Abstract:Balanced, dormant hand pruning was compared with minimal and machine box-cut pruning with no fruit thinning, thinning at 27 to 45 days postbloom, or thinning at veraison on Vitis labruscana grape cultivars, Concord and Sunbelt. Weekly berry weights measured during the growing season showed that minimally pruned ‘Concord’ and ‘Sunbelt’ generally had lower berry weights than hand-pruned vines. Lag phase occurred 50 ± 7 days postbloom in ‘Concord’ and 58 ± 7 days postbloom in ‘S… Show more
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