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Research Article

Identification of Potential Grapevine Red Blotch Virus Vector in Missouri vineyards

Harper F. LaFond, Dean S. Volenberg, James E. Schoelz, Deborah L. Finke
Am J Enol Vitic. May 2022 : ajev.2022.21056; published ahead of print May 20, 2022 ; DOI: 10.5344/ajev.2022.21056
Harper F. LaFond
1Division of Plant Science & Technology, University of Missouri, Columbia, MO 65211-7310, U.S.A. Grape and Wine Institute, University of Missouri, Columbia, MO 65211-7310, U.S.A.
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  • For correspondence: hfs5h4@missouri.edu
Dean S. Volenberg
1Division of Plant Science & Technology, University of Missouri, Columbia, MO 65211-7310, U.S.A. Grape and Wine Institute, University of Missouri, Columbia, MO 65211-7310, U.S.A.
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James E. Schoelz
1Division of Plant Science & Technology, University of Missouri, Columbia, MO 65211-7310, U.S.A. Grape and Wine Institute, University of Missouri, Columbia, MO 65211-7310, U.S.A.
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Deborah L. Finke
1Division of Plant Science & Technology, University of Missouri, Columbia, MO 65211-7310, U.S.A. Grape and Wine Institute, University of Missouri, Columbia, MO 65211-7310, U.S.A.
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Abstract

Grapevine red blotch virus (GRBV), the causal agent of Grapevine red blotch disease, was recently detected in vineyards across the United States and throughout Missouri. Insect transmission of GRBV in cultivated vineyards of Missouri had not been investigated prior to this research. The objectives of this study were to characterize the potential insect vectors present in four commercial vineyards that had previously been determined to be infected with GRBV, test potential vectors caught in vineyards and surrounding habitats for the presence of GRBV with the use of PCR, and investigate the ability of candidate vectors to acquire and transmit GRBV in controlled greenhouse experiments. Of the vineyard collected insects tested over the course of this research, one species of the treehopper Entylia carinata, tested positive for GRBV. This species and one other treehopper, Enchenopa binotata, were selected for direct transmission assays. Both species successfully acquired GRBV from infected grapevines and transmitted GRBV to confirmed GRBV-free grapevines. Entylia carinata has been identified as a promising economic vector after insect samples from vineyards tested positive for GRBV, and the monitoring data revealed this species as the second most abundant treehopper captured in traps. We do not consider E. binotata to be a likely economically significant vector because our monitoring data showed that this species was rare and only found along edge habitat surrounding vineyards, never inside vineyard rows. Samples of the most abundant treehopper, Micrutalis calva, have not tested positive but the vector status remains unresolved. Further research on rates of secondary spread and transmission by M. calva are required, but these results provide evidence that insect transmission of GRBV is feasible in the region.

  • grapevine red blotch disease
  • insect transmission
  • PCR detection
  • virus
  • Received December 2021.
  • Revision received March 2022.
  • Revision received April 2022.
  • Accepted May 2022.
  • Copyright © 2022 by the American Society for Enology and Viticulture. All rights reserved.

This is an open access article distributed under the CC BY license 24 (https://creativecommons.org/licenses/by/4.0/).

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Open Access
Identification of Potential Grapevine Red Blotch Virus Vector in Missouri vineyards
Harper F. LaFond, Dean S. Volenberg, James E. Schoelz, Deborah L. Finke
Am J Enol Vitic.  May 2022  ajev.2022.21056;  published ahead of print May 20, 2022 ; DOI: 10.5344/ajev.2022.21056

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Identification of Potential Grapevine Red Blotch Virus Vector in Missouri vineyards
Harper F. LaFond, Dean S. Volenberg, James E. Schoelz, Deborah L. Finke
Am J Enol Vitic.  May 2022  ajev.2022.21056;  published ahead of print May 20, 2022 ; DOI: 10.5344/ajev.2022.21056
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