Abstract
Abstract The apricot cultivar ‘Sundrop’ (Prunus armeniaca L.) was planted on 23 different rootstocks at the Clyde Research Centre, Alexandra, New Zealand. Rootstock influence was assessed over a period of 9 years using the following criteria: tree survival, tree health, tree vigour (trunk cross‐sectional area), cumulative yield, cumulative yield efficiency, rootstock suckering, fruit quality (including bacterial marking on the fruit), and fruit size. Possible incompatibility was measured by stock/scion overgrowth and enlarged lenticels on the bark. The six most promising rootstocks could be grouped into three tree size categories: large, intermediate, and small. The best performing rootstocks which produced large trees were ‘Marianna 6.64’ and ‘Marianna GF 8/1’. Both rootstocks produced healthy, productive trees. However, trees on ‘Marianna GF 8/1’ suckered excessively from the roots, whereas those on ‘Marianna 6.64’ did not. Three rootstocks—'Golden Queen’, Prunus armeniaca ’Zailisky’, and ‘Pixy’ produce...
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