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Am. J. Enol. Vitic. 40:2:130-134 (1989)
Copyright © 1989 by the American Society for Enology and Viticulture.
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Influence of Leaf Area on Fruit Development and Quality of Italia Glasshouse Table Grapes

C. M. Kingston 1 and C. W. Van Epenhuijsen 1

1 MAFTech, Levin Horticultural Research Centre, Private Bag, Levin, New Zealand.

Restricting the leaf area providing photosynthates for each grape cluster reduced mean cluster weight through a reduction in mean berry weight. Berries from plants with reduced leaf area grew more slowly and never reached the size of berries from plants with higher leaf areas. Time taken to reach maturity (16° Brix) was also affected as plant leaf area decreased; accumulation of sugars and reduction in titratable acidity were retarded. Over one month's difference in picking date was recorded between the two extreme treatments. In this experiment, Italia grapes required between 7.2 cm2 and 9.5 cm2 of leaf area per gram of fruit to promote optimal ripening.

Key words: Italia grapes, ripening, leaf area, fruit development, fruit quality, glasshouse

Submitted on May 4, 1988






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Copyright © 1989 by the American Society for Enology and Viticulture.