SOME EFFECTS OF AMINOETHOXYVINYLGLYCINE, 6-BENZYLAMINO PURINE AND GIBBERELLINS ON FRUIT SET AND VEGETATIVE GROWTH OF APPLE

Aminoethoxyvinylglycine (AVG) applied as a foliar spray increased the set of self- and open- pollinated ‘Delicious’, and open pollinated ‘Golden Delicious’ flowers.
Applying 6-benzylamino purine (BA) and gibberellins A₄+A₇ (GA₄+A₇) with the AVG also increased set of ‘Delicious’ as compared to AVG or the other growth regulators alone.
AVG increased fruit set on ‘Golden Delicious’ when applied from 7 to 23 days post bloom, and counteracted the thinning action of high rates of GA₄+A₇ on this cultivar.
GA₄+A₇ applied at various post bloom concentrations and timings either had no effect on set, increased set, or reduced set.
Several interactions and effects of AVG and GA₄+A₇ were found on ‘Golden Delicious’ set, seed content and yield depending on concentration and time of post bloom application.
AVG at low concentration increased lateral growth and total shoot growth on apple seedlings and two cultivars in the nursery.
The addition of BA and GA₄+A₇ or gibberellic acid significantly increased lateral extension and total growth.
High concentrations of AVG reduced total growth.

Symposium on Growth Regulators in Fruit Production

L.J. Edgerton

https://doi.org/10.17660/ActaHortic.1981.120.16