Abstract
Vines having the slight red-leaf condition in the late fall mature their fruit about 2 weeks earlier than vines having the severe red-leaf condition.
Vines in the intermediate red-leaf group mature their fruit at the same time as, or slightly later than, vines in the slight redleaf group, but not as late as vines in the severe red-leaf group.
Vein banding apparently does not affect fruit maturity, though it reduces yield slightly.
Vines having slight ned leaf produce an average of 5-8 lbs more fruit per vine than vines having severe red leaf. Vines having intermediate red leaf are intermediate in production.
Ruby Cabernet vines, having the slight red-leaf condition (with or without vein banding) did not develop over 3% red leaves throughout the season. Vines having the intermediate red-leaf condition developed red leaves about August and reached the intermediate red-leaf condition about the middle of October. Vines having a severe red-leaf condition developed red leaves at about the same time as the intermediate red-leaf group, but by the middle of October these vines had about 60% or more red leaves.
Wines made from vines having the severe red-leaf condition tended to be lower in alcohol, color, and tannin than wines made from vines having the slight red-leaf condition.
Sensory examinations by the taste panel could detect no differences in the quality of the wines made from the fruit of vines in the different leaf-color categories.
- Copyright 1963 by the American Society for Enology and Viticulture
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