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GA application to 9Golden Queen9 grape, a hybrid of Vitis vinifera and V. labrusca, at different stages of cluster development did not increase fruit set or cluster and berry weights. There was no effect on quality of the berries. Different growth substances, alone and in combinations, applied to emasculated clusters of Golden Queen grape did not induce parthenocarpy.
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Bedford et al. (1971) studied this question.