Thursday, January 2, 2020

Mapping Chlorpyrifos on California Wine Grapes: Where Are the 5 Percent?

California's state health officials map the pesticide data they collect from all agricultural enterprises throughout the year.

In 2017, growers applied chlorpyrifos on five percent of wine grape acreage in the state. Where are these growers concentrated? And what is the changing pattern of chlorpyrifos use on grape vines in California for the last 17 years?

It is worth mentioning that most of California's wines come from Central Valley vineyards, so when you're picking up a bottle of supermarket wine (unless it's organic or biodynamic), there's no way of knowing if it's grown with chlorpyrifos.

Read the companion post to find out what the chlorpyrifos ban on sales actually means in practice.


In 2017, growers applied 49,417 pounds to 26,340 acres of wine grape vines.

Here's a look at 2000, 2005, 2010, 2015 and 2017 chlorpyrifos use on wine grapes.



2005 Close Up of Napa & Sonoma Counties

The darkest red areas in the Carneros may be Laird Family holdings.


2010 Close Up of Napa & Sonoma Counties

In 2010, Napa growers applied 272 pounds of chlorpyrifos on 162 acres and Sonoma growers applied 123 pounds of it on 65 acres, according to the California Dept. of Pesticide Regulation.


2015 Close up of Napa and Sonoma Counties

The red square on the left might align with Gallo's Two Rock vineyard where chlorpyrifos was used on 400 acres.


2017 Close Up of Napa & Sonoma

There are red squares near Forestville and Petaluma that indicate some growers are using chlorpyrifos there. The pesticide use report would list their names and exact locations.

Want to know more? Check out the Agriculture Pesticide Mapping tool here.


Here's a look at the use of chlorpyrifos on all crops—it was applied to 650,000 acres of them—in California in 2017.

As you can see, it's favored by growers in the reddest part of the state—the area that Republican Congressman and Trump supporter Devin Nunes is from. In addition to using the most chlorpyifos, the area is also known for having severe groundwater pumping and subsidence problems and may be heavily impacted when new water control laws go into effect.


Interested in learning more? Check out the companion post on what the ban on sales actually means in practice.

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