OFF-SEASON PRODUCTION OF PRIMOCANE-FRUITING RED RASPBERRY USING SUMMER PRUNING AND POLYETHYLENE TUNNELS

The spring shoots of 'Autumn Bliss' red raspberry (Rubus idaeus L. var , idaeus; primocane-fruiting type) were cut on 2, 16, 31 July and 15 a nd 30 Aug, with the objective of delaying fruit harvest into the off-s eason under mild winter climatic conditions, Cutting shoots in August delayed fruit harvest until February and April of the following year, but shoot growth was weak and fruit yield low (4.8 and 2.1 g/cane), Ju ly cuttings delayed harvest until October to January with acceptable f ruit yield (63.5, 52.8, and 26.5 g/cane for 2, 16, and 31 July, respec tively), The differences in cane height and total node and fruiting no de count between the three cutting dates of July were small, but there was a constant decrease in leaf area per cane from the first to the t hird date and a sharp decrease in fruit yield from the second to the t hird date. Vegetative shoot growth was less affected than yield when s ummer cutting was delayed until the end of July to induce a later harv est, Fruit quality always reached acceptable standards, This study con firms the practicability of using summer-cutting of primocane-fruiting red raspberries to induce off-season fruit production under protected cultivation in mild winter climates.