Abstract
Abstract The effect of the frequency of machine harvesting on the yield of red raspberry (Rubus idaeus L. cv. Skeena) was investigated using a finger-drum harvester. Yields from machine-harvested plots were compared with those from carefully hand-harvested plots to determine machine efficiency. With a 2-day harvest interval, 68% of potential yield was recovered by the machine. Increasing the interval between harvests to 4 or 6 days significantly reduced yield. Major sources of yield loss were fruit loss to the ground during harvest, green fruit removal — either individually or attached to laterals broken by the machine — and lower mean berry weight of machine-harvested fruit. Machine-harvested fruit was riper (lower in acidity) than handpicked fruit.
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