Phylloxera is a microscopic vineyard pest that attacks grapevine roots and contributed to one of the most destructive agricultural crises in wine history. Native to North America, it spread through European vineyards in the nineteenth century, devastating Vitis vinifera vines that had little natural resistance to the insect.
The long-term solution was grafting European grape varieties onto resistant American rootstocks, a practice that reshaped global viticulture. Phylloxera remains significant because it altered vineyard management, changed the economics of wine production, and revealed the vulnerability of even the most established wine regions to biological disruption.