Paclobutrazol (PP333) is a promising new bioregulant for controlling size of trees and significantly reducing the need for dormant and summer pruning. ‘Delicious’ trees were treated with a high rate of PP333, which resulted in some smaller, flattened fruit with shorter pedicels. Application of either gibberellin A 4+7 plus 6-benzylamino purine (Promalin) or gibberellin A 3 (GA 3 ) before or at full bloom increased fruit size, pedicel length, and leaf size on PP333-treated trees.
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Curry et al. (1983) studied this question.