Abstract
Timing and concentration of GA applications were evaluated for berry thinning and sizing on `Vanessa'. Mid-bloom applications at 0, 5, 10, 15, 20 and 30 ppm GA were tested for berry thinning. Post-bloom applications of 0, 25 and 50 ppm GA at 7, 12, 16 and 21 days past mid-bloom were tested for berry sizing. None of the mid-bloom (thinning) treatments significantly reduced the number of berries per cluster or cluster compactness. Mid-bloom applications at 15, 20 and 30 ppm GA significantly increased berry weight. Post-bloom (berry sizing) treatments significantly increased berry weight with each increase in GA concentration for each time of application. The number of berries per cluster was significantly increased by sizing sprays at 7 and 12 days, but not at 16 or 21 days past mid-bloom. Cluster weight was significantly increased by 25 and 50 ppm GA applied at 7, 12 and 16 days past mid-bloom. All post-bloom applications significantly reduced the number and weight of shot berries.
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