Abstract
Girdling, growth retardant succinic acid 2-2-dimethyl hydrazide (Alar), 2-naphthoxyacetic acid (NOA), and Gibberellic acid (GA 3) were tested as a fruit-setting agent in 1975 for ‘Yaghooti’, a stenospermocarpic cultivar of Vitis vinifera grape. Bloom Alar spray at 7500 p.p.m. increased the number of berries per cluster and the cluster weight. Bloom auxin spray did not effectively increase fruit set, while gibberellin had a depressing effect. Girdling also increased fruit set and a combination of Alar and girdling had the most pronounced effect on fruit set. None of the treatments significantly altered soluble solids and/or vitamin C content of the berries.
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