Abstract
Abstract ‘Black Corinth’ clusters at different stages of development were dipped into 25 ppm potassium gibberellate (KGA3). The most compact clusters resulted from treatment at 75% capfall or at succeeding applications up to 2 weeks after bloom. Most reduction in number of berries occurred at beginning of capfall and at 25% capfall. Berries treated between initiation of capfall and 1 week after full bloom were elongated while treatment at earlier or later stages resulted in round berries. The length-to-diameter ratio was greatest at 95% capfall and 3 days after full bloom. Clusters were treated with KGA3 at 0, 1, 2, 4, 6, 10, 20, 60, or 100 ppm at 75% capfall, 3 days, or 1 week after full bloom. At the 75% capfall stage, looseness and number of berries was decreased by KGA3 at 100 ppm Berry wt and vol were increased as compared to controls by all concn of KGA3 above 2 ppm. Length, diameter, and the length-to-diameter ratio generally increased progressively as the concn of KGA3 increased.
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