ISHS Acta Horticulturae 199: II International Workshop on Temperate Zone Fruits in the Tropics and Subtropics
EFFECTS OF PACLOBUTRAZOL (PP333) ON VEGETATIVE AND FLORAL DEVELOPMENT FLA 6-3 AND SUNRED NECTARINES |
| Authors: | A.P. George, R.J. Nissen |
| Abstract:
Foliar applications of PP333 at low concentrations were highly effective in suppressing vegetative growth in low chill nectarines during the DWIII phase of fruit development. Two sprays were sufficient to give near maximum growth suppression. Although no significant differences in yields or mean fruit weights were recorded with the foliar applied treatments, the trend was towards higher yields per butt cross-sectional area, a measure of yield efficiency of fruitfulness. Earlier fruit maturity was obtained with increasing number of sprays applied. Autumn soil applications were also highly effective in suppressing vegetative growth in the subsequent growing season. Fruit development was markedly enhanced. Both soil and foliar applied treatments increased floral bud differentiation, as indicated by increases in floral bud weights. No deleterious effects such as phytotoxicities or a reduction in fruit quality were recorded for the range of concentrations or from the methods of application used. Paclobutrazol has considerable potential for controlling tree growth in high density plantings, however rates and timing need to be carefully determined. | |
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