Sweet cherry (Prunus avium) cultivar, rootstock and training system interactions in Oregon, USA
Sweet cherry (Prunus avium) growers in Oregon produce numerous cultivars of varying productivity. Yield and fruit quality is often cultivar-dependent and may be markedly affected by rootstock and training system. A study to quantify these effects on tree vigor, yield and fruit quality was initiated in 2006 in The Dalles, Oregon. 'Bing', 'Regina', and 'Sweetheart' were grafted onto three different rootstocks ('Mazzard', 'MaxMa 14' and 'Gisela 6'). In addition, 'Sweetheart' and 'Regina' were grafted onto 'Krymsk 5' ('VSL-2') and 'Regina' on 'Krymsk 6' ('LC-52') rootstocks. All scion/rootstock combinations were trained to three systems; a multi-leader bush (KGB), a slender spindle (Vogel Central Leader) and a tri-axe (Steep Leader). 'Gisela 6' in combination with 'Bing' or 'Sweetheart' produced the largest yields. Fourth through 6th leaf 'Bing'/'Gisela 6' yields were 7× higher than 'Bing'/'Mazzard' and 'Sweetheart'/'Gisela 6' yields were 2.3× higher than 'Sweetheart'/'Mazzard'. 'Regina' yields were highest on 'Krymsk 6' which were 3.2× higher than 'Regina'/'Mazzard'. 'Bing', 'Regina', and 'Sweetheart' fruit size across all rootstocks varied little with 'Bing' fruit ≥27.6 mm, 'Regina' fruit ≥28.6 mm and 'Sweetheart' fruit ≥28.46 mm. 'Regina' yields were highest with the Vogel Central Leader training system but fruit size was similar across all three systems. Highest yields with 'Bing' and 'Sweetheart' were produced on the KGB system with no difference in fruit size with any training system.
Long, L.E., Kaiser, C. and Brewer, L.J. (2017). Sweet cherry (Prunus avium) cultivar, rootstock and training system interactions in Oregon, USA. Acta Hortic. 1161, 331-338
Prunus avium, rootstock, Mazzard, MaxMa 14, Gisela 6, Krymsk 5, Krymsk 6, Vogel Central Leader, KGB training system, steep leader