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Article

Effect of Pruning on Recovery and Productivity of Cold-Injured Merlot Grapevines

Markus Keller, Lynn J. Mills
Am J Enol Vitic.  2007  58: 351-357  ; DOI: 10.5344/ajev.2007.58.3.351
Markus Keller
1Associate professor, 2Research technology supervisor, Department of Horticulture and Landscape Architecture, Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350.
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  • For correspondence: mkeller@wsu.edu
Lynn J. Mills
1Associate professor, 2Research technology supervisor, Department of Horticulture and Landscape Architecture, Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350.
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Abstract

A field experiment was conducted to determine effects of pruning time and bud number on vine recovery and performance following cold injury to trunk tissues. Own-rooted Merlot grapevines planted in 1999 and trained to a bilateral cordon with vertical shoot-positioning were pruned in 2003 and 2004 as follows: prebudbreak spur pruning, postbudbreak spur pruning, prebudbreak spur pruning with late repruning (double pruning), minimal pruning, and minimal pruning with disbudding of all nodes. On average, 25% of buds were killed by cold temperatures in late fall. Trunk injury, rated as tissue browning on adjacent vines, varied from 20 to 100% phloem injury with little xylem injury. Phloem injury had virtually no effect on budbreak, growth, fruiting, and fruit composition in the two following seasons. Differences in bud number per vine due to pruning treatment led primarily to equivalent differences in shoot numbers, cluster numbers, and yield. Minimal pruning resulted in the highest yield in both seasons, while double pruning and disbudding resulted in the lowest, but even disbudded vines grew fruitful shoots from basal and latent buds. Overall yields were low and fruit composition was unaffected by the pruning treatment, although soluble solids was negatively correlated with yield. Despite the two warm seasons, most of the vines, including those with high shoot and cluster numbers, did not collapse later in the season. Results indicate that pruning time and bud number did not influence vine survival and recovery from cold injury and had little effect on subsequent growth and vine performance.

  • Vitis vinifera
  • cold hardiness
  • cold injury
  • minimal pruning
  • yield
  • Received November 2006.
  • Revision received April 2007.
  • Copyright © 2007 by the American Society for Enology and Viticulture
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Effect of Pruning on Recovery and Productivity of Cold-Injured Merlot Grapevines
Markus Keller, Lynn J. Mills
Am J Enol Vitic.  2007  58: 351-357  ; DOI: 10.5344/ajev.2007.58.3.351
Markus Keller
1Associate professor, 2Research technology supervisor, Department of Horticulture and Landscape Architecture, Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350.
  • Find this author on Google Scholar
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  • For correspondence: mkeller@wsu.edu
Lynn J. Mills
1Associate professor, 2Research technology supervisor, Department of Horticulture and Landscape Architecture, Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350.
  • Find this author on Google Scholar
  • Find this author on PubMed
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Effect of Pruning on Recovery and Productivity of Cold-Injured Merlot Grapevines
Markus Keller, Lynn J. Mills
Am J Enol Vitic.  2007  58: 351-357  ; DOI: 10.5344/ajev.2007.58.3.351
Markus Keller
1Associate professor, 2Research technology supervisor, Department of Horticulture and Landscape Architecture, Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: mkeller@wsu.edu
Lynn J. Mills
1Associate professor, 2Research technology supervisor, Department of Horticulture and Landscape Architecture, Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
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