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Article

Effect of Potassium Gibberellate on Fruit-Set and Development of Thompson Seedless and Zinfandel Grapes

Alberto Miele, Robert J. Weaver, Johnny Johnson
Am J Enol Vitic.  1978  29: 79-82  ; DOI: 10.5344/ajev.1978.29.2.79
Alberto Miele
Department of Viticulture and Enology, University of California, Davis 95616
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Robert J. Weaver
Department of Viticulture and Enology, University of California, Davis 95616
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Johnny Johnson
Department of Viticulture and Enology, University of California, Davis 95616
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Abstract

KGA3 applied to Thompson Seedless grapes when the flowers ranged from 30 to 80% bloom tended to increase the percentage of abscised ovaries, most of which were 1 mm or less in width. The percentage of berries set was decreased by KGA3 at 25 ppm. Berry weight was increased by the KGA3 treatments, but cluster weight was decreased at 25 ppm. Percent looseness was also increased by KGA3 at 25 ppm.

Application of KGA3 to Zinfandel grapes at pre-bloom caused a decrease in percentage of abscised ovaries, most 1 mm or less in width. There was a large increase in the percentage of ovaries that remained attached to the clusters, and a decrease in percentage of berries set. Weight per cluster and weight per berry both decreased. Elongation of clusters increased with higher concentrations of KGA3. Clusters dipped into KGA3 at 10, 25, and 50 ppm became straggly. The °Brix increased in fruits treated with KGA3 at 50 ppm. Total titratable acidity did not differ significantly among treatments.

The frequency distributions for Thompson Seedless and Zinfandel berry sizes were maximum for the class interval 12.0 to 13.9 mm wide.

  • Received December 1977.
  • Accepted January 1978.
  • Published online January 1978
  • Copyright 1978 by the American Society for Enology and Viticulture

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You have accessRestricted access
Effect of Potassium Gibberellate on Fruit-Set and Development of Thompson Seedless and Zinfandel Grapes
Alberto Miele, Robert J. Weaver, Johnny Johnson
Am J Enol Vitic.  1978  29: 79-82  ; DOI: 10.5344/ajev.1978.29.2.79
Alberto Miele
Department of Viticulture and Enology, University of California, Davis 95616
  • Find this author on Google Scholar
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Robert J. Weaver
Department of Viticulture and Enology, University of California, Davis 95616
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Johnny Johnson
Department of Viticulture and Enology, University of California, Davis 95616
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Effect of Potassium Gibberellate on Fruit-Set and Development of Thompson Seedless and Zinfandel Grapes
Alberto Miele, Robert J. Weaver, Johnny Johnson
Am J Enol Vitic.  1978  29: 79-82  ; DOI: 10.5344/ajev.1978.29.2.79
Alberto Miele
Department of Viticulture and Enology, University of California, Davis 95616
  • Find this author on Google Scholar
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Robert J. Weaver
Department of Viticulture and Enology, University of California, Davis 95616
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Johnny Johnson
Department of Viticulture and Enology, University of California, Davis 95616
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  • Search for this author on this site
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