PRELIMINARY RESULTS ON EFFECT OF PACLOBUTRAZOL ON PEACH
In 1982 the chemical was sprayed at different phenological stages (shuck-off, 28 mm and 43 mm fruit transverse diameter), in single or multiple applications given a total of 2,250–3,000 ppm.
In 1983 the chemical was sprayed at the end of stage I of fruit development at three concentrations (500–1,000–2,000 ppm).
Data indicated that the spray time as well as the concentration appear to be relevant factors in attaining good practical results.
The greatest stimulation of fruit growth was obtained with PP 333 sprayed in three applications (1,500 ppm at shuck-off stage + 750 ppm at 28 mm fruit Ø + 750 ppm at 43 mm fruit Ø), or at 2,000 ppm applied at the end of stage I of fruit development. The effect of the chemical on shoot growth retardation was positively related to both concentration and time of application. No effect was observed on fruit drop.