THE EFFECT OF PLANT GROWTH REGULATOR SPRAYS AND SUMMER SHOOT TIPPING ON THE FRUIT SET AND YIELD OF YOUNG PLUM TREES

Sprays of GA₃ + 2,4,5-TP and/or summer shoot tipping increased the numbers of fruits harvested from young Victoria plums but had no effect on fruit size.
Similar treatments to Marjorie’s Seedling increased fruit size but had no effect on fruit numbers harvested.
The spray treatments reduced floral-bud production on both cultivars.
In the second year of treatment summer tipping again increased the numbers of Victoria fruits harvested; yields on the hormone-sprayed trees were reduced however.
Sprays of paclobutrazol to young Grove’s Late Victoria plums resulted in the abscission of all fruitlets, and this effect was only partially alleviated by supplementary sprays of GA₃ + 2,4,5-TP.

Flowering and Fruit Set in Fruit Trees

A.D. Webster

https://doi.org/10.17660/ActaHortic.1984.149.24