Abstract
ABSTRACT MECHANICAL shake-and-catch harvesting systems that are now commonly used for cherry harvesting sometimes damage the bark on the tree trunk where the shaker is attached. Repeated damage, year-after-year, appears to contribute to tree decline and shortened orchard life. Special instrumentation was developed to obtain measurements of the failure strength of the bark and the stress applied to the bark by the shaker clamp-pad system. These values were used in the redesign of the clamp-pad system and to change harvesting procedures. Growers reported less damage to the tree trunk with little or no loss in harvesting efficiency. The design and use of the instrumentation, and typical results obtained, are discussed.
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