Abstract
Trunk shakers use multidirectional shaking patterns to remove oranges from trees. Bark slippage has been aproblem on some of the more susceptible orange trees using these patterns. A linear shaking pattern offered potential forreducing bark damage (slippage) but its effect on fruit removal performance was unknown. Three field experiments wereconducted in matureHamlin orange trees to measure the fruit removal performance of multidirectional and linear shakingpatterns. An abscission chemical was applied in two of the experiments to reduce the fruit detachment force of the oranges.The linear shaking pattern removed 1 to 6 percentage points more oranges than did the multidirectional shaking pattern witha 6 to 7cm displacement at 7Hz frequency and a shaking time of 5 to 10 s/tree.
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