Abstract
Abstract The rootstock has been shown to influence the chilling requirement of pear (Oregon) (9) and peach (New Jersey) (10). This is not surprising because the rest influence moves across graft unions (1) and the scion and stock differ genetically and may have different chilling requirements. However, it has been reported that under the chilling conditions characteristic of the major California pear districts, rootstock had little or no influence on bloom date or chilling requirement (5). Also, budbreak and/or bloom of ‘Croncels’ (3), ‘Delicious’, and ‘McIntosh’ (4) were not influenced by early and late leafing stocks.
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