ISHS Acta Horticulturae 112: Symposium on Breeding and Machine Harvesting of Rubus
EFFECT OF ETHEPHON ON CANE DEVELOPMENT, FLOWERING AND FRUITING OF THE FALL-BEARING RED RASPBERRY CULTIVAR HERITAGE |
| Author: | G. Redalen |
| Abstract:
Canes of fall-bearing red raspberries (cv. Heritage) were treated with ethephon in mid July, 1977 and 1978. Plots were sprayed with concentrations of 500, 1000 and 2000 ppm and were compared with unsprayed plots. Ethephon caused significant reductions in cane diameter and cane height, but did not affect the number of buds per cane. The number of vegetative laterals near the cane base increased with increasing concentrations of ethephon. The two lowest concentrations of ethephon slightly increased the number of opened flowers in October. Therefore the total number of flowers and berries was enhanced. In contrast, the highest concentration resulted in a reduction in the number of flowers and berries. All concentrations decreased the number of berries, and this was apparently due to a later ripening. Ethepon reduced the number of styles per flower, but did not affect the number of drupelets per berry. Per cent drupelet set was not significantly affected. | |
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