How phylloxera helped Scotch whisky
In the second half of the nineteenth century a tiny insect called phylloxera destroyed much of Europe's wine industry. Cognac ran short. Blended Scotch, freshly made possible by the column still, stepped into the gap. Here is the story and the parts of it that are often exaggerated.
Phylloxera is a tiny insect that eats vine roots
Phylloxera is an aphid-like insect, less than a millimetre long, native to North America. It feeds on the roots of grapevines. American vines evolved alongside it and can tolerate the damage. European wine grapes, the species Vitis vinifera, cannot. The insect causes swellings on the roots, the roots rot and the vine dies within a few years.
It reached Europe in the mid nineteenth century, almost certainly on American vines brought over for study or for grafting. Steamships made the crossing fast enough for the insects to survive. It was first identified in French vineyards in the 1860s.
France lost much of its vineyard area
Over the next three decades phylloxera spread through France and then most of Europe's wine regions. Growers tried flooding vineyards and injecting chemicals into the soil. Very little worked. A large share of France's vineyards was destroyed in the 1870s and 1880s.
The Cognac region in western France was hit hard. Cognac is brandy distilled from wine, so when the vines died, the wine and then the brandy disappeared. Stocks already ageing in casks lasted a while, then ran short and prices rose.
British drinkers lost their brandy and soda
In Victorian Britain, brandy was the respectable spirit of the middle and upper classes. Brandy and soda was a fashionable drink. As cognac became scarce and expensive, those drinkers needed something else.
Blended Scotch was well placed to fill the gap. Column stills, patented by Aeneas Coffey in 1830, made light grain whisky cheaply. Mixed with a smaller share of malt whisky, it gave a smoother, more consistent spirit than the heavy pot still malts of earlier decades. Whisky and soda took over from brandy and soda. Our guide on how the Coffey still changed whisky covers why that blended style suited the moment.
Blending houses and railways did the rest
Phylloxera opened a door. Scottish merchants walked through it. Grocers and wine merchants in Scotland became blenders, building brands that tasted the same bottle after bottle. Railways moved whisky from the distilleries to the ports and cities. Bottling and branding meant drinkers could ask for a name rather than whatever was in the merchant's cask.
It is worth being careful here. Phylloxera did not create blended Scotch. Scotch would probably have grown anyway. The story often told, that whisky only won because brandy vanished, is too neat. A fairer version is that phylloxera arrived at exactly the moment Scotch had the product, the distribution and the marketing to take advantage of it.
Some vineyards escaped and most did not
Phylloxera struggles in very sandy soils, so a few vineyards on sand survived on their own roots. Some countries were spared for geographical reasons. Chile, protected by the Andes, the Pacific and the Atacama desert, is famous for vineyards that have never had to graft. Parts of Australia have kept the insect out with strict quarantine rules on moving vines and machinery.
Everywhere else, rootstocks became normal. Many Indian vineyards, in Nashik and elsewhere, are also planted on rootstocks, chosen there mainly for vigour and tolerance of drought and salty soil rather than for phylloxera. So the same Victorian crisis that helped Scotch into British glasses still shapes how grapes are grown in Maharashtra and Karnataka. Brewers will recognise the logic: when a crop is threatened, you change the part of the plant you cannot see.
The boom ended in a crash
The 1890s were a whisky boom. New distilleries were built across Speyside and elsewhere, many on borrowed money and optimistic forecasts. In 1898 the Leith blending firm Pattison's collapsed amid fraud. Confidence vanished, prices fell and many distilleries closed in the years that followed.
Meanwhile, French growers found the cure for phylloxera. They grafted European vines onto resistant American rootstocks. The fruit is still vinifera; only the roots are American. Almost every vineyard in the world that has phylloxera in its soil is still planted that way today. Cognac recovered, but Scotch had already won the British drinking habit.
What it means in your glass
The phylloxera story explains why a light blended Scotch with soda became a classic serve. It also explains why so many famous blends date from the late nineteenth century. It also left a quieter legacy: grafting changed which grape varieties were replanted in many regions, including Cognac, where hardier varieties took over from older ones.
Try tasting a blended Scotch and a cognac side by side, both neat, then both with a splash of soda. The brandy shows grape, dried fruit and wood. The blended Scotch shows cereal, vanilla and a lighter body. You can see why one could stand in for the other at a Victorian dinner. Keep the measures to a tasting size and drink water alongside. Our guide to whisky styles is a good next step.
Common questions
What is phylloxera?
A tiny insect native to North America that feeds on grapevine roots. European wine grapes have no resistance, so it killed vast areas of European vineyards in the late nineteenth century.
Did phylloxera create blended Scotch?
No. Blended Scotch already existed thanks to the column still. Phylloxera created a shortage of cognac at a moment when blended Scotch was ready to take its place.
How was phylloxera beaten?
By grafting European vines onto resistant American rootstocks. Most of the world's vineyards are still planted this way.
