This episode features a conversation with Adam Tolmach of Ojai Vineyards, and it’s located not too far from Los Angeles in distance. Adam Tolmach lost his estate vineyard a couple decades ago to a vine disease that is endemic to Southern California. This disease has become a serious problem for anywhere in North America that has mild enough winters… and that area is steadily creeping north. This vine disease is known as Pierce's Disease, it is spread by insects… specifically sharpshooters, and as Adam suggests, it was the cause of the death of tens of thousands of acres of vineyards in Southern California, and likely contributed to the contraction of the wine industry here and its move to Northern California by the end of the 19th century.  

There are currently only two options for preventing your vineyard from succumbing to Pierce's Disease if you live in an area that has it, which is pretty much the entire Southern United States: you can either spray aggressively with knock-down insecticides – the intense, kill-on-contact kind – OR you can plant varieties of grapes that have inherent resistance to the disease… and those varieties of grapes are the kind that contain the genetics of the native vines that evolved with the disease. In other words, you need hybrids. There are no vinifera varieties that are resistant to Pierce's Disease.

So, in 2017, Adam resurrected his estate vineyard by planting a selection of modern hybrid grapes that were bred here in California specifically to be resistant to Pierce's Disease. There are so many really incredible discussion points that come up in this conversation, but I wanted to give some further context to this.

Nothing illustrates the truth that hybrids are the future of wine more than this disease. With climate change, the range of this disease is continually spreading further north. It is on the doorstep of 90% of the winemaking in the US, and it knocking louder every year. It was recently found in Humbolt County, which is almost to California’s northern border. It is a zero tolerance disease… as Adam says, one bite from an insect that carries the disease can kill that vine within about 3 years. So the choices are pretty stark about what you can do to deal with it: either A) cling to vinifera and nuke your vineyards with really awful chemical insecticides continually, essentially creating a dead zone around your vines, or B) adapt and embrace change and build a wine culture ecologically on a greater diversity of varieties.

As I began researching for this conversation with Adam Tolmach, I discovered that there are quite a few vineyards who have planted small amounts of the resistant varieties that Adam grows. Even Caymus in Napa Valley. Nobody is really publicizing it yet, but hybrids are being integrated quietly, almost surreptitiously into our wine culture here. We’re in the don’t ask, don’t tell phase with regard to hybrids in California. Someday soon, we’re just going to have to grow up and embrace them as equals. And I’m really grateful to Adam for being one of the folks who’s willing to champion them.

https://ojaivineyard.com/

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