ABSTRACT
Application of 150 or 300 ppm gibberellic acid (GA3) to ‘Venus’ table grapes 7 days after bloom resulted in reduced seed trace number but did not reduce individual seed trace weight. Neither berry nor cluster weight were affected by GA3, although a slight increase in yield was found in one of two years. Pre-bloom applications to ‘Venus’ produced no seed trace number or weight reductions, although a combined pre- and post-bloom treatment reduced seed trace weight significantly in one year. ‘Saturn’ had a slight reduction in seed trace number following a pre-bloom application one year, and a greater reduction was seen following application of pre- and post-bloom GA3 that same year. Post-bloom and combined applications during the following season gave similar reductions in seed trace number. Berry weight was increased for ‘Venus’ but not affected for ‘Saturn’ following the combined pre- and post-bloom applications.
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