A CENTURY and a half ago an alien insect alighted in Europe. It displaced millions, ruined local economies and forced scientists, politicians and ordinary folk into a frenzy of defensive activity. Phylloxera, a member of the group known to entomologists as Hemiptera, or “true” bugs (as opposed to all the other critters known colloquially as bugs), appeared in France in the 1860s and proceeded to eat its way through many of the Old World’s vines…

This article first appeared in The Economist online on 4 July 2020, and in the print edition of 11 July 2020. To continue reading, click here (paywall).