Watercore Development in Apple Fruits as Related to Sorbitol Levels in the Tree Sap and to Minimum Temperatures1

Abstract
In 3 different seasons watercore began to develop in ‘Delicious’ fruit as the minimum temperatures dropped to near 4°C. In 1970 and 1971 watercore started to appear just before a sharp rise in sorbitol level occurred in the limb sap. In 1972 considerable watercore developed in the fruit before a significant increase in sorbitol was observed in the sap.

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