Photo: John Volpe.
Master’s student Andrew Watts records data at Unsworth Vineyard in August.
A B.C. researcher says he can help the wine industry withstand climate change by testing exactly when grapes are at their peak for picking.
A two-year study led by University of Victoria ecologist John Volpe has the potential to transform the wine industry on the west coast, the school said Monday.
At a time when climate change is threatening other winemaking regions around the world, “combining innovative spectrometry technology with field manipulations at three B.C. vineyards will pinpoint the perfect time to harvest grapes,” says Volpe.
“The novelty of our approach stems from the use of a specific type of molecular analysis to assess the effect of our field manipulations,” says Volpe, whose research interests include ecology, biodiversity, gastronomy, sustainability and food production.
“We expect to gain insights on how to make great wine at a resolution never before available, and it will help growers harvest with confidence that their produce is in peak state to produce the best wines possible.”
Wine quality is assured by harvesting exactly when molecules responsible for aroma and flavor are at maximum density; this peak is called physiological ripeness and occurs only briefly.
Vineyards, in choosing when to harvest, use a “best guess” approach by testing sugar ripeness, which is easily measured in the field, Volpe says.
The new study proposes to identify markers of physiological ripeness instead.
The approach also involves minimal intervention on the vine, which will allow the wine to most closely reflect the ecosystem in which the grapes were grown.
“It matters entirely what’s in the vineyard if we want to allow the best expression of the land—the ‘placyness’ or terroir—in the wine,” adds Volpe, a certified sommelier.
The field work will be conducted at Blue Grouse Estate Winery in Duncan, and Unsworth Vineyards and Enrico Winery in the Cowichan Valley, using pinot gris, the single most popular varietal for wine in B.C.
The research findings will offer value to growers and winemakers across the province.
“This is an exciting opportunity to bring scientific rigour and analysis to measuring ripeness parameters and to learn how they vary with viticulture practices,” says Lamont Brooks, a UVic graduate and president of the Wine Islands Growers Association (WIGA).
“This important new knowledge will allow our winery businesses to continue to produce and improve the crisp aromatic wines so characteristic of our growing area.”
The researchers will also be testing the use of kaolin (a type of clay) as a new method of boosting grape quality, which has not yet been systematically examined in North America.
Volpe expects to present preliminary findings next spring, with the study wrapping up in 2020.
Funding was provided by WIGA via the Investment Agriculture Foundation of B.C.
For more info, visit uvic.ca/news.
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