Selective Inhibition of Flowering on `Braeburn' Apple Trees with Gibberellins

in HortScience
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  • 1 The Horticulture and Food Research Institute of New Zealand, Private Bag 1401, Havelock North, New Zealand
  • | 2 The Department of Fruit Science, College of Plant Science and Technology, Beijing Agriculture University, 100094 Beijing, The Peoples Republic of China

`Braeburn' apple trees were treated with GA3 or GA7 at either 100, 200, or 400 mg·L-1, 2 years after being grafted onto 4-year-old `Royal Gala'/MM.106 trees in order to evaluate their effects on flower bud formation. Inhibition of flowering was observed on 1-year wood only and not on spurs in response to GA treatments applied later than 6 weeks after bloom. GA7 was a more potent inhibitor of flowering than GA3. These results indicate that GA treatments may provide a useful technology for the selective removal of flowers from 1-year wood in apple and may also provide a useful tool for overcoming biennial bearing in apple by inhibiting flower bud formation when applied in the light-cropping year of the biennial cycle.

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