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Research Article

Reducing the Economic Impact of Grapevine Leafroll Disease in California: Identifying Optimal Disease Management Strategies

Katie D. Ricketts, Miguel I. Gomez, Shady S. Atallah, Marc F. Fuchs, Timothy E. Martinson, Mark C. Battany, Larry J. Bettiga, Monica L. Cooper, Paul S. Verdegaal, Rhonda J. Smith
Am J Enol Vitic. May 2015 66: 138-147; published ahead of print January 30, 2015 ; DOI: 10.5344/ajev.2014.14106
Katie D. Ricketts
1Charles H. Dyson School of Applied Economics and Management, Cornell University, Ithaca, NY 14852
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  • For correspondence: KDR46@cornell.edu
Miguel I. Gomez
1Charles H. Dyson School of Applied Economics and Management, Cornell University, Ithaca, NY 14852
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Shady S. Atallah
1Charles H. Dyson School of Applied Economics and Management, Cornell University, Ithaca, NY 14852
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Marc F. Fuchs
2Department of Plant Pathology and Plant Microbe Biology, Cornell University, Geneva, NY 14456
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Timothy E. Martinson
3Department of Horticulture, New York State Agricultural Experiment Station, Cornell University, Geneva, NY 14456
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Mark C. Battany
4University of California Cooperative Extension, San Luis Obispo County, San Luis Obispo, CA 93401
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Larry J. Bettiga
5University of California Cooperative Extension, Monterey County, Salinas, CA 93901
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Monica L. Cooper
6University of California Cooperative Extension, Napa County, Napa, CA 94558
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Paul S. Verdegaal
7University of California Cooperative Extension, San Joaquin Valley, Stockton, CA 95206
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Rhonda J. Smith
8University of California Cooperative Extension, Sonoma County, Santa Rosa, CA 95403
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Abstract

Grapevine leafroll disease (GLRD) is a devastating viral disease found across all grapegrowing regions. Vineyard managers have adopted various strategies for managing GLRD, including roguing individual symptomatic vines and replacing them with certified vines derived from clean, virus-tested stocks; applying insecticides targeting mealybug vector populations to reduce disease spread and minimize long-term impacts; and fully replanting vineyards at the onset of disease symptoms. Moreover, some managers elect not to control GLRD at all. We collected survey data from vineyard managers throughout the three major California grapegrowing counties, Napa, Sonoma, and Northern San Joaquin Valley, to estimate the economic impact of GLRD on Cabernet Sauvignon vines. The goal was to identify cost-minimizing management strategies under various disease-prevalence levels, price penalties, timing of disease onset relative to vineyard age, yield losses, and costs of control. Our results estimated that the economic cost of GLRD ranged from $29,902 to $226,405 per ha. Roguing symptomatic vines and replanting with certified vines in combination with insecticides to reduce mealybugs may minimize losses if GLRD prevalence is low (between 5 and 10%), while a full vineyard replacement should be pursued if disease prevalence is higher, generally above 25%, although regional differences were noted. These findings should help vineyard managers in the three regions examined to adopt optimal GLRD management strategies that can be tailored regionally or locally to unique market opportunities, potential market prices, and annual operating costs.

  • grapevine leafroll disease
  • GLRD
  • Napa County
  • Sonoma County
  • Northern San Joaquin County
  • net present value
  • roguing
  • vine replacement
  • mealybugs
  • economic impact
  • Received September 2014.
  • Revision received January 2015.
  • Accepted January 2015.
  • ©2015 by the American Society for Enology and Viticulture
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Reducing the Economic Impact of Grapevine Leafroll Disease in California: Identifying Optimal Disease Management Strategies
Katie D. Ricketts, Miguel I. Gomez, Shady S. Atallah, Marc F. Fuchs, Timothy E. Martinson, Mark C. Battany, Larry J. Bettiga, Monica L. Cooper, Paul S. Verdegaal, Rhonda J. Smith
Am J Enol Vitic.  May 2015  66: 138-147;  published ahead of print January 30, 2015 ; DOI: 10.5344/ajev.2014.14106

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Reducing the Economic Impact of Grapevine Leafroll Disease in California: Identifying Optimal Disease Management Strategies
Katie D. Ricketts, Miguel I. Gomez, Shady S. Atallah, Marc F. Fuchs, Timothy E. Martinson, Mark C. Battany, Larry J. Bettiga, Monica L. Cooper, Paul S. Verdegaal, Rhonda J. Smith
Am J Enol Vitic.  May 2015  66: 138-147;  published ahead of print January 30, 2015 ; DOI: 10.5344/ajev.2014.14106
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