Napa red blotch research gets a $2.5 million grower pledge
Wineries including Opus One and Dominus Estate are funding three years of work on a vine virus that has no cure. The first calls for proposals open in January 2027.
Growers and wineries in Napa Valley have pledged $2.5 million to fund red blotch research, opening a three-year first phase of the Grapevine Red Blotch Virus Research Initiative, announced on 6 October.
The money is private. The release names Christian Moueix of Dominus Estate, Opus One Winery, Joseph Phelps Vineyards, Darioush Winery, Joe Wender and Ann Colgin, Tom Gamble of Gamble Estates, Vine Hill Ranch, Laelius Winegrowing, Silverado Farming Company and the Araujo family among the backers. No trade body or public agency appears on the list.
No single laboratory receives the cheque. The American Vineyard Foundation is to act as fiscal agent and administrator, under agreements the initiative says are still being completed, and grants will go out through competitive calls. A proposed ten-member governance committee, split evenly between wine and research, sets budgets and makes the final decisions; an independent panel scores each proposal first.
With no cure for red blotch, Napa's growers are paying for the research themselves.
According to the organisers, the effort began in 2025 with talks convened by Moët Hennessy's Robert-Jean de Vogüé Research Center. It lands a week after Napa's 2026 harvest came in short.
What red blotch does to a vineyard
The disease was first noticed in 2007 at the UC Davis research station in Oakville, Napa Valley, and the virus behind it was not identified until 2012, according to the university. Infected vines give smaller fruit that ripens slowly, with muted sugar and colour.
There is no cure for red blotch. UC Davis describes the only treatment as pulling out the vine. In 2016 researchers showed that an insect, the three-cornered alfalfa hopper, carries the virus, and said it may not be the only one. The disease has also been detected in Oregon and New York.
The red blotch cost figure most often cited comes from a 2017 study in the American Journal of Enology and Viticulture: between $2,213 a hectare in eastern Washington and $68,548 a hectare in Napa County over a vineyard's 25-year life.
Red blotch research calls open in January 2027
The first calls for proposals are due in January 2027, with funding decisions in the spring. They cover four areas: earlier and more reliable detection, the biology of the virus and its vectors, vineyard management to limit spread, and nursery testing for clean plant material.
Ben Montpetit, who chairs the Department of Viticulture and Enology at UC Davis, said in the release that researchers and industry had jointly identified the most urgent needs, and that the aim was “practical tools that growers can use”.
Fundraising continues for later phases. Scale is the open question: by the 2017 study's upper estimate, $2.5 million matches the lifetime loss on roughly 36 hectares of Napa vineyard.
