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International Society for Horticultural Science

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ISHS Acta Horticulturae 838: Workshop on Berry Production in Changing Climate Conditions and Cultivation Systems. COST-Action 863: Euroberry Research: from Genomics to Sustainable Production, Quality and Health

VEGETATIVE GROWTH, CROPPING AND WINTER HARDINESS OF SELECTED RASPBERRY CULTIVARS AS AFFECTED BY PROCA
Authors:   P. Palonen, E. Pehkonen, M. Rantanen
Keywords:   crop potential, LT50, prohexadione-calcium, Rubus idaeus
DOI:   10.17660/ActaHortic.2009.838.16
Abstract:
To increase harvest index of red raspberry (Rubus idaeus L.) plants, there is a need to establish an appropriate balance between vegetative and generative growth. Therefore, the effect of single and repeated prohexadione-calcium (ProCa) treatments on vegetative growth and crop potential of the raspberry cultivars ‘Glen Ample’ and ‘Tulameen’ was studied. Furthermore, the effect of two or three ProCa treatments on winter hardiness of raspberry cultivars ‘Ottawa’ and ‘Muskoka’ was studied. Repeated ProCa applications were necessary to control growth of raspberry canes, as growth resumed already three to four weeks after the first application. The response was cultivar-dependent. Growth reduction was mainly due to shortening of the internodes. In cv. ‘Glen Ample’, repeated ProCa applications reduced number of flower buds and slightly delayed flowering. However, the total number of flowers per cane was not affected. In spite of reduced vegetative growth, advanced terminal bud set, and slightly increased carbohydrate concentrations in buds, ProCa treatments did not improve winter hardiness of raspberry plants. In conclusion, ProCa proved promising for growth control of biennial raspberry cultivars, as it reduced vegetative growth without affecting crop potential. However, further research is needed to optimize the timing of ProCa applications.