increased the efficiency of the trees although the shoot grafting was more efficient. This may have resulted from more intensive flowering and a tendency to higher fruit setting in 1998. The shoot- and bark-grafted trees led to a higher yield but smaller fruit size.

Poniedziałek W., Porębski S., Rzeźnicka B., 2001. Effect of double-trunk on growth and fruiting of ‘Jonagold’ apple trees. Folia Horticulturae 13/1: 65-71.