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Research Article

Heterogeneous Benefits of Virus Screening for Grapevines in California

Ji Yeon Cheon, Marieke Fenton, Emma Gjerdseth, Qian Wang, Siwei Gao, Hannah Krovetz, Lucy Lu, Lee Shim, Nicholas Williams, Travis J. Lybbert
Am J Enol Vitic. April 2020 : ajev.2020.19047; published ahead of print April 29, 2020 ; DOI: 10.5344/ajev.2020.19047
Ji Yeon Cheon
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
2Co-authors who share seniority of authorship
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Marieke Fenton
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
2Co-authors who share seniority of authorship
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Emma Gjerdseth
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
2Co-authors who share seniority of authorship
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Qian Wang
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
2Co-authors who share seniority of authorship
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Siwei Gao
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
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Hannah Krovetz
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
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Lucy Lu
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
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Lee Shim
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
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Nicholas Williams
1Graduate student, Agricultural and Resource Economics Department, University of California, Davis
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Travis J. Lybbert
3Professor of Agricultural and Resource Economics, University of California, Davis, and member of the Giannini Foundation of Agricultural Economics
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  • For correspondence: tlybbert@ucdavis.edu
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Abstract

The economic losses due to grapevine leafroll virus (GLRaV-3) are substantial and vary significantly across Californian grape regions. We expand a published economic model designed to estimate the losses associated with GLRaV-3 to accommodate the varied production and market conditions that prevail across these regions. This expanded model provides the basis for assessing the value of screening grapevines for GLRaV-3 across the heterogeneous production conditions that prevail in California, which may have important distributional effects in the industry with implications for producers, consumers and other stakeholders. We estimate that the total potential value of virus screening statewide is roughly $90 million per year, or 1.6% of the estimate $5.5 billion annual value of production of the California grape industry. Nearly 80% of this accrues to regions outside the high value North Coast wine grape region. The value of screening varies by region and grape type and according to disease management practices with the highest value accruing to table grapes in the South Valley region and white wine grapes in the Central Coast region. We estimate that growers could pay between $3 and $12 per vine for virus screening at establishment, which is higher than the current market price of most vines, and still break even. Because nurseries providing screened vines have captured only a fraction of this value through higher vine prices, the vast majority has gone to growers and ultimately, through lower retail prices for grapes and wine, consumers. The substantial investments in screening capacity in both the private and public sector will likely generate benefits for years to come.

  • benefit-cost analysis
  • disease management
  • economics
  • GLRaV-3
  • grapevine leafroll
  • virus screening
  • Received May 2019.
  • Revision received November 2019.
  • Revision received March 2020.
  • Accepted March 2020.
  • ©2020 by the American Society for Enology and Viticulture

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Heterogeneous Benefits of Virus Screening for Grapevines in California
Ji Yeon Cheon, Marieke Fenton, Emma Gjerdseth, Qian Wang, Siwei Gao, Hannah Krovetz, Lucy Lu, Lee Shim, Nicholas Williams, Travis J. Lybbert
Am J Enol Vitic.  April 2020  ajev.2020.19047;  published ahead of print April 29, 2020 ; DOI: 10.5344/ajev.2020.19047

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Heterogeneous Benefits of Virus Screening for Grapevines in California
Ji Yeon Cheon, Marieke Fenton, Emma Gjerdseth, Qian Wang, Siwei Gao, Hannah Krovetz, Lucy Lu, Lee Shim, Nicholas Williams, Travis J. Lybbert
Am J Enol Vitic.  April 2020  ajev.2020.19047;  published ahead of print April 29, 2020 ; DOI: 10.5344/ajev.2020.19047
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