Effect of variety and pruning on the proportion of bearing wood in apple trees [Malus pumila]
2005
Asada, T.(Hirosaki Univ., Aomori (Japan). Faculty of Agriculture and Life Science) | Hotta, H.
The length and position distribution of 1-year-old bearing wood were compared among 3 varieties and between pruned and unpruned apple trees. In pruned trees, the proportion of long (10 cm) and short (5 cm=, spur) bearing wood in all fruiting laterals with different orientations, were 25.3 and 66.3, 26.0 and 71.0, 13.0 and 81.1% in 'Fuji', 'Jonagold', and 'Starking Delicious (SD)'. The percentage of spurs in 'SD' was higher than those of 'Fuji' and 'Jonagold', being about 90% in unpruned trees. Pruned trees had a lower spur ratio than unpruned trees in 'Fuji' and 'SD'. The proportions of terminal and lateral long wood in pruned trees were 13.0 and 12.4, 13.2 and 12.8, 9.8 and 3.7% in 'Fuji', 'Jonagold' and 'SD'. 'SD' had lower proportion of terminal and lateral long wood than the other varieties. The proportions of terminal and lateral spurs in pruned trees were 18.3 and 48.1, 21.9 and 49.3, 46.1 and 35.1% in 'Fuji', 'Jonagold', 'SD', respectively. Pruning increased the lateral spur ratio and decreased the terminal spur ratio in horizontal and pendant laterals of 'Fuji' and 'Jonagold' and in pendant laterals of 'SD'.
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