Portugal stopped Port fraud by uprooting elderberry trees

By the 1750s, Port wine's reputation in the lucrative English market was collapsing under fraud. As English demand for darker, richer Port outran what the Douro's vineyards could honestly supply, producers across the region began doctoring thin, pale wine with elderberry juice (baga) and grape skins to fake the color and body buyers expected, and adding sugar and cheap brandy to mask the deception further.

Punishing individual adulterators after the fact was the standard tool, and it was hopeless at this scale: thousands of scattered small growers up and down the river, no reliable way to test a bottle's actual contents, and every incentive on the producer's side to keep faking a product buyers couldn't verify. Chasing bottles one at a time could never keep up with a fraud that could be committed by anyone with access to an elderberry tree.

Uprooted elderberry trees, the fraud's raw material, making adulteration costly and risky, while boundary markers and a monopoly closed the market to outsiders.

Elderberry juice was the one ingredient every adulterator needed, and it came from trees in a specific, findable place.

Removing the trees eliminated the fraud's input at a single fixed point, rather than chasing every doctored bottle.

Without local elderberries, adulterators had to import the juice at higher cost and risk, making the fraud uneconomical.

Boundary markers and the export monopoly closed the gap, so even if a producer found another adulterant, they lost the market.

When fraud is too dispersed to police at the point of sale, attack its essential raw material at the source.

The measures were enforced harshly — reports describe growers exiled to Africa and India, others heavily fined, and warehouses suspected of aiding adulteration demolished — but they worked: Port's reputation in the English market stabilized within Pombal's lifetime, and the demarcated boundary the Company enforced is recognized as the world's first legally defined and regulated wine appellation, a model later copied by Champagne, Chianti, and every subsequent protected-designation wine region.