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D.C. Ferree, S.J. McArtney, and D.M. Scurlock

Vines of container grown `DeChaunac', `Vidal blanc', `Seyval blanc' and `Chambourcin' grapes were subjected to 5 days of 80% shade at prebloom, bloom or 2 and 4 weeks after bloom. Fruit set, cluster weight, berries per cluster and juice components [soluble solids concentration (SSC), pH and titratable acidity] of `DeChaunac' and `Vidal blanc' were not affected by a short period of intensive shade. `Chambourcin' was sensitive to a shade period near the time of bloom for most of the aforementioned factors, while `Seyval blanc' was intermediate in sensitivity. Shot (green, hard, and undersized) berries of `Chambourcin' and `Seyval blanc' were increased by a 5-day period of shade 2 or 4 weeks after bloom. In a second study, container-grown `Chambourcin' on 3309C (V. riparia × V. rupestris) with one or two clusters and `Vidal blanc' with one cluster were subjected to the following light regimes beginning at bloom for 5 weeks: supplemental light, ambient greenhouse light and 30%, 50% or 80% shade. Yield, fruit set, specific leaf weight (leaf dry weight/leaf area), saturation index, and total leaf chlorophyll increased linearly with increasing irradiance. `Chambourcin' juice pH, SSC, leaf chlorophyll a/b ratio, cluster color development and hue angle decreased as irradiance increased, likely related to crop reduction. Responses in `Vidal blanc' followed similar trends, but differences were not as great. Results demonstrate that light is an important determining factor in fruit set of French-American hybrid grapes and fruit set of some cultivars are sensitive to short periods of intense shade.

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D.C. Ferree, D.M. Scurlock, and J.C. Schmid

`Seyval blanc' and `Vidal blanc' grapevines (Vitis sp.) grown in large containers were root-pruned at different severities and/or stages of development and the effects on growth of both cultivars and fruiting of `Seyval blanc' were determined. As the severity of root pruning increased, stomatal conductance (g s) and transpiration (E) decreased and the number of wilted leaves increased in both cultivars. In both cultivars, root pruning reduced net photosynthesis (Pn) and E for as long as 18 to 20 days, as well as total leaf area and dry weight of leaves and petioles plus tendrils. The reductions were proportional to the degree of root pruning. A similar pattern existed for cane and root tissue of `Vidal blanc'. As the severity of root pruning increased, berry and cluster weight, and titratable acidity (TA) of `Seyval blanc' decreased. There was no effect of root pruning on berries per cluster, soluble solids content (SSC), or pH of the juice. No interaction was significant for any factor between time of root pruning and fruiting measured on `Seyval blanc' vines. Root pruning at bloom reduced leaf area, number of leaves, and dry weight of petioles, trunks, and canes. Root pruning at veraison had no effect on any vegetative or fruit parameters. Fruiting `Seyval blanc' vines had less leaf area and smaller petiole and cane dry weights than did nonfruiting vines.

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Nagehan D. Köycü, John E. Stenger, and Harlene M. Hatterman-Valenti

using the formula: where n = number of injured leaves in each severity category, and v = percentage values of each severity category, and N = total number of leaves observed. Yield characteristics. Yield (kilograms per plant) and cluster weight (grams

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Justin Morris, Gary Main, Renee Threlfall, and Keith Striegler

). Minimal pruning with and without skirting of ‘Chancellor’ grapevines resulted in higher yields than hand pruning, but with lower cluster weights, fewer berries per cluster, lower berry weight, and lower grape soluble solids ( Reynolds and Wardle, 2001

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Imed Dami, Said Ennahli, and David Scurlock

higher cluster number than that of CT40 in 4 of 5 years ( Table 1 ; Fig. 1A ). The 5-year mean of clusters per vine in the CT60 was 28% higher than that in CT40. As a result, the 5-year mean crop weight in CT60 was 13% higher, but cluster weight was 14

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Annie R. Vogel, Rachael S. White, Clark MacAllister, and Cain C. Hickey

was recorded. Average cluster weight was determined as the quotient of crop weight and cluster number per vine. Immediately before harvest on 21 Aug. 2017 and 29 Aug. 2018, a random, composite berry sample of 120 berries, taken equally from both canopy

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Paolo Sabbatini and G. Stanley Howell

-cropping cultivar, Sangiovese ( Vitis vinifera L.). Cluster weight was reduced, whereas most soluble solids (Brix) and total anthocyanins were increased. These data indicated that early mechanical defoliation is a viable crop adjustment tool and delivers most of

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Bryan Hed and Michela Centinari

per inflorescence, expressed as the ratio between number of flowers before and after MD-I, averaged to 9%. Yield parameters, cluster morphology, bunch rot, and fruit composition . In both years, yield and cluster weight of defoliated vines were lower

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Andrew G. Reynolds, Amal Ehtaiwesh, and Christiane de Savigny

per vine was determined as grapes were harvested. Cluster weight was calculated from yield per vine and clusters per vine data. Berries per cluster were estimated from cluster weight and berry weight data. Weight of cane prunings (vine size) was

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James A. Schrader, Diana R. Cochran, Paul A. Domoto, and Gail R. Nonnecke

advanced selections in this study, and we use the term “northern hybrids” to represent the 12 cold-climate cultivars that we evaluated. Yield per hectare, yield per vine, cluster number, cluster weight, and pruning weight were used to characterize annual