ISHS Acta Horticulturae 395: Dormancy and the related Problems of Deciduous Fruit Trees
EFFECT OF FALL ETHEPHON APPLICATION ON BLOOM DELAY AND FRUIT SET IN JAPANESE APRICOT (PRUNUS MUME SIEB.ET ZUCC.) |
| Authors: | A. Paksasorn, M. Masuda, H. Matsui, H. Ohara, N. Hirata |
| Keywords: | Ethephon (2-chloroethylphosphonic acid), Bloom delay, Prunus mume, Fruit set, Flower bud development |
| Abstract:
The effect of foliar applied ethephon on bloom delay and fruit set was studied in two Japanese apricot cultivars (Shirokaga and Inazumi) during 1992 and 1993. Compared to the control, ethephon applied at 100 ppm in mid October delayed full bloom of 'Shirokaga' approximately 4 days (1992) and 6 days (1993) and that of 'Inazumi' about 7 days (1992) and 11 days (1993). Ethephon at 400 ppm prevented bud opening, whereas concentrations of 50, 75 and 100 ppm gave similar responses with both cultivars. During both years, fruit set in both cultivars was lower in ethephon-treated trees than in the controls. Fall application of ethephon markedly delayed bud development as indicated by both size and weight of the dormant bud. Style and filament length, in particular, were shorter than that in control flowers. | |
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