Performance of 'Celina', 'Ingeborg', and 'Kristina' pear cultivars on quince rootstocks growing in a Nordic climate
Performance of the Quince rootstocks Adams, C and Eline®, all grafted with pear cultivars Celina, Ingeborg and Kristina, were compared at the experimental farm of NIBIO Ullensvang, western Norway. Tree vigour, yield, fruit size and fruit quality were evaluated annually for the first seven years. No severe winter damage was observed during these years and none of the trees died. After seven years there were no significant differences in tree size in Celina and Ingeborg grafted on the different rootstocks, while trunk diameter increase of Kristina was significantly larger on Eline® than on C and intermediate on Adams. Flower development and fruit set were not affected by rootstocks in any of the three scion cultivars. On average, mature fruit were picked during mid to end September and the trees began producing a small crop in the third season. No alternate bearing pattern was identified. For Celina and Kristina yield was similar for trees on all three rootstocks. Cumulative yields for the first five cropping years were 31.3 kg tree‑1 for Celina, 25.9 kg tree‑1 for Kristina and 19.4 kg tree‑1 for Ingeborg. Celina produced the highest total number of fruit when grafted on Adams or C. Trees on Eline® produced a significantly lower number of fruit in both Celina and Ingeborg. On average for all cultivars, no significant effect of rootstock was observed on average fruit weight during these 5 production years. Eline® on average yielded fruit of 165 g for all cultivars while for Adams and C it was 162 g. Soluble solids concentration was high (11.2% on average) but was not significantly affected by rootstocks. Fruit acidity was similar for all quince rootstocks (0.19-0.21%). The fruit development period between full bloom and harvest showed a clear inverse linear relationship with the average daily temperature. In conclusion, because the trees have not reached their full production none of these quince rootstocks can yet be recommended as the preferred rootstock for pear growing in a cool, mesic northern climate.
Meland, M., Frøynes, O., Fotirić Ak¿ić, M. and Maas, F.M. (2021). Performance of 'Celina', 'Ingeborg', and 'Kristina' pear cultivars on quince rootstocks growing in a Nordic climate. Acta Hortic. 1303, 197-204
Cydonia oblonga, Pyrus communis L., rootstock, high density, tree size, yield, fruit quality, quince 'Adams', quince 'C', quince 'Eline®'