Effects of 3,5,6-TPA on actinidia. 1: Preliminary results [Actinidia deliciosa (A. Chev.) C. F. Liang et A. R. Ferguson - cv Hayward - Campania]
1999
Forlani, M. | Cirillo, C. (Naples Univ., Portici (Italy). Dipartimento di Arboricoltura, Botanica e Patologia Vegetale)
Treatments with 3,5,6-trichloro-2-pyridoxil-oxyacetic acid (3,5,6-TPA) were able to increase fruit weight in many plant species. Very interesting results were obtained on more citrus fruit, on apricot and cherry trees. The treatments increased fruit size, but they caused the appearance of skin and flesh lesions. The aim of this trial was to test the effect of 3,5,6-TPA applied, as a foliar spray, at different concentrations on fruit size and to locate the 3,5,6-TPA dose able to increase the fruit size, without damaging fruits on Actinidia deliciosa, cultivar Hayward. In the experiment, four different treatments were imposed: M0 (untreated control); M10 (10ppm); M20 (20ppm); M30 (30ppm), They were performed when fruits were 27 mm long. At harvest, the total number of fruit was weighed and counted. The number of deformed and fanny fruits, the number of damaged fruits, the total production were determined. Net production, excluding deformed, fanny and damaged fruits, was also determined. The 3,5,6-TPA treatments performed induced significant differences on yield of the cv Hayward. The percentage of damaged fruits, depending on the concentration, was reduced up to 0,97% by spraying the lowest concentration. However, the data have shown a positive influence of 3,5,6-TPA treatments on fruit weight, increasing with the dose. The effect of the growth regulator on fruit size was more remarkable analysing the distribution of the fruits in commercial size classes
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