Abstract
Ethephon plus 2,4,5-TP stimulated color development and fruit softening of McIntosh (Malus sylvestris Mill.) apples after 7–10 days. Most of the large differences in fruit pressure observed 10 or more days after treatment were lost after 2 or 3 mo storage at 1 C. Analysis for residual ethephon indicated that its breakdown in McIntosh apples occurred at the same rate at room temperature, on the tree or in storage at 1 C. The rate of breakdown was rapid for the first 17 days but decreased to a much slower rate after 30 days. The lack of color response with ethephon and 2,4,5-TP in some seasons was attributed to factors other than a slow breakdown of ethephon in the fruit.
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