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Questions arise as to what to do with the fruits of persimmon trees when they are severely defoliated by a typhoon early in the season. In this study, the leaves of 5-year-old, field-grown ‘Fuyu’ trees were defoliated 75% on Sept. 3, 1999 and Sept. 6, 2001. Zero (control), 25, 50, and 75% of their fruits were then thinned on these trees, changing the leaf-to-fruit ratio to about 5, 7, 10, and 20, respectively. The ratio of non-defoliated intact trees was maintained at 20 throughout the season. Fruit weight and color increased to the level of intact trees when fruit thinning exceeded 25%, although the leaf-to-fruit ratio was as low as 7. On the other hand, fruit soluble solids responded poorly to the increase in fruit thinning on defoliated trees; even a 75% thinning could not restore them to the level of intact trees. Results suggested that fruit thinning could improve fruit size and color, but have a limited impact in increasing fruit soluble solids when the trees had lost 75% of their leaves in early September. In the following year, measurements of shoot growth, leaf area, fruit set, and fruit characteristics did not show consistent differences attributable to the thinnings on 75%-defoliated trees the previous year.

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Abstract
Introduction
Materials and Methods
Results and Discussion
Literature Cited

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UCI(KEPA) : I410-ECN-0101-2009-525-016909170