Abstract
ABSTRACT A pendulum impulse trunk shaker was compared to an inertial trunk shaker for harvesting semi-vigorous open-center and central-leader Mcintosh apple trees. The proportion of apple bruising resulting from detachment versus falling through the tree and under-tree catching indicates fifty percent of the total bruising and skin breakage occurred at the detachment area. There was no significant difference between the amount of bruising of apples harvested by the impulse trunk shaker and the inertial trunk shaker. Impulse trunk shaking caused more apples to be detached without stems than inertial trunk shaking. The mechanical harvesting of open-center and central leader trees, with the impulse or inertial trunk shaker, resulted in significantly lower apple bruising in the open-center trees than the central-leader trees.
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