Abstract
Abstract Spur-type ‘Delicious’ apple nursery trees do not naturally branch in the nursery. In several experiments during 2 years, combinations of immature leaf removal (LR), BA, and gibberellins 4 + 7 (GA4+7) at 750 and 1000 mg·liter–1 induced lateral shoot formation of Campbell and Mercier strains of ‘Redchief Delicious’ trees in a commercial nursery. Split applications of BA and GA4+7 at 1000 mg·liter–1 induced more and longer branches than simultaneous applications. GA3 did not substitute for GA4+7 in this response. Removing young shoot tip leaves increased branching only when very young leaves were removed during a period of 2 weeks. Chemical names used: N-(phenylmethyl)-1H-purine-6-amine (BA), gibberellin (GA).
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