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Performance of 'Clara Frijs' pear on quince rootstocks growing in a cool, mesic Nordic climate

Meland, M., Froynes, O., Kaiser, C.
Acta horticulturae 2014 no.1058 pp. 627-631
acidity, alternate bearing, climate, early development, fruit quality, grasses, herbicides, pears, planting, quinces, rootstocks, soluble solids, spatial distribution, trees, vigor, winter, Norway
Performance of Quince root stocks ‘A’, ‘C’ and ‘Adams’ v. ‘Pyrodwarf’ all grafted to ‘Clara Frijs’, were compared in vivo in western Norway. Two-year-old trees were planted at a spacing of 2.5 x 4.5 m in early fall 2001 and trained to a slender spindle with grass between tree rows and a 1 m wide herbicide strips within the rows. Tree vigour, yield, fruit size and fruit quality were evaluated annually for ten years. No severe winter damage was observed except that one Quince ‘C’ tree died during the third winter. Different root stocks had a significant effect on tree size after ten years of growth. Both Quince ‘C’ and ‘Adams’ produced the smallest trees whereas ‘Pyrodwarf’ resulted in the largest trees as measured by trunk cross-sectional area. Each year, fruit were picked between weeks no. 40-41. Tree precocity was retarded as trees began producing a small crop in the third season and yields peaked in the sixth season. Quince ‘Adams’ was the most productive rootstock averaging 17.6 kg. tree-1 followed by Quince ‘A’ (9.0 kg). Alternate bearing was observed for all root stocks. Fruit size was intermediate, averaging 153 g for all root stocks and was little affected by different root stocks. Fruit soluble solid concentrations were generally high (12.2%) and were not significantly affected by root stocks. Fruit acidity was similar for all Quince root stocks (0.10%) and was significantly higher than fruit on ‘Pyrodwarf’ (0.07%). In a cool, mesic northern climate we recommend Quince ‘Adams’ as a root¬stock, but future investigations need to identify ways of preventing alternate bearing.