EFFECT OF GROWTH RETARDANTS (CYCOCEL, DAMINOZIDE AND PACLOBUTRAZOL) ON GROWTH AND DEVELOPMENT OF RED RASPBERRIES, CV. AUTUMN BLISS, CULTIVATED UNDER PLASTIC GREENHOUSE CONDITIONS IN CHANIA-CRETE, GREECE

The effect of three growth retardants (cycocel, daminozide and paclobutrazol) on growth and development of “Autumn Bliss” fallbearing fruiting red raspberry, cultivated under greenhouse conditions in Crete, was studied.

Cycocel, 500 ppm, applied to the plants at the stage of 45-cm height reduced primocane height without reducing the number of nodes, enhanced anthesis and fruit ripening by about 10 days.
Yield was significantly increased by 90%, without affecting berry size, compared to the control or 100 ppm, while 1000, 2000 or 4000 ppm caused phytotoxicity.
Daminozide, 2000 ppm, was most effective when applied at 30-cm plant height, it enhanced anthesis and fruit ripening by 20 days, increased yield by 98%, however, it reduced fruit size by 7%.

Paclobutrazol 500 or 1000 ppm applied at 45- cm plant height induced earliness by 12 days and increased yield by 66%, while higher concentrations and /or double application caused excessive plant dwarfness.

XXV International Horticultural Congress, Part 3: Culture Techniques with Special Emphasis on Environmental Implications, Disease, Pest Control and Integrated Pest Strategies

Y. Ghora, M. Vasilakakis, G. Stavroulakis

https://doi.org/10.17660/ActaHortic.1998.513.54