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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Production and Genetic Improvement Research Unit » Research » Publications at this Location » Publication #394629
Research Project: Improved Fruit, Grape and Wine Products through Precision Agriculture and Quality Component Evaluation

Location: Horticultural Crops Production and Genetic Improvement Research Unit

Title: Occurrence of grapevine-associated tymo-like virus in wine grapes in the United States

Author
item DAHAN, JENNIFER - University Of Idaho
item ORELLANA, GARDENIA - University Of Idaho
item Lee, Jungmin
item KARASEV, ALEXANDER - University Of Idaho

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/6/2022
Publication Date: 2/2/2023
Citation: Dahan, J., Orellana, G.E., Lee, J., Karasev, A.V. 2023. Occurrence of grapevine-associated tymo-like virus in wine grapes in the United States. Plant Disease. 107(2):592. https://doi.org/10.1094/PDIS-05-22-1140-PDN.
DOI: https://doi.org/10.1094/PDIS-05-22-1140-PDN

Interpretive Summary: This paper reports on the first identification of grapevine-associated tymo-like virus in Idaho, it is also the first account of this virus in United States. How this grapevine virus might alter grape quality is not yet known, so further study is required. While some grapevine viruses are detrimental to grapevine health, crop load ratio, fruit characteristics, and ultimately to wine quality, others cause only minor issues.

Technical Abstract: Wine grape production in Idaho occurs on approximately 1,300 acres (planted acreage), predominately Canyon County in the Southwest and Nez Perce County in the Northwest. A multiple year survey for emerging vine viruses was conducted on wine grapes grown in both of these counties. In September of 2020 and 2021, leaf and petiole samples from six cultivars were collected at vineyard sites in Canyon and Nez Perce counties. Samples were primarily selected based on visual symptoms of vine decline, grapevine leafroll disease (GLD), or other abnormalities. The presence of the grapevine-associated tymo-like virus (GaTLV) was confirmed by RT-PCR (reverse transcription polymerase chain reaction) in ten of 38 grapevine samples collected during study seasons. To the best of our knowledge, this is the first report of GaTLV in Idaho (GaTLV-ID), as well as the first confirmation of GaTLV’s presence in wine grapes within the United States.