Farming Sonoma vineyards organically

Farming Sonoma vineyards organically


Farming Sonoma vineyards organically is expensive and time consuming. And it makes the wine more expensive too. Why?

One of the biggest risks to vineyards around the globe is mold and mildew. Mildew spores over-winter in dormant cane buds and under bark. For season-long control, the vineyards must be sprayed. But with what?

Traditional farming deploys an array of chemicals to knock down mold and mildew. Examples include Tebuconazole, Triflumixole, and Quinoxyfen. To be effective, during the growing season chemicals like these will be sprayed on every inch of every grapevine roughly every 21 days.

Organic choices are more limited, and less effective, and sometimes more expensive too. And they must be applied every 10-14 days. Over the course of an entire growing season, that means 3-5 more trips through the vineyard with the driver, tractor, and sprayer, and nearly twice the total chemical cost. If you owned vineyards and you’re livelihood depended on growing and selling perfect grapes, which path would you choose?

At Hydeout Sonoma, we are sustainable always, and organic whenever possible. And our clients happily (or grudgingly) pay the extra costs – knowing their kids and pets can safely play in the vineyard and (the adults) can safely drink the wine.

In May, most grapes will look like this…

healthy grapes in June

Those same grapes grapes will look like this by late summer…

healthy grapes in July

but left untreated, by Fall those grapes will look like this, ruined…

powdery mildewed grapes in August

Mold and mildew must prevented early and all season (until the grapes start to color up or turn red, called verasion). Once you have it, no amount of irrigation or spraying will get you out of mildew trouble. 

An uninformed person might drive past one of our organic spray programs and get pretty nervous hearing all the noise and seeing the chemical fog. This is what fully organic spraying can look like from a distance…

organic spray by tractor

And up close…

organic spray by tractor close up

This week, we are spraying a combination of 3 organic products, all approved by OMRI (Organic Materials Review Institute).

OMRI is a non-profit that supports organic integrity by developing clear information and guidance about materials, so that producers know which products are appropriate for organic operations.

Organic spray materials

  • Sulfur 80: it’s just like what it sounds, basically naturally occurring sulfur in mineral form all crushed up, and then pulverized so that it will go into dispersable suspension with water,
  • Sonata: is a bio-fungicide with live bacteria spores that induce plants’ natural defenses to resist disease development and anti-fungal compounds that have contact fungicidal activity.
  • Syl-coat: is a nonionic surfactant which has been specifically designed to enhance the efficacy of pesticides. It is particularly effective when used with water-soluble mildewcides.

Along with managing organic pesticides, vineyard irrigation management is an equal challenge. Here is one sample image of how I manage our client’s vineyard irrigation from my cell phone.

irrigation status – cell phone

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