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ARS Home » Pacific West Area » Davis, California » Crops Pathology and Genetics Research » Research » Research Project #438762

Research Project: Impact of Wildfire Smoke Taint and Key Trunk Pathogens on Grapevine Wood and Grape Chemistry

Location: Crops Pathology and Genetics Research

Project Number: 2032-21220-008-034-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Sep 1, 2020
End Date: Aug 31, 2023

1. Develop analytical methods for accurate quantitation of smoke exposure in winegrapes impacted by wildfires. 2. Determine the relationship between localized and systemic responses to trunk diseases, based on phenolic concentrations in the wood and in the fruit, respectively. 3. Characterize chemical profiles in grape juice and wine from healthy versus symptomatic vines in vineyards impacted by trunk diseases.

Sampling methods will be developed in the field for grapes impacted by wildfire smoke and trunk diseases. The timing of sampling, distribution of vines and numbers of clusters sampled throughout the vineyard, and the storage of such samples prior to laboratory analyses are all important research questions to address before methods development in the lab. As such, we will identify sites impacted by wildfires and trunk diseases, and sample at various stages of ripeness. In the laboratory, phenolic profiles will be examined by GS-MS. A focus on different grape cultivars will help determine if juice and wine quality are impacted similarly.