Abstract
KGA<sub>3</sub> 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 KGA<sub>3</sub> at 25 ppm. Berry weight was increased by the KGA<sub>3</sub> treatments, but cluster weight was decreased at 25 ppm. Percent looseness was also increased by KGA<sub>3</sub> at 25 ppm. Application of KGA<sub>3</sub> 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 KGA<sub>3</sub>. Clusters dipped into KGA<sub>3</sub> at 10, 25, and 50 ppm became straggly. The °Brix increased in fruits treated with KGA<sub>3</sub> 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.
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