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. 2022 Jun 21;14(7):1348. doi: 10.3390/v14071348

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Visual identification of grapevine leafroll-associated virus 3 (GLRaV-3) genotypes at the Hawke’s Bay site for the red-berry cultivars Merlot (left panel) and Pinot noir (right panel) in vintages 2015, 2016, and 2017. Generally, in all vintages, delayed symptom expression was observed for Merlot and Pinot noir (especially in vintages 2016, 2017) infected with Group X (diamond points) relative to Group I (star points) and Group VI (triangle points) virus infections. This reduced the overall percentage of GLRaV-3-infected vines positively identified by foliar symptoms, with the exception of vintage 2015, where the percentage of Group X-infected Pinot noir vines positively identified for disease based on foliar symptoms was greater than that for Group VI in the same cultivar.