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ASEV Catalyst Report

Performance of Early Fruit-Zone Leaf Removal in Cabernet Sauvignon and Merlot in an Arid Climate

Michelle M. Moyer, Jensena M. Newhouse, Maria S. Mireles
Catalyst: Discovery into Practice November 2021 : catalyst.2021.21007; published ahead of print November 18, 2021 ; DOI: 10.5344/catalyst.2021.21007
Michelle M. Moyer
1Department of Horticulture, Washington State University Irrigated Agriculture Research and Extension Center, Prosser, WA 99350;
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  • For correspondence: michelle.moyer@wsu.edu
Jensena M. Newhouse
2Formerly Department of Horticulture, Washington State University Irrigated Agriculture Research and Extension Center, Prosser, WA 99350.
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Maria S. Mireles
1Department of Horticulture, Washington State University Irrigated Agriculture Research and Extension Center, Prosser, WA 99350;
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Summary

Goals: Our goals were to evaluate how the timing of early fruit zone leaf removal, done between prebloom and post-fruit set, influenced the risk of reduced fruit set, sunburn, and fruit quality in Vitis vinifera Cabernet Sauvignon and Merlot grown in the hot, arid, and irrigated region of eastern Washington State.

Key Findings:

  • Fruit set was reduced in Vitis vinifera Cabernet Sauvignon when fruit-zone leaf removal was completed during bloom. Prebloom and postbloom fruit-zone leaf removal did not reduce fruit set.

  • Sunburn occurred on fruit on the westside of the canopy in both V. vinifera Cabernet Sauvignon and Merlot. Sunburn severity increased with later-timed fruit-zone leaf removal. Overall, the maximum severity of sunburn was 15% of the cluster surface area.

  • Vintage had a greater effect on fruit quality than timing of leaf removal for both varieties. This emphasizes the need to make canopy management decisions that are informed by weather forecasts, to achieve desired management goals.

Impact and Significance: Early fruit-zone leaf removal was traditionally avoided in eastern Washington, in favor of completing the practice after berries have reached pea-size. The later timing of leaf removal, however, can result in sudden exposure of the fruit during the typically warmest and sunniest time of the growing season. Results from this study show that many of the assumed risks associated with early fruit-zone leaf removal, such as extreme reduction in fruit set and sunburn, are not fully realized. This means that early fruit-zone leaf removal could be adopted in this hot, arid climate without a high risk of reduction in fruit quantity or quality.

  • abiotic stress
  • anthocyanins
  • canopy management
  • fruit exposure
  • Received September 2021.
  • Revision received October 2021.
  • Accepted October 2021.

This is an open access article distributed under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

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Performance of Early Fruit-Zone Leaf Removal in Cabernet Sauvignon and Merlot in an Arid Climate
Michelle M. Moyer, Jensena M. Newhouse, Maria S. Mireles
Catalyst: Discovery into Practice  November 2021  catalyst.2021.21007;  published ahead of print November 18, 2021 ; DOI: 10.5344/catalyst.2021.21007

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Performance of Early Fruit-Zone Leaf Removal in Cabernet Sauvignon and Merlot in an Arid Climate
Michelle M. Moyer, Jensena M. Newhouse, Maria S. Mireles
Catalyst: Discovery into Practice  November 2021  catalyst.2021.21007;  published ahead of print November 18, 2021 ; DOI: 10.5344/catalyst.2021.21007
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